National Toxicology Program

National Toxicology Program
https://ntp.niehs.nih.gov/go/4156

TDMS Study 93023-06 Pathology Tables

NTP Experiment-Test: 93023-06                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09
Study Type: CHRONIC                                           2,4-HEXADIENAL                                      Date: 03/14/01
Route: GAVAGE                                                                                                     Time: 15:02:06

                                                          FINAL#1/RATS




       Facility:  Southern Research Institute

       Chemical CAS #:  142-83-6

       Lock Date:  02/28/00

       Cage Range:  All

       Reasons For Removal:    All

       Removal Date Range:     All

       Treatment Groups:       Include All




































                                                              Page   1


NTP Experiment-Test: 93023-06                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09  
Study Type: CHRONIC                                           2,4-HEXADIENAL                                      Date: 03/14/01    
Route: GAVAGE                                                                                                     Time: 15:02:06    
 _____________________________________________________________________________________________________________________              
                                           | 5| 7| 7| 7| 7| 7| 7| 6| 7| 7| 4| 7| 7| 7| 7| 7| 7| 7| 7| 7| 7| 7| 7| 7| 6|             
                             DAY ON TEST   | 5| 3| 2| 3| 3| 3| 3| 5| 3| 3| 4| 3| 0| 3| 3| 1| 3| 3| 3| 3| 3| 3| 3| 3| 2|             
                                           | 4| 4| 2| 5| 5| 2| 2| 9| 2| 2| 5| 3| 5| 3| 3| 2| 5| 5| 5| 5| 3| 3| 3| 3| 9|             
 __________________________________________|__________________________________________________________________________|             
                                           | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|             
   FISCHER 344 RATS FEMALE                 | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|             
                               ANIMAL ID   | 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2|             
    0                                      | 0| 0| 0| 0| 0| 0| 0| 0| 0| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 2| 2| 2| 2| 2| 2|             
    MG/KG/DY                               | 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5|             
 __________________________________________|__________________________________________________________________________|             
 ALIMENTARY SYSTEM                         |                                                                          |             
                                           |__________________________________________________________________________|             
   Esophagus                               | +  M  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                           |__________________________________________________________________________|             
   Intestine Large, Colon                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                           |__________________________________________________________________________|             
   Intestine Large, Rectum                 | +  +  +  +  I  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                           |__________________________________________________________________________|             
   Intestine Large, Cecum                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                           |__________________________________________________________________________|             
   Intestine Small, Duodenum               | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                           |__________________________________________________________________________|             
   Intestine Small, Jejunum                | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                           |__________________________________________________________________________|             
   Intestine Small, Ileum                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                           |__________________________________________________________________________|             
   Liver                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Angiectasis                          | 3                                                                        |             
      Basophilic Focus                     |    X  X  X  X  X  X  X  X  X  X  X  X  X  X  X  X  X  X  X  X  X  X  X  X|             
      Clear Cell Focus                     |                                  X        X                              |             
      Eosinophilic Focus                   | X                                                        X               |             
      Hepatodiaphragmatic Nodule           |                      X                             X     X               |             
      Infiltration Cellular, Mixed Cell    |    1  1                 1  2              1  3        1                  |             
      Mixed Cell Focus                     |    X                       X                                             |             
      Bile Duct, Hyperplasia               | 2                                   2                                    |             
      Hepatocyte, Cytomegaly               | 3                                                                        |             
      Hepatocyte, Necrosis                 |                                                                   1      |             
      Hepatocyte, Vacuolization Cytoplasmic|                                                                          |             
      Kupffer Cell, Pigmentation           | 3                                            2                           |             
                                           |__________________________________________________________________________|             
   Mesentery                               |                   +  +     +        +                    +     +  +      |             
      Fat, Necrosis                        |                   2  2     3        4                    2     3  3      |             
                                           |__________________________________________________________________________|             
   Oral Mucosa                             |       +                                                                  |             
                                           |__________________________________________________________________________|             
   Pancreas                                | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Atrophy                              |          1                 1                                      3  2   |             
      Cyst                                 |                                                                          |             
      Acinus, Cytoplasmic Alteration       |                                              3                           |             
 __________________________________________|__________________________________________________________________________|             
                                                                                                                                    
                                                                                                                                    
                                                             Page   2                                                               
                                                                                                                                   
NTP Experiment-Test: 93023-06                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09  
Study Type: CHRONIC                                           2,4-HEXADIENAL                                      Date: 03/14/01    
Route: GAVAGE                                                                                                     Time: 15:02:06    
 _____________________________________________________________________________________________________________________              
                                           | 5| 7| 7| 7| 7| 7| 7| 6| 7| 7| 4| 7| 7| 7| 7| 7| 7| 7| 7| 7| 7| 7| 7| 7| 6|             
                             DAY ON TEST   | 5| 3| 2| 3| 3| 3| 3| 5| 3| 3| 4| 3| 0| 3| 3| 1| 3| 3| 3| 3| 3| 3| 3| 3| 2|             
                                           | 4| 4| 2| 5| 5| 2| 2| 9| 2| 2| 5| 3| 5| 3| 3| 2| 5| 5| 5| 5| 3| 3| 3| 3| 9|             
 __________________________________________|__________________________________________________________________________|             
                                           | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|             
   FISCHER 344 RATS FEMALE                 | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|             
                               ANIMAL ID   | 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2|             
    0                                      | 0| 0| 0| 0| 0| 0| 0| 0| 0| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 2| 2| 2| 2| 2| 2|             
    MG/KG/DY                               | 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5|             
 __________________________________________|__________________________________________________________________________|             
 ALIMENTARY SYSTEM - cont                  |                                                                          |             
      Acinus, Hyperplasia, Focal           |                                                                          |             
                                           |__________________________________________________________________________|             
   Salivary Glands                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                           |__________________________________________________________________________|             
   Stomach, Forestomach                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Edema                                |                                                                          |             
      Erosion                              |                                                                          |             
      Ulcer                                |                                     4                                    |             
      Epithelium, Hyperplasia              |                                     3                                    |             
                                           |__________________________________________________________________________|             
   Stomach, Glandular                      | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Edema                                |                                                                          |             
                                           |__________________________________________________________________________|             
   Tongue                                  |                                                          +               |             
      Hyperplasia                          |                                                          4               |             
                                           |__________________________________________________________________________|             
   Tooth                                   |                                                                          |             
 _____________________________________________________________________________________________________________________|             
 CARDIOVASCULAR SYSTEM                     |                                                                          |             
                                           |__________________________________________________________________________|             
   Heart                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Cardiomyopathy                       |       1     1           1  2     1     2  2  2        1        1  1      |             
 _____________________________________________________________________________________________________________________|             
 ENDOCRINE SYSTEM                          |                                                                          |             
                                           |__________________________________________________________________________|             
   Adrenal Cortex                          | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Accessory Adrenal Cortical Nodule    |                3     3                       3        3  3               |             
      Angiectasis                          |                                                                         3|             
      Degeneration, Fatty                  |          3  1                       4  1                 1     3        3|             
      Hyperplasia, Diffuse                 |                                                                         3|             
      Hyperplasia, Focal                   |          3                                         1                     |             
      Hypertrophy, Focal                   |             1  1  1                    2                       3         |             
                                           |__________________________________________________________________________|             
   Adrenal Medulla                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Hyperplasia                          |                                                                          |             
                                           |__________________________________________________________________________|             
   Islets, Pancreatic                      | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Hyperplasia                          |                                                                          |             
 __________________________________________|__________________________________________________________________________|             
                                                                                                                                    
                                                                                                                                    
                                                             Page   3                                                               
                                                                                                                                   
NTP Experiment-Test: 93023-06                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09  
Study Type: CHRONIC                                           2,4-HEXADIENAL                                      Date: 03/14/01    
Route: GAVAGE                                                                                                     Time: 15:02:06    
 _____________________________________________________________________________________________________________________              
                                           | 5| 7| 7| 7| 7| 7| 7| 6| 7| 7| 4| 7| 7| 7| 7| 7| 7| 7| 7| 7| 7| 7| 7| 7| 6|             
                             DAY ON TEST   | 5| 3| 2| 3| 3| 3| 3| 5| 3| 3| 4| 3| 0| 3| 3| 1| 3| 3| 3| 3| 3| 3| 3| 3| 2|             
                                           | 4| 4| 2| 5| 5| 2| 2| 9| 2| 2| 5| 3| 5| 3| 3| 2| 5| 5| 5| 5| 3| 3| 3| 3| 9|             
 __________________________________________|__________________________________________________________________________|             
                                           | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|             
   FISCHER 344 RATS FEMALE                 | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|             
                               ANIMAL ID   | 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2|             
    0                                      | 0| 0| 0| 0| 0| 0| 0| 0| 0| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 2| 2| 2| 2| 2| 2|             
    MG/KG/DY                               | 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5|             
 __________________________________________|__________________________________________________________________________|             
 ENDOCRINE SYSTEM - cont                   |                                                                          |             
                                           |__________________________________________________________________________|             
   Parathyroid Gland                       | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  M  +|             
                                           |__________________________________________________________________________|             
   Pituitary Gland                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Pars Distalis, Angiectasis           | 2        2                       3                 2                 2   |             
      Pars Distalis, Cyst                  | 3           3     3     3  3     3     3  3              3               |             
      Pars Distalis, Hyperplasia, Focal    |    2     2                 3              2        3  2     1  1         |             
                                           |__________________________________________________________________________|             
   Thyroid Gland                           | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      C-Cell, Hyperplasia                  | 1     1     1  1  3  1     2     3  1  1     1     2        1  3        1|             
 _____________________________________________________________________________________________________________________|             
 GENERAL BODY SYSTEM                       |                                                                          |             
                                           |__________________________________________________________________________|             
   Peritoneum                              |                                        +                                 |             
 _____________________________________________________________________________________________________________________|             
 GENITAL SYSTEM                            |                                                                          |             
                                           |__________________________________________________________________________|             
   Clitoral Gland                          | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Cyst                                 |    3     3     3           3     3                                       |             
      Hyperplasia                          |                                                          3               |             
      Inflammation, Chronic                |                                                                          |             
                                           |__________________________________________________________________________|             
   Ovary                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Cyst                                 |       3  4  3     3                                               3  3   |             
                                           |__________________________________________________________________________|             
   Uterus                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Hydrometra                           |                            3                          3                  |             
      Hyperplasia, Cystic                  | 2                                         2                              |             
                                           |__________________________________________________________________________|             
   Vagina                                  |                                     +                                    |             
 _____________________________________________________________________________________________________________________|             
 HEMATOPOIETIC SYSTEM                      |                                                                          |             
                                           |__________________________________________________________________________|             
   Bone Marrow                             | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Hyperplasia                          |       4                                                                  |             
                                           |__________________________________________________________________________|             
   Lymph Node                              | +  +  +  +     +     +        +     +  +        +  +  +     +            |             
      Deep Cervical, Hemorrhage            |                      3                                                   |             
 __________________________________________|__________________________________________________________________________|             
                                                                                                                                    
                                                                                                                                    
                                                             Page   4                                                               
                                                                                                                                   
NTP Experiment-Test: 93023-06                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09  
Study Type: CHRONIC                                           2,4-HEXADIENAL                                      Date: 03/14/01    
Route: GAVAGE                                                                                                     Time: 15:02:06    
 _____________________________________________________________________________________________________________________              
                                           | 5| 7| 7| 7| 7| 7| 7| 6| 7| 7| 4| 7| 7| 7| 7| 7| 7| 7| 7| 7| 7| 7| 7| 7| 6|             
                             DAY ON TEST   | 5| 3| 2| 3| 3| 3| 3| 5| 3| 3| 4| 3| 0| 3| 3| 1| 3| 3| 3| 3| 3| 3| 3| 3| 2|             
                                           | 4| 4| 2| 5| 5| 2| 2| 9| 2| 2| 5| 3| 5| 3| 3| 2| 5| 5| 5| 5| 3| 3| 3| 3| 9|             
 __________________________________________|__________________________________________________________________________|             
                                           | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|             
   FISCHER 344 RATS FEMALE                 | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|             
                               ANIMAL ID   | 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2|             
    0                                      | 0| 0| 0| 0| 0| 0| 0| 0| 0| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 2| 2| 2| 2| 2| 2|             
    MG/KG/DY                               | 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5|             
 __________________________________________|__________________________________________________________________________|             
 HEMATOPOIETIC SYSTEM - cont               |                                                                          |             
      Deep Cervical, Pigmentation          |                      3                                                   |             
      Mediastinal, Hyperplasia, Lymphoid   |    3                                                  2                  |             
      Mediastinal, Pigmentation            |    2                                                                     |             
      Pancreatic, Hemorrhage               |                                                                          |             
      Pancreatic, Hyperplasia, Lymphoid    | 3  2  2  1                          2  1                    2            |             
      Pancreatic, Hyperplasia              |                                                    1                     |             
      Pancreatic, Pigmentation             | 1  3  2  2                    1     2  1        1  2        1            |             
                                           |__________________________________________________________________________|             
   Lymph Node, Mandibular                  | M  M  +  M  M  M  M  M  M  M  +  M  M  +  M  M  M  +  M  M  M  M  M  M  M|             
      Ectasia                              |       3                                            2                     |             
      Hyperplasia, Lymphoid                |       3                                                                  |             
      Pigmentation                         |                                        2           2                     |             
                                           |__________________________________________________________________________|             
   Lymph Node, Mesenteric                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Hemorrhage                           |                      1                             1  2  1           1  1|             
      Hyperplasia, Lymphoid                |                                                                2         |             
      Pigmentation                         | 2  2  2  3  2  3  3  2     2        2        3     3  2  3  2  2  3  3  2|             
                                           |__________________________________________________________________________|             
   Spleen                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Hematopoietic Cell Proliferation     | 3  1  4  2  2           2     2  2     2  2     1  2  1  2     2     2   |             
      Pigmentation                         |    2     2  2        3        2        2  2  3  2  2  2  2        2  2   |             
                                           |__________________________________________________________________________|             
   Thymus                                  | +  +  +  +  +  +  +  +  +  +  +  +  M  +  +  +  +  +  +  +  +  +  +  +  +|             
 _____________________________________________________________________________________________________________________|             
 INTEGUMENTARY SYSTEM                      |                                                                          |             
                                           |__________________________________________________________________________|             
   Mammary Gland                           | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Hyperplasia, Lobular                 |                      3                                                   |             
      Hyperplasia                          | 2  2  3     1  3  3     2  3     4  3  3  3  4  2  3  4  1  2  2     2  4|             
                                           |__________________________________________________________________________|             
   Skin                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  I  +|             
 _____________________________________________________________________________________________________________________|             
 MUSCULOSKELETAL SYSTEM                    |                                                                          |             
                                           |__________________________________________________________________________|             
   Bone                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Femur, Osteopetrosis                 |                                                                          |             
                                           |__________________________________________________________________________|             
   Skeletal Muscle                         |                                     +                                    |             
 __________________________________________|__________________________________________________________________________|             
                                                                                                                                    
                                                                                                                                    
                                                             Page   5                                                               
                                                                                                                                   
NTP Experiment-Test: 93023-06                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09  
Study Type: CHRONIC                                           2,4-HEXADIENAL                                      Date: 03/14/01    
Route: GAVAGE                                                                                                     Time: 15:02:06    
 _____________________________________________________________________________________________________________________              
                                           | 5| 7| 7| 7| 7| 7| 7| 6| 7| 7| 4| 7| 7| 7| 7| 7| 7| 7| 7| 7| 7| 7| 7| 7| 6|             
                             DAY ON TEST   | 5| 3| 2| 3| 3| 3| 3| 5| 3| 3| 4| 3| 0| 3| 3| 1| 3| 3| 3| 3| 3| 3| 3| 3| 2|             
                                           | 4| 4| 2| 5| 5| 2| 2| 9| 2| 2| 5| 3| 5| 3| 3| 2| 5| 5| 5| 5| 3| 3| 3| 3| 9|             
 __________________________________________|__________________________________________________________________________|             
                                           | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|             
   FISCHER 344 RATS FEMALE                 | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|             
                               ANIMAL ID   | 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2|             
    0                                      | 0| 0| 0| 0| 0| 0| 0| 0| 0| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 2| 2| 2| 2| 2| 2|             
    MG/KG/DY                               | 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5|             
 __________________________________________|__________________________________________________________________________|             
 NERVOUS SYSTEM                            |                                                                          |             
                                           |__________________________________________________________________________|             
   Brain                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Compression                          |       2              3              2        4                          2|             
      Hydrocephalus                        |                                              2                           |             
                                           |__________________________________________________________________________|             
   Peripheral Nerve                        |                                     +                                    |             
                                           |__________________________________________________________________________|             
   Spinal Cord                             |                                     +                                    |             
 _____________________________________________________________________________________________________________________|             
 RESPIRATORY SYSTEM                        |                                                                          |             
                                           |__________________________________________________________________________|             
   Lung                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Congestion                           |                                                                          |             
      Infiltration Cellular, Histiocyte    | 1  1  1  1  1  1  2  1  1  1     1        1  1     1  2  2     1  1  2  1|             
      Metaplasia, Osseous                  |                                                                          |             
      Alveolar Epithelium, Hyperplasia     |                                                                          |             
      Alveolar Epithelium, Hyperplasia,    |                                                                          |             
           Multifocal                      |                                                                          |             
                                           |__________________________________________________________________________|             
   Nose                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Foreign Body                         |       X                                                                  |             
      Inflammation, Chronic                |       2                                                                 2|             
      Respiratory Epithelium, Hyperplasia  |       2                                                                 2|             
                                           |__________________________________________________________________________|             
   Trachea                                 | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
 _____________________________________________________________________________________________________________________|             
 SPECIAL SENSES SYSTEM                     |                                                                          |             
                                           |__________________________________________________________________________|             
   Eye                                     |                                                                          |             
      Cataract                             |                                                                          |             
      Retina, Degeneration                 |                                                                          |             
 _____________________________________________________________________________________________________________________|             
 URINARY SYSTEM                            |                                                                          |             
                                           |__________________________________________________________________________|             
   Kidney                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Nephropathy                          | 3                                                                        |             
      Renal Tubule, Cytoplasmic Alteration | 2                    2                                                   |             
      Renal Tubule, Pigmentation           | 2  2                                                                     |             
 __________________________________________|__________________________________________________________________________|             
                                                                                                                                    
                                                                                                                                    
                                                             Page   6                                                               
                                                                                                                                   
NTP Experiment-Test: 93023-06                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09  
Study Type: CHRONIC                                           2,4-HEXADIENAL                                      Date: 03/14/01    
Route: GAVAGE                                                                                                     Time: 15:02:06    
 _____________________________________________________________________________________________________________________              
                                           | 5| 7| 7| 7| 7| 7| 7| 6| 7| 7| 4| 7| 7| 7| 7| 7| 7| 7| 7| 7| 7| 7| 7| 7| 6|             
                             DAY ON TEST   | 5| 3| 2| 3| 3| 3| 3| 5| 3| 3| 4| 3| 0| 3| 3| 1| 3| 3| 3| 3| 3| 3| 3| 3| 2|             
                                           | 4| 4| 2| 5| 5| 2| 2| 9| 2| 2| 5| 3| 5| 3| 3| 2| 5| 5| 5| 5| 3| 3| 3| 3| 9|             
 __________________________________________|__________________________________________________________________________|             
                                           | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|             
   FISCHER 344 RATS FEMALE                 | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|             
                               ANIMAL ID   | 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2|             
    0                                      | 0| 0| 0| 0| 0| 0| 0| 0| 0| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 2| 2| 2| 2| 2| 2|             
    MG/KG/DY                               | 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5|             
 __________________________________________|__________________________________________________________________________|             
 URINARY SYSTEM - cont                     |                                                                          |             
                                           |__________________________________________________________________________|             
   Urinary Bladder                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
 __________________________________________|__________________________________________________________________________              
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                             Page   7                                                               
                                                                                                                                   
NTP Experiment-Test: 93023-06                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09  
Study Type: CHRONIC                                           2,4-HEXADIENAL                                      Date: 03/14/01    
Route: GAVAGE                                                                                                     Time: 15:02:06    
 __________________________________________________________________________________________________________________________________ 
                                           | 2| 7| 7| 7| 7| 7| 7| 7| 7| 7| 7| 5| 7| 7| 7| 6| 7| 7| 7| 7| 7| 5| 7| 7| 7|            |
                             DAY ON TEST   | 8| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 1| 2| 3| 3| 6| 3| 3| 3| 0| 3| 6| 3| 3| 3|            |
                                           | 5| 3| 3| 3| 3| 3| 3| 3| 3| 3| 2| 1| 7| 2| 2| 4| 3| 3| 3| 4| 4| 0| 4| 4| 4|            |
 __________________________________________|__________________________________________________________________________|      T (*) |
                                           | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|      O     |
   FISCHER 344 RATS FEMALE                 | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|      T     |
                               ANIMAL ID   | 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2|      A     |
    0                                      | 2| 2| 2| 2| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 5|      L     |
    MG/KG/DY                               | 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0|            |
 _____________________________________________________________________________________________________________________|____________|
 ALIMENTARY SYSTEM                         |                                                                          |            |
                                           |__________________________________________________________________________|____________|
   Esophagus                               | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  M  +  +|  48        |
                                           |__________________________________________________________________________|____________|
   Intestine Large, Colon                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
                                           |__________________________________________________________________________|____________|
   Intestine Large, Rectum                 | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  49        |
                                           |__________________________________________________________________________|____________|
   Intestine Large, Cecum                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
                                           |__________________________________________________________________________|____________|
   Intestine Small, Duodenum               | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
                                           |__________________________________________________________________________|____________|
   Intestine Small, Jejunum                | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
                                           |__________________________________________________________________________|____________|
   Intestine Small, Ileum                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
                                           |__________________________________________________________________________|____________|
   Liver                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Angiectasis                          |                                                                          |      1  3.0|
      Basophilic Focus                     |    X  X  X  X  X  X  X  X  X  X  X  X  X  X  X  X  X  X  X  X     X  X  X|     47     |
      Clear Cell Focus                     |             X  X           X                                         X  X|      7     |
      Eosinophilic Focus                   |    X     X  X  X        X                                   X        X   |      9     |
      Hepatodiaphragmatic Nodule           |                         X     X              X                 X  X     X|      9     |
      Infiltration Cellular, Mixed Cell    |                   1              2  3  3  2        1           2  1      |     15  1.7|
      Mixed Cell Focus                     |       X              X  X                                               X|      6     |
      Bile Duct, Hyperplasia               |                                     1  2                 1               |      5  1.6|
      Hepatocyte, Cytomegaly               |                                                          2               |      2  2.5|
      Hepatocyte, Necrosis                 |                                                                         2|      2  1.5|
      Hepatocyte, Vacuolization Cytoplasmic|                                                          3               |      1  3.0|
      Kupffer Cell, Pigmentation           |                                                                          |      2  2.5|
                                           |__________________________________________________________________________|____________|
   Mesentery                               |             +  +     +           +                       +        +      |  13        |
      Fat, Necrosis                        |             3  3     4           3                       2        3      |     13  2.8|
                                           |__________________________________________________________________________|____________|
   Oral Mucosa                             |                                                                          |   1        |
                                           |__________________________________________________________________________|____________|
 _____________________________________________________________________________________________________________________|____________|
                                                                                                                                    
  * : Total animals with tissue examined microscopically; total animals with lesion and mean severity grade                         
  + : Tissue examined microscopically                M : Missing tissue                        1-4 : Lesion qualified as:           
  X : Lesion present but not qualified               A : Autolysis precludes examination               1) Minimal  3) Moderate      
  I : Insufficient tissue                        BLANK : Not examined                                  2) Mild     4) Marked        
                                                                                                                                    
                                                             Page   8                                                               
                                                                                                                                   
NTP Experiment-Test: 93023-06                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09  
Study Type: CHRONIC                                           2,4-HEXADIENAL                                      Date: 03/14/01    
Route: GAVAGE                                                                                                     Time: 15:02:06    
 __________________________________________________________________________________________________________________________________ 
                                           | 2| 7| 7| 7| 7| 7| 7| 7| 7| 7| 7| 5| 7| 7| 7| 6| 7| 7| 7| 7| 7| 5| 7| 7| 7|            |
                             DAY ON TEST   | 8| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 1| 2| 3| 3| 6| 3| 3| 3| 0| 3| 6| 3| 3| 3|            |
                                           | 5| 3| 3| 3| 3| 3| 3| 3| 3| 3| 2| 1| 7| 2| 2| 4| 3| 3| 3| 4| 4| 0| 4| 4| 4|            |
 __________________________________________|__________________________________________________________________________|      T (*) |
                                           | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|      O     |
   FISCHER 344 RATS FEMALE                 | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|      T     |
                               ANIMAL ID   | 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2|      A     |
    0                                      | 2| 2| 2| 2| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 5|      L     |
    MG/KG/DY                               | 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0|            |
 _____________________________________________________________________________________________________________________|____________|
 ALIMENTARY SYSTEM - cont                  |                                                                          |            |
   Pancreas                                | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Atrophy                              |    3     1                                      2                        |      7  1.9|
      Cyst                                 |          3        3                                                      |      2  3.0|
      Acinus, Cytoplasmic Alteration       |                                                                          |      1  3.0|
      Acinus, Hyperplasia, Focal           |                2        2                             2                  |      3  2.0|
                                           |__________________________________________________________________________|____________|
   Salivary Glands                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
                                           |__________________________________________________________________________|____________|
   Stomach, Forestomach                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Edema                                | 3                                                                        |      1  3.0|
      Erosion                              | 2                                                                        |      1  2.0|
      Ulcer                                |                                                                          |      1  4.0|
      Epithelium, Hyperplasia              | 3                                                                        |      2  3.0|
                                           |__________________________________________________________________________|____________|
   Stomach, Glandular                      | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Edema                                |                                     2                                    |      1  2.0|
                                           |__________________________________________________________________________|____________|
   Tongue                                  |                                                                          |   1        |
      Hyperplasia                          |                                                                          |      1  4.0|
                                           |__________________________________________________________________________|____________|
   Tooth                                   | +                                                                        |   1        |
 _____________________________________________________________________________________________________________________|            |
 CARDIOVASCULAR SYSTEM                     |                                                                          |            |
                                           |__________________________________________________________________________|____________|
   Heart                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Cardiomyopathy                       |    1  1     1  2                    2           1     1  2  2            |     20  1.4|
 _____________________________________________________________________________________________________________________|            |
 ENDOCRINE SYSTEM                          |                                                                          |            |
                                           |__________________________________________________________________________|____________|
   Adrenal Cortex                          | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Accessory Adrenal Cortical Nodule    |       3     3  3  3                    3  3  3                          3|     13  3.0|
      Angiectasis                          |                      3                    3                              |      3  3.0|
      Degeneration, Fatty                  |                4  3  4                       2                       2   |     12  2.6|
      Hyperplasia, Diffuse                 |                                                          3               |      2  3.0|
 _____________________________________________________________________________________________________________________|____________|
                                                                                                                                    
  * : Total animals with tissue examined microscopically; total animals with lesion and mean severity grade                         
  + : Tissue examined microscopically                M : Missing tissue                        1-4 : Lesion qualified as:           
  X : Lesion present but not qualified               A : Autolysis precludes examination               1) Minimal  3) Moderate      
  I : Insufficient tissue                        BLANK : Not examined                                  2) Mild     4) Marked        
                                                                                                                                    
                                                             Page   9                                                               
                                                                                                                                   
NTP Experiment-Test: 93023-06                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09  
Study Type: CHRONIC                                           2,4-HEXADIENAL                                      Date: 03/14/01    
Route: GAVAGE                                                                                                     Time: 15:02:06    
 __________________________________________________________________________________________________________________________________ 
                                           | 2| 7| 7| 7| 7| 7| 7| 7| 7| 7| 7| 5| 7| 7| 7| 6| 7| 7| 7| 7| 7| 5| 7| 7| 7|            |
                             DAY ON TEST   | 8| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 1| 2| 3| 3| 6| 3| 3| 3| 0| 3| 6| 3| 3| 3|            |
                                           | 5| 3| 3| 3| 3| 3| 3| 3| 3| 3| 2| 1| 7| 2| 2| 4| 3| 3| 3| 4| 4| 0| 4| 4| 4|            |
 __________________________________________|__________________________________________________________________________|      T (*) |
                                           | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|      O     |
   FISCHER 344 RATS FEMALE                 | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|      T     |
                               ANIMAL ID   | 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2|      A     |
    0                                      | 2| 2| 2| 2| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 5|      L     |
    MG/KG/DY                               | 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0|            |
 _____________________________________________________________________________________________________________________|____________|
 ENDOCRINE SYSTEM - cont                   |                                                                          |            |
      Hyperplasia, Focal                   |                                              4                           |      3  2.7|
      Hypertrophy, Focal                   |                   2  3                                3              2   |      9  2.0|
                                           |__________________________________________________________________________|____________|
   Adrenal Medulla                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Hyperplasia                          |       1        2                                         1               |      3  1.3|
                                           |__________________________________________________________________________|____________|
   Islets, Pancreatic                      | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Hyperplasia                          |                                                       1                  |      1  1.0|
                                           |__________________________________________________________________________|____________|
   Parathyroid Gland                       | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  49        |
                                           |__________________________________________________________________________|____________|
   Pituitary Gland                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Pars Distalis, Angiectasis           |                3  3           2        3                                 |      9  2.4|
      Pars Distalis, Cyst                  |       3     3     3  3  3     3     3  3  3  3  3  3  3                  |     22  3.0|
      Pars Distalis, Hyperplasia, Focal    |          1                    2     2  3                                1|     13  1.9|
                                           |__________________________________________________________________________|____________|
   Thyroid Gland                           | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      C-Cell, Hyperplasia                  |    3           2  1           2     3  1  1     2                 1      |     24  1.6|
 _____________________________________________________________________________________________________________________|            |
 GENERAL BODY SYSTEM                       |                                                                          |            |
                                           |__________________________________________________________________________|____________|
   Peritoneum                              |                                                                          |   1        |
 _____________________________________________________________________________________________________________________|            |
 GENITAL SYSTEM                            |                                                                          |            |
                                           |__________________________________________________________________________|____________|
   Clitoral Gland                          | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Cyst                                 |             3                             3                          3   |      8  3.0|
      Hyperplasia                          |                                                                          |      1  3.0|
      Inflammation, Chronic                |             3                                                            |      1  3.0|
                                           |__________________________________________________________________________|____________|
   Ovary                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Cyst                                 |    4  3                 3     3           3           3                  |     12  3.2|
                                           |__________________________________________________________________________|____________|
   Uterus                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
 _____________________________________________________________________________________________________________________|____________|
                                                                                                                                    
  * : Total animals with tissue examined microscopically; total animals with lesion and mean severity grade                         
  + : Tissue examined microscopically                M : Missing tissue                        1-4 : Lesion qualified as:           
  X : Lesion present but not qualified               A : Autolysis precludes examination               1) Minimal  3) Moderate      
  I : Insufficient tissue                        BLANK : Not examined                                  2) Mild     4) Marked        
                                                                                                                                    
                                                             Page  10                                                               
                                                                                                                                   
NTP Experiment-Test: 93023-06                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09  
Study Type: CHRONIC                                           2,4-HEXADIENAL                                      Date: 03/14/01    
Route: GAVAGE                                                                                                     Time: 15:02:06    
 __________________________________________________________________________________________________________________________________ 
                                           | 2| 7| 7| 7| 7| 7| 7| 7| 7| 7| 7| 5| 7| 7| 7| 6| 7| 7| 7| 7| 7| 5| 7| 7| 7|            |
                             DAY ON TEST   | 8| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 1| 2| 3| 3| 6| 3| 3| 3| 0| 3| 6| 3| 3| 3|            |
                                           | 5| 3| 3| 3| 3| 3| 3| 3| 3| 3| 2| 1| 7| 2| 2| 4| 3| 3| 3| 4| 4| 0| 4| 4| 4|            |
 __________________________________________|__________________________________________________________________________|      T (*) |
                                           | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|      O     |
   FISCHER 344 RATS FEMALE                 | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|      T     |
                               ANIMAL ID   | 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2|      A     |
    0                                      | 2| 2| 2| 2| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 5|      L     |
    MG/KG/DY                               | 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0|            |
 _____________________________________________________________________________________________________________________|____________|
 GENITAL SYSTEM - cont                     |                                                                          |            |
      Hydrometra                           |                                                                          |      2  3.0|
      Hyperplasia, Cystic                  |                                                                      2   |      3  2.0|
                                           |__________________________________________________________________________|____________|
   Vagina                                  |                                                                          |   1        |
 _____________________________________________________________________________________________________________________|            |
 HEMATOPOIETIC SYSTEM                      |                                                                          |            |
                                           |__________________________________________________________________________|____________|
   Bone Marrow                             | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Hyperplasia                          |                                                          2               |      2  3.0|
                                           |__________________________________________________________________________|____________|
   Lymph Node                              |       +  +  +     +  +  +  +  M     +  +  +     +  +     +     +  +     +|  29        |
      Deep Cervical, Hemorrhage            |                                                                          |      1  3.0|
      Deep Cervical, Pigmentation          |                                                                          |      1  3.0|
      Mediastinal, Hyperplasia, Lymphoid   |       2  2                                               2               |      5  2.2|
      Mediastinal, Pigmentation            |       2  2                                                     2         |      4  2.0|
      Pancreatic, Hemorrhage               |          1        1  1  2  2                       1     3     2         |      8  1.6|
      Pancreatic, Hyperplasia, Lymphoid    |       3     3     3     2  3                    2  1     2     2        3|     17  2.2|
      Pancreatic, Hyperplasia              |                                                                          |      1  1.0|
      Pancreatic, Pigmentation             |       2  1  1     1  2  3  1              1     1  3     2     1  2     1|     24  1.6|
                                           |__________________________________________________________________________|____________|
   Lymph Node, Mandibular                  | +  M  M  M  M  M  M  M  M  M  M  M  M  M  M  M  M  M  M  M  M  M  M  +  M|   6        |
      Ectasia                              |                                                                          |      2  2.5|
      Hyperplasia, Lymphoid                |                                                                          |      1  3.0|
      Pigmentation                         | 2                                                                        |      3  2.0|
                                           |__________________________________________________________________________|____________|
   Lymph Node, Mesenteric                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Hemorrhage                           | 2     1           1                                               1      |     10  1.2|
      Hyperplasia, Lymphoid                | 2     2                          2                    2  3     2  2     2|      9  2.1|
      Pigmentation                         | 2  4  2  2  3  3  2  3  3  2  2  2        2  3  3  3  3  3  2  2  2  2  3|     42  2.5|
                                           |__________________________________________________________________________|____________|
   Spleen                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Hematopoietic Cell Proliferation     |    2     2  2  2  2     2  2  1           1  2  3  1  1  3  1     1  1  1|     34  1.8|
      Pigmentation                         |       2  2  2  2  2  3  2  2     3        2        2  2  2     3  3      |     29  2.2|
                                           |__________________________________________________________________________|____________|
 _____________________________________________________________________________________________________________________|____________|
                                                                                                                                    
  * : Total animals with tissue examined microscopically; total animals with lesion and mean severity grade                         
  + : Tissue examined microscopically                M : Missing tissue                        1-4 : Lesion qualified as:           
  X : Lesion present but not qualified               A : Autolysis precludes examination               1) Minimal  3) Moderate      
  I : Insufficient tissue                        BLANK : Not examined                                  2) Mild     4) Marked        
                                                                                                                                    
                                                             Page  11                                                               
                                                                                                                                   
NTP Experiment-Test: 93023-06                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09  
Study Type: CHRONIC                                           2,4-HEXADIENAL                                      Date: 03/14/01    
Route: GAVAGE                                                                                                     Time: 15:02:06    
 __________________________________________________________________________________________________________________________________ 
                                           | 2| 7| 7| 7| 7| 7| 7| 7| 7| 7| 7| 5| 7| 7| 7| 6| 7| 7| 7| 7| 7| 5| 7| 7| 7|            |
                             DAY ON TEST   | 8| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 1| 2| 3| 3| 6| 3| 3| 3| 0| 3| 6| 3| 3| 3|            |
                                           | 5| 3| 3| 3| 3| 3| 3| 3| 3| 3| 2| 1| 7| 2| 2| 4| 3| 3| 3| 4| 4| 0| 4| 4| 4|            |
 __________________________________________|__________________________________________________________________________|      T (*) |
                                           | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|      O     |
   FISCHER 344 RATS FEMALE                 | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|      T     |
                               ANIMAL ID   | 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2|      A     |
    0                                      | 2| 2| 2| 2| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 5|      L     |
    MG/KG/DY                               | 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0|            |
 _____________________________________________________________________________________________________________________|____________|
 HEMATOPOIETIC SYSTEM - cont               |                                                                          |            |
   Thymus                                  | +  +  +  +  +  I  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  48        |
 _____________________________________________________________________________________________________________________|            |
 INTEGUMENTARY SYSTEM                      |                                                                          |            |
                                           |__________________________________________________________________________|____________|
   Mammary Gland                           | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Hyperplasia, Lobular                 |                   2                                                      |      2  2.5|
      Hyperplasia                          |    3  2  3  3  3  3  3  3  3  3     3  4  3  2  3  2  2  4     4  4  2  2|     43  2.8|
                                           |__________________________________________________________________________|____________|
   Skin                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  49        |
 _____________________________________________________________________________________________________________________|            |
 MUSCULOSKELETAL SYSTEM                    |                                                                          |            |
                                           |__________________________________________________________________________|____________|
   Bone                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Femur, Osteopetrosis                 |                   2                 2                                    |      2  2.0|
                                           |__________________________________________________________________________|____________|
   Skeletal Muscle                         |                                  +                                       |   2        |
 _____________________________________________________________________________________________________________________|            |
 NERVOUS SYSTEM                            |                                                                          |            |
                                           |__________________________________________________________________________|____________|
   Brain                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Compression                          |                                                                4  4      |      7  3.0|
      Hydrocephalus                        |                                                                3  2      |      3  2.3|
                                           |__________________________________________________________________________|____________|
   Peripheral Nerve                        |       +                                                                  |   2        |
                                           |__________________________________________________________________________|____________|
   Spinal Cord                             |       +                          +                                       |   3        |
 _____________________________________________________________________________________________________________________|            |
 RESPIRATORY SYSTEM                        |                                                                          |            |
                                           |__________________________________________________________________________|____________|
   Lung                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Congestion                           |                                                          3               |      1  3.0|
      Infiltration Cellular, Histiocyte    |    2  1  2  2     1  2  2  1  1        2  2  1  1  1  2  1  3  1  1  2  3|     41  1.4|
      Metaplasia, Osseous                  |                                                                      1   |      1  1.0|
      Alveolar Epithelium, Hyperplasia     |                            1                                      1      |      2  1.0|
 _____________________________________________________________________________________________________________________|____________|
                                                                                                                                    
  * : Total animals with tissue examined microscopically; total animals with lesion and mean severity grade                         
  + : Tissue examined microscopically                M : Missing tissue                        1-4 : Lesion qualified as:           
  X : Lesion present but not qualified               A : Autolysis precludes examination               1) Minimal  3) Moderate      
  I : Insufficient tissue                        BLANK : Not examined                                  2) Mild     4) Marked        
                                                                                                                                    
                                                             Page  12                                                               
                                                                                                                                   
NTP Experiment-Test: 93023-06                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09  
Study Type: CHRONIC                                           2,4-HEXADIENAL                                      Date: 03/14/01    
Route: GAVAGE                                                                                                     Time: 15:02:06    
 __________________________________________________________________________________________________________________________________ 
                                           | 2| 7| 7| 7| 7| 7| 7| 7| 7| 7| 7| 5| 7| 7| 7| 6| 7| 7| 7| 7| 7| 5| 7| 7| 7|            |
                             DAY ON TEST   | 8| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 1| 2| 3| 3| 6| 3| 3| 3| 0| 3| 6| 3| 3| 3|            |
                                           | 5| 3| 3| 3| 3| 3| 3| 3| 3| 3| 2| 1| 7| 2| 2| 4| 3| 3| 3| 4| 4| 0| 4| 4| 4|            |
 __________________________________________|__________________________________________________________________________|      T (*) |
                                           | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|      O     |
   FISCHER 344 RATS FEMALE                 | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|      T     |
                               ANIMAL ID   | 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2|      A     |
    0                                      | 2| 2| 2| 2| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 5|      L     |
    MG/KG/DY                               | 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0|            |
 _____________________________________________________________________________________________________________________|____________|
 RESPIRATORY SYSTEM - cont                 |                                                                          |            |
      Alveolar Epithelium, Hyperplasia,    |                                                                          |            |
           Multifocal                      |                                     3                                    |      1  3.0|
                                           |__________________________________________________________________________|____________|
   Nose                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Foreign Body                         |                                                                X         |      2     |
      Inflammation, Chronic                |                                     2                          2         |      4  2.0|
      Respiratory Epithelium, Hyperplasia  |                                                                2         |      3  2.0|
                                           |__________________________________________________________________________|____________|
   Trachea                                 | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
 _____________________________________________________________________________________________________________________|            |
 SPECIAL SENSES SYSTEM                     |                                                                          |            |
                                           |__________________________________________________________________________|____________|
   Eye                                     |                                           +                              |   1        |
      Cataract                             |                                           3                              |      1  3.0|
      Retina, Degeneration                 |                                           4                              |      1  4.0|
 _____________________________________________________________________________________________________________________|            |
 URINARY SYSTEM                            |                                                                          |            |
                                           |__________________________________________________________________________|____________|
   Kidney                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Nephropathy                          |                                                          2               |      2  2.5|
      Renal Tubule, Cytoplasmic Alteration |                                                                   2      |      3  2.0|
      Renal Tubule, Pigmentation           |                                     2              2                     |      4  2.0|
                                           |__________________________________________________________________________|____________|
   Urinary Bladder                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
 __________________________________________________________________________________________________________________________________ 
                                                                                                                                    
  * : Total animals with tissue examined microscopically; total animals with lesion and mean severity grade                         
  + : Tissue examined microscopically                M : Missing tissue                        1-4 : Lesion qualified as:           
  X : Lesion present but not qualified               A : Autolysis precludes examination               1) Minimal  3) Moderate      
  I : Insufficient tissue                        BLANK : Not examined                                  2) Mild     4) Marked        
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                             Page  13                                                               
                                                                                                                                   
NTP Experiment-Test: 93023-06                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09  
Study Type: CHRONIC                                           2,4-HEXADIENAL                                      Date: 03/14/01    
Route: GAVAGE                                                                                                     Time: 15:02:06    
 _____________________________________________________________________________________________________________________              
                                           | 7| 6| 7| 7| 3| 7| 7| 7| 7| 7| 7| 7| 7| 7| 7| 7| 7| 6| 7| 7| 7| 7| 7| 7| 7|             
                             DAY ON TEST   | 3| 7| 2| 3| 4| 3| 3| 3| 1| 3| 3| 3| 3| 3| 3| 3| 1| 2| 3| 3| 3| 3| 3| 3| 3|             
                                           | 3| 1| 9| 3| 7| 4| 4| 4| 9| 4| 4| 4| 4| 4| 4| 2| 9| 9| 2| 2| 3| 3| 3| 3| 3|             
 __________________________________________|__________________________________________________________________________|             
                                           | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|             
   FISCHER 344 RATS FEMALE                 | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|             
                               ANIMAL ID   | 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2|             
    22.5                                   | 5| 5| 5| 5| 5| 5| 5| 5| 5| 6| 6| 6| 6| 6| 6| 6| 6| 6| 6| 7| 7| 7| 7| 7| 7|             
    MG/KG/DY                               | 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5|             
 __________________________________________|__________________________________________________________________________|             
 ALIMENTARY SYSTEM                         |                                                                          |             
                                           |__________________________________________________________________________|             
   Esophagus                               | +  +  +  +  +  +  +  +  +  +  M  +  +  +  I  +  +  +  +  +  +  +  +  +  +|             
                                           |__________________________________________________________________________|             
   Intestine Large, Colon                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                           |__________________________________________________________________________|             
   Intestine Large, Rectum                 | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                           |__________________________________________________________________________|             
   Intestine Large, Cecum                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Edema                                |    3                                                                     |             
      Inflammation, Chronic Active         |    3                                                                     |             
                                           |__________________________________________________________________________|             
   Intestine Small, Duodenum               | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                           |__________________________________________________________________________|             
   Intestine Small, Jejunum                | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                           |__________________________________________________________________________|             
   Intestine Small, Ileum                  | +  +  M  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                           |__________________________________________________________________________|             
   Liver                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Angiectasis                          |                                                                          |             
      Basophilic Focus                     | X  X  X  X  X  X  X  X  X  X  X  X  X  X  X  X     X  X  X  X  X  X  X  X|             
      Clear Cell Focus                     |                               X     X                                   X|             
      Eosinophilic Focus                   |       X                                X        X        X               |             
      Hepatodiaphragmatic Nodule           |          X                    X  X                                      X|             
      Infiltration Cellular, Mixed Cell    |          2                                            1        2        1|             
      Mixed Cell Focus                     |          X     X  X                                               X  X  X|             
      Hepatocyte, Vacuolization Cytoplasmic|                         2                       3     3                  |             
      Kupffer Cell, Pigmentation           |                         3                                                |             
                                           |__________________________________________________________________________|             
   Mesentery                               |                   +  +     +     +     +  +     +        +               |             
      Fat, Necrosis                        |                   3  4     3     3     4  2     3        3               |             
                                           |__________________________________________________________________________|             
   Pancreas                                | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Atrophy                              | 1                       1              1           2  2           1     2|             
      Cyst                                 |       3           3  3                                                   |             
      Acinus, Cytoplasmic Alteration       |                                                 3  3                     |             
      Acinus, Hyperplasia, Focal           |                                                          2           1   |             
                                           |__________________________________________________________________________|             
   Salivary Glands                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
 __________________________________________|__________________________________________________________________________|             
                                                                                                                                    
                                                                                                                                    
                                                             Page  14                                                               
                                                                                                                                   
NTP Experiment-Test: 93023-06                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09  
Study Type: CHRONIC                                           2,4-HEXADIENAL                                      Date: 03/14/01    
Route: GAVAGE                                                                                                     Time: 15:02:06    
 _____________________________________________________________________________________________________________________              
                                           | 7| 6| 7| 7| 3| 7| 7| 7| 7| 7| 7| 7| 7| 7| 7| 7| 7| 6| 7| 7| 7| 7| 7| 7| 7|             
                             DAY ON TEST   | 3| 7| 2| 3| 4| 3| 3| 3| 1| 3| 3| 3| 3| 3| 3| 3| 1| 2| 3| 3| 3| 3| 3| 3| 3|             
                                           | 3| 1| 9| 3| 7| 4| 4| 4| 9| 4| 4| 4| 4| 4| 4| 2| 9| 9| 2| 2| 3| 3| 3| 3| 3|             
 __________________________________________|__________________________________________________________________________|             
                                           | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|             
   FISCHER 344 RATS FEMALE                 | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|             
                               ANIMAL ID   | 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2|             
    22.5                                   | 5| 5| 5| 5| 5| 5| 5| 5| 5| 6| 6| 6| 6| 6| 6| 6| 6| 6| 6| 7| 7| 7| 7| 7| 7|             
    MG/KG/DY                               | 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5|             
 __________________________________________|__________________________________________________________________________|             
 ALIMENTARY SYSTEM - cont                  |                                                                          |             
      Atrophy                              |    2                                                                     |             
      Necrosis                             |          4                                                               |             
                                           |__________________________________________________________________________|             
   Stomach, Forestomach                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  M  +  +  +  +  +|             
      Edema                                |                                                 4                        |             
      Epithelium, Hyperplasia              | 1  2     1     1  1              1     1              1                  |             
                                           |__________________________________________________________________________|             
   Stomach, Glandular                      | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  M  +  +  +  +  +|             
 _____________________________________________________________________________________________________________________|             
 CARDIOVASCULAR SYSTEM                     |                                                                          |             
                                           |__________________________________________________________________________|             
   Heart                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Cardiomyopathy                       | 1                    1  3              2                 1  2        1  1|             
      Myocardium, Necrosis                 |    3                                                                     |             
 _____________________________________________________________________________________________________________________|             
 ENDOCRINE SYSTEM                          |                                                                          |             
                                           |__________________________________________________________________________|             
   Adrenal Cortex                          | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Accessory Adrenal Cortical Nodule    | 3                 3              3     3        3     3  3     3         |             
      Angiectasis                          |                                                                      2   |             
      Degeneration, Fatty                  |    3                          1  3     2                    1            |             
      Hyperplasia, Focal                   |       2              1                 4     1                           |             
      Hypertrophy, Focal                   |    3                             3              1                        |             
                                           |__________________________________________________________________________|             
   Adrenal Medulla                         | +  +  +  +  +  +  M  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Hyperplasia                          |                                                                          |             
                                           |__________________________________________________________________________|             
   Islets, Pancreatic                      | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Hyperplasia                          |                                  3                                       |             
                                           |__________________________________________________________________________|             
   Parathyroid Gland                       | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  M  +  +  M  +  +  +  +  +  +|             
                                           |__________________________________________________________________________|             
   Pituitary Gland                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Pars Distalis, Angiectasis           |                         2                                                |             
      Pars Distalis, Cyst                  |    3                 3        3     3                 3        3  3  3   |             
      Pars Distalis, Hyperplasia, Focal    |    3                    3              2  3                             2|             
      Pars Distalis, Hyperplasia           |                      2                 2     2                           |             
      Pars Intermedia, Cyst                |                         3                                                |             
 __________________________________________|__________________________________________________________________________|             
                                                                                                                                    
                                                                                                                                    
                                                             Page  15                                                               
                                                                                                                                   
NTP Experiment-Test: 93023-06                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09  
Study Type: CHRONIC                                           2,4-HEXADIENAL                                      Date: 03/14/01    
Route: GAVAGE                                                                                                     Time: 15:02:06    
 _____________________________________________________________________________________________________________________              
                                           | 7| 6| 7| 7| 3| 7| 7| 7| 7| 7| 7| 7| 7| 7| 7| 7| 7| 6| 7| 7| 7| 7| 7| 7| 7|             
                             DAY ON TEST   | 3| 7| 2| 3| 4| 3| 3| 3| 1| 3| 3| 3| 3| 3| 3| 3| 1| 2| 3| 3| 3| 3| 3| 3| 3|             
                                           | 3| 1| 9| 3| 7| 4| 4| 4| 9| 4| 4| 4| 4| 4| 4| 2| 9| 9| 2| 2| 3| 3| 3| 3| 3|             
 __________________________________________|__________________________________________________________________________|             
                                           | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|             
   FISCHER 344 RATS FEMALE                 | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|             
                               ANIMAL ID   | 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2|             
    22.5                                   | 5| 5| 5| 5| 5| 5| 5| 5| 5| 6| 6| 6| 6| 6| 6| 6| 6| 6| 6| 7| 7| 7| 7| 7| 7|             
    MG/KG/DY                               | 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5|             
 __________________________________________|__________________________________________________________________________|             
 ENDOCRINE SYSTEM - cont                   |                                                                          |             
                                           |__________________________________________________________________________|             
   Thyroid Gland                           | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Ultimobranchial Cyst                 |                                                                          |             
      C-Cell, Hyperplasia                  | 1                 1     1  1           1        1        1        1  1   |             
      Follicle, Cyst                       |                                                                          |             
 _____________________________________________________________________________________________________________________|             
 GENERAL BODY SYSTEM                       |                                                                          |             
    None                                   |                                                                          |             
 _____________________________________________________________________________________________________________________|             
 GENITAL SYSTEM                            |                                                                          |             
                                           |__________________________________________________________________________|             
   Clitoral Gland                          | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Cyst                                 |                   3                                3     3              3|             
      Inflammation, Chronic                |                                           2        2                     |             
                                           |__________________________________________________________________________|             
   Ovary                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Cyst                                 |       3        4                             3                          4|             
                                           |__________________________________________________________________________|             
   Uterus                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Hydrometra                           | 2                                3     3                       3  3      |             
      Hyperplasia, Cystic                  |                                              1  3                        |             
                                           |__________________________________________________________________________|             
   Vagina                                  |    +                                            +                        |             
 _____________________________________________________________________________________________________________________|             
 HEMATOPOIETIC SYSTEM                      |                                                                          |             
                                           |__________________________________________________________________________|             
   Bone Marrow                             | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Hyperplasia                          |          2                       2              2                        |             
      Infiltration Cellular, Histiocyte    |                                                                      4   |             
                                           |__________________________________________________________________________|             
   Lymph Node                              |    +                    +  +  +        +  +     +  +  +  +  +  +  +     +|             
      Deep Cervical, Hemorrhage            |                                                       3                  |             
      Deep Cervical, Pigmentation          |                                                       3                  |             
      Mediastinal, Hemorrhage              |                            3           1                                 |             
      Mediastinal, Hyperplasia, Lymphoid   |                            3           3              2     3            |             
      Mediastinal, Pigmentation            |                            3           2           2  2     3            |             
      Pancreatic, Hemorrhage               |                               1                          2              2|             
      Pancreatic, Hyperplasia, Lymphoid    |    1                    2     1           2     3     3  1     3  1     1|             
 __________________________________________|__________________________________________________________________________|             
                                                                                                                                    
                                                                                                                                    
                                                             Page  16                                                               
                                                                                                                                   
NTP Experiment-Test: 93023-06                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09  
Study Type: CHRONIC                                           2,4-HEXADIENAL                                      Date: 03/14/01    
Route: GAVAGE                                                                                                     Time: 15:02:06    
 _____________________________________________________________________________________________________________________              
                                           | 7| 6| 7| 7| 3| 7| 7| 7| 7| 7| 7| 7| 7| 7| 7| 7| 7| 6| 7| 7| 7| 7| 7| 7| 7|             
                             DAY ON TEST   | 3| 7| 2| 3| 4| 3| 3| 3| 1| 3| 3| 3| 3| 3| 3| 3| 1| 2| 3| 3| 3| 3| 3| 3| 3|             
                                           | 3| 1| 9| 3| 7| 4| 4| 4| 9| 4| 4| 4| 4| 4| 4| 2| 9| 9| 2| 2| 3| 3| 3| 3| 3|             
 __________________________________________|__________________________________________________________________________|             
                                           | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|             
   FISCHER 344 RATS FEMALE                 | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|             
                               ANIMAL ID   | 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2|             
    22.5                                   | 5| 5| 5| 5| 5| 5| 5| 5| 5| 6| 6| 6| 6| 6| 6| 6| 6| 6| 6| 7| 7| 7| 7| 7| 7|             
    MG/KG/DY                               | 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5|             
 __________________________________________|__________________________________________________________________________|             
 HEMATOPOIETIC SYSTEM - cont               |                                                                          |             
      Pancreatic, Pigmentation             |    2                    1     2           1     1     2  2     1  2     2|             
                                           |__________________________________________________________________________|             
   Lymph Node, Mandibular                  | M  M  M  M  M  M  M  M  M  M  M  M  M  M  M  M  M  M  M  M  +  M  M  M  M|             
      Ectasia                              |                                                             3            |             
      Pigmentation                         |                                                                          |             
                                           |__________________________________________________________________________|             
   Lymph Node, Mesenteric                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Hemorrhage                           |                                                    2  1                  |             
      Hyperplasia, Lymphoid                |             3              2     3           2        2  2               |             
      Pigmentation                         |    2  3        3  3  3  2  3  3  3  2  3  2  2  3  2  3  2     3  2  3  2|             
                                           |__________________________________________________________________________|             
   Spleen                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Hematopoietic Cell Proliferation     | 2        2     2  2     3     2              1        2  2  2        2   |             
      Pigmentation                         | 3     2     3  2  2        2  2     3  3  2  2  3  3     2  2  2     2  2|             
                                           |__________________________________________________________________________|             
   Thymus                                  | +  +  +  M  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
 _____________________________________________________________________________________________________________________|             
 INTEGUMENTARY SYSTEM                      |                                                                          |             
                                           |__________________________________________________________________________|             
   Mammary Gland                           | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Hyperplasia                          | 3  3  2  2     2  3  2  3  3  2  3  3  4  2  3  3  4  3  4  4  4  1  3  2|             
                                           |__________________________________________________________________________|             
   Skin                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  M  +  +  +  +  +  +  +  +  +  +  +|             
 _____________________________________________________________________________________________________________________|             
 MUSCULOSKELETAL SYSTEM                    |                                                                          |             
                                           |__________________________________________________________________________|             
   Bone                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                           |__________________________________________________________________________|             
   Skeletal Muscle                         |                                                                          |             
 _____________________________________________________________________________________________________________________|             
 NERVOUS SYSTEM                            |                                                                          |             
                                           |__________________________________________________________________________|             
   Brain                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Compression                          | 2     3        2                                4  4     2  2            |             
      Hydrocephalus                        |                                                 2  3                     |             
                                           |__________________________________________________________________________|             
   Peripheral Nerve                        |                                                                          |             
                                           |__________________________________________________________________________|             
 __________________________________________|__________________________________________________________________________|             
                                                                                                                                    
                                                                                                                                    
                                                             Page  17                                                               
                                                                                                                                   
NTP Experiment-Test: 93023-06                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09  
Study Type: CHRONIC                                           2,4-HEXADIENAL                                      Date: 03/14/01    
Route: GAVAGE                                                                                                     Time: 15:02:06    
 _____________________________________________________________________________________________________________________              
                                           | 7| 6| 7| 7| 3| 7| 7| 7| 7| 7| 7| 7| 7| 7| 7| 7| 7| 6| 7| 7| 7| 7| 7| 7| 7|             
                             DAY ON TEST   | 3| 7| 2| 3| 4| 3| 3| 3| 1| 3| 3| 3| 3| 3| 3| 3| 1| 2| 3| 3| 3| 3| 3| 3| 3|             
                                           | 3| 1| 9| 3| 7| 4| 4| 4| 9| 4| 4| 4| 4| 4| 4| 2| 9| 9| 2| 2| 3| 3| 3| 3| 3|             
 __________________________________________|__________________________________________________________________________|             
                                           | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|             
   FISCHER 344 RATS FEMALE                 | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|             
                               ANIMAL ID   | 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2|             
    22.5                                   | 5| 5| 5| 5| 5| 5| 5| 5| 5| 6| 6| 6| 6| 6| 6| 6| 6| 6| 6| 7| 7| 7| 7| 7| 7|             
    MG/KG/DY                               | 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5|             
 __________________________________________|__________________________________________________________________________|             
 NERVOUS SYSTEM - cont                     |                                                                          |             
   Spinal Cord                             |                                                                          |             
 _____________________________________________________________________________________________________________________|             
 RESPIRATORY SYSTEM                        |                                                                          |             
                                           |__________________________________________________________________________|             
   Lung                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Congestion                           |             3                                                            |             
      Edema                                |       2     3                                                            |             
      Foreign Body                         |                                                                          |             
      Infiltration Cellular, Histiocyte    | 1  1     2     2  1  1  2  1           1  1        1  1  1     1  2  2  1|             
      Inflammation, Granulomatous          |                                                                          |             
      Metaplasia, Osseous                  |                   1                                                      |             
      Alveolar Epithelium, Hyperplasia     |    1                    2  2                                         3   |             
                                           |__________________________________________________________________________|             
   Nose                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Inflammation, Chronic                |       2                 3                                                |             
      Respiratory Epithelium, Hyperplasia  |                                                                   1      |             
                                           |__________________________________________________________________________|             
   Trachea                                 | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
 _____________________________________________________________________________________________________________________|             
 SPECIAL SENSES SYSTEM                     |                                                                          |             
                                           |__________________________________________________________________________|             
   Zymbal's Gland                          |                                                                          |             
 _____________________________________________________________________________________________________________________|             
 URINARY SYSTEM                            |                                                                          |             
                                           |__________________________________________________________________________|             
   Kidney                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Cyst                                 |                                                                          |             
      Inflammation, Chronic                |                      2                                                   |             
      Nephropathy                          |                1  1              1              1        1               |             
      Renal Tubule, Cytoplasmic Alteration |                         2                       2        2               |             
      Renal Tubule, Necrosis               |    4                                                                     |             
      Renal Tubule, Pigmentation           |                         3                       2                        |             
      Transitional Epithelium, Hyperplasia |                      3                                                   |             
                                           |__________________________________________________________________________|             
   Urinary Bladder                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Inflammation, Chronic                |                      2                                                   |             
      Transitional Epithelium, Hyperplasia |                      3                                                   |             
 __________________________________________|__________________________________________________________________________              
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                             Page  18                                                               
                                                                                                                                   
NTP Experiment-Test: 93023-06                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09  
Study Type: CHRONIC                                           2,4-HEXADIENAL                                      Date: 03/14/01    
Route: GAVAGE                                                                                                     Time: 15:02:06    
 __________________________________________________________________________________________________________________________________ 
                                           | 6| 7| 7| 7| 6| 7| 7| 7| 5| 7| 7| 7| 7| 7| 7| 7| 7| 6| 7| 7| 7| 7| 7| 7| 3|            |
                             DAY ON TEST   | 6| 3| 3| 3| 1| 3| 3| 3| 4| 3| 3| 3| 2| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 4|            |
                                           | 4| 2| 2| 2| 0| 5| 5| 5| 4| 5| 4| 4| 2| 4| 4| 3| 3| 4| 3| 3| 4| 4| 4| 4| 6|            |
 __________________________________________|__________________________________________________________________________|      T (*) |
                                           | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|      O     |
   FISCHER 344 RATS FEMALE                 | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|      T     |
                               ANIMAL ID   | 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 3|      A     |
    22.5                                   | 7| 7| 7| 7| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 0|      L     |
    MG/KG/DY                               | 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0|            |
 _____________________________________________________________________________________________________________________|____________|
 ALIMENTARY SYSTEM                         |                                                                          |            |
                                           |__________________________________________________________________________|____________|
   Esophagus                               | +  +  +  +  +  +  +  +  +  +  I  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  47        |
                                           |__________________________________________________________________________|____________|
   Intestine Large, Colon                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
                                           |__________________________________________________________________________|____________|
   Intestine Large, Rectum                 | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
                                           |__________________________________________________________________________|____________|
   Intestine Large, Cecum                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Edema                                |                                                                          |      1  3.0|
      Inflammation, Chronic Active         |                                                                          |      1  3.0|
                                           |__________________________________________________________________________|____________|
   Intestine Small, Duodenum               | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  I  +  +  +|  49        |
                                           |__________________________________________________________________________|____________|
   Intestine Small, Jejunum                | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
                                           |__________________________________________________________________________|____________|
   Intestine Small, Ileum                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  49        |
                                           |__________________________________________________________________________|____________|
   Liver                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Angiectasis                          |                2                                                         |      1  2.0|
      Basophilic Focus                     | X  X  X  X  X  X  X  X  X  X  X  X  X  X  X  X  X  X  X  X  X  X  X  X  X|     49     |
      Clear Cell Focus                     |                X              X           X                    X  X      |      8     |
      Eosinophilic Focus                   |             X  X     X           X     X              X                  |     10     |
      Hepatodiaphragmatic Nodule           |                               X                                      X   |      6     |
      Infiltration Cellular, Mixed Cell    |    3                 2        1     2                             3  1   |     10  1.8|
      Mixed Cell Focus                     |                   X           X     X     X                 X  X         |     12     |
      Hepatocyte, Vacuolization Cytoplasmic|                                                                          |      3  2.7|
      Kupffer Cell, Pigmentation           |    2     2                                                               |      3  2.3|
                                           |__________________________________________________________________________|____________|
   Mesentery                               | +              +     +                 +     +              +  +  +      |  16        |
      Fat, Necrosis                        | 2              2     3                 2     3              3  3  1      |     16  2.8|
                                           |__________________________________________________________________________|____________|
   Pancreas                                | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Atrophy                              |       2           1  2                             2              2      |     12  1.6|
      Cyst                                 |                                                          3               |      4  3.0|
 _____________________________________________________________________________________________________________________|____________|
                                                                                                                                    
  * : Total animals with tissue examined microscopically; total animals with lesion and mean severity grade                         
  + : Tissue examined microscopically                M : Missing tissue                        1-4 : Lesion qualified as:           
  X : Lesion present but not qualified               A : Autolysis precludes examination               1) Minimal  3) Moderate      
  I : Insufficient tissue                        BLANK : Not examined                                  2) Mild     4) Marked        
                                                                                                                                    
                                                             Page  19                                                               
                                                                                                                                   
NTP Experiment-Test: 93023-06                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09  
Study Type: CHRONIC                                           2,4-HEXADIENAL                                      Date: 03/14/01    
Route: GAVAGE                                                                                                     Time: 15:02:06    
 __________________________________________________________________________________________________________________________________ 
                                           | 6| 7| 7| 7| 6| 7| 7| 7| 5| 7| 7| 7| 7| 7| 7| 7| 7| 6| 7| 7| 7| 7| 7| 7| 3|            |
                             DAY ON TEST   | 6| 3| 3| 3| 1| 3| 3| 3| 4| 3| 3| 3| 2| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 4|            |
                                           | 4| 2| 2| 2| 0| 5| 5| 5| 4| 5| 4| 4| 2| 4| 4| 3| 3| 4| 3| 3| 4| 4| 4| 4| 6|            |
 __________________________________________|__________________________________________________________________________|      T (*) |
                                           | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|      O     |
   FISCHER 344 RATS FEMALE                 | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|      T     |
                               ANIMAL ID   | 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 3|      A     |
    22.5                                   | 7| 7| 7| 7| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 0|      L     |
    MG/KG/DY                               | 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0|            |
 _____________________________________________________________________________________________________________________|____________|
 ALIMENTARY SYSTEM - cont                  |                                                                          |            |
      Acinus, Cytoplasmic Alteration       |                                                                          |      2  3.0|
      Acinus, Hyperplasia, Focal           |                                                                          |      2  1.5|
                                           |__________________________________________________________________________|____________|
   Salivary Glands                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Atrophy                              |                      2                                                   |      2  2.0|
      Necrosis                             |                                                                          |      1  4.0|
                                           |__________________________________________________________________________|____________|
   Stomach, Forestomach                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  49        |
      Edema                                |                                                                          |      1  4.0|
      Epithelium, Hyperplasia              |          1     1     1     1           1     1                 1  1      |     16  1.1|
                                           |__________________________________________________________________________|____________|
   Stomach, Glandular                      | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  49        |
 _____________________________________________________________________________________________________________________|            |
 CARDIOVASCULAR SYSTEM                     |                                                                          |            |
                                           |__________________________________________________________________________|____________|
   Heart                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Cardiomyopathy                       | 1     1  1     1     1  1           2  2                 2  1     1  2   |     20  1.4|
      Myocardium, Necrosis                 |                                                                          |      1  3.0|
 _____________________________________________________________________________________________________________________|            |
 ENDOCRINE SYSTEM                          |                                                                          |            |
                                           |__________________________________________________________________________|____________|
   Adrenal Cortex                          | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Accessory Adrenal Cortical Nodule    |    3           3              3                                   3  3   |     13  3.0|
      Angiectasis                          |                               3                                          |      2  2.5|
      Degeneration, Fatty                  |       2     3              3     1              1                    2   |     11  2.0|
      Hyperplasia, Focal                   |                                                                1     2   |      6  1.8|
      Hypertrophy, Focal                   |       2     2              3     2              1                    2   |      9  2.1|
                                           |__________________________________________________________________________|____________|
   Adrenal Medulla                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  49        |
      Hyperplasia                          |             1                                                            |      1  1.0|
                                           |__________________________________________________________________________|____________|
   Islets, Pancreatic                      | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Hyperplasia                          |                                                          2               |      2  2.5|
                                           |__________________________________________________________________________|____________|
 _____________________________________________________________________________________________________________________|____________|
                                                                                                                                    
  * : Total animals with tissue examined microscopically; total animals with lesion and mean severity grade                         
  + : Tissue examined microscopically                M : Missing tissue                        1-4 : Lesion qualified as:           
  X : Lesion present but not qualified               A : Autolysis precludes examination               1) Minimal  3) Moderate      
  I : Insufficient tissue                        BLANK : Not examined                                  2) Mild     4) Marked        
                                                                                                                                    
                                                             Page  20                                                               
                                                                                                                                   
NTP Experiment-Test: 93023-06                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09  
Study Type: CHRONIC                                           2,4-HEXADIENAL                                      Date: 03/14/01    
Route: GAVAGE                                                                                                     Time: 15:02:06    
 __________________________________________________________________________________________________________________________________ 
                                           | 6| 7| 7| 7| 6| 7| 7| 7| 5| 7| 7| 7| 7| 7| 7| 7| 7| 6| 7| 7| 7| 7| 7| 7| 3|            |
                             DAY ON TEST   | 6| 3| 3| 3| 1| 3| 3| 3| 4| 3| 3| 3| 2| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 4|            |
                                           | 4| 2| 2| 2| 0| 5| 5| 5| 4| 5| 4| 4| 2| 4| 4| 3| 3| 4| 3| 3| 4| 4| 4| 4| 6|            |
 __________________________________________|__________________________________________________________________________|      T (*) |
                                           | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|      O     |
   FISCHER 344 RATS FEMALE                 | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|      T     |
                               ANIMAL ID   | 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 3|      A     |
    22.5                                   | 7| 7| 7| 7| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 0|      L     |
    MG/KG/DY                               | 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0|            |
 _____________________________________________________________________________________________________________________|____________|
 ENDOCRINE SYSTEM - cont                   |                                                                          |            |
   Parathyroid Gland                       | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  48        |
                                           |__________________________________________________________________________|____________|
   Pituitary Gland                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Pars Distalis, Angiectasis           |                                                 3                    4   |      3  3.0|
      Pars Distalis, Cyst                  |       3           3           3           3     3                    3   |     14  3.0|
      Pars Distalis, Hyperplasia, Focal    |                3                          1                          3   |      8  2.5|
      Pars Distalis, Hyperplasia           |                                                                          |      3  2.0|
      Pars Intermedia, Cyst                |                                                                          |      1  3.0|
                                           |__________________________________________________________________________|____________|
   Thyroid Gland                           | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Ultimobranchial Cyst                 |                                                             3     3      |      2  3.0|
      C-Cell, Hyperplasia                  | 2  1  1  2     1           1     1  2     1           2  1     2  2      |     22  1.3|
      Follicle, Cyst                       |                            3                                             |      1  3.0|
 _____________________________________________________________________________________________________________________|            |
 GENERAL BODY SYSTEM                       |                                                                          |            |
    None                                   |                                                                          |            |
 _____________________________________________________________________________________________________________________|            |
 GENITAL SYSTEM                            |                                                                          |            |
                                           |__________________________________________________________________________|____________|
   Clitoral Gland                          | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Cyst                                 |                      3     3                                             |      6  3.0|
      Inflammation, Chronic                |                2           3     3  2                                    |      6  2.3|
                                           |__________________________________________________________________________|____________|
   Ovary                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Cyst                                 | 4                    3                             4                     |      7  3.6|
                                           |__________________________________________________________________________|____________|
   Uterus                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Hydrometra                           |                         2                                               4|      7  2.9|
      Hyperplasia, Cystic                  |                                  4                          1            |      4  2.3|
                                           |__________________________________________________________________________|____________|
   Vagina                                  |             +                                                            |   3        |
 _____________________________________________________________________________________________________________________|            |
 HEMATOPOIETIC SYSTEM                      |                                                                          |            |
                                           |__________________________________________________________________________|____________|
 _____________________________________________________________________________________________________________________|____________|
                                                                                                                                    
  * : Total animals with tissue examined microscopically; total animals with lesion and mean severity grade                         
  + : Tissue examined microscopically                M : Missing tissue                        1-4 : Lesion qualified as:           
  X : Lesion present but not qualified               A : Autolysis precludes examination               1) Minimal  3) Moderate      
  I : Insufficient tissue                        BLANK : Not examined                                  2) Mild     4) Marked        
                                                                                                                                    
                                                             Page  21                                                               
                                                                                                                                   
NTP Experiment-Test: 93023-06                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09  
Study Type: CHRONIC                                           2,4-HEXADIENAL                                      Date: 03/14/01    
Route: GAVAGE                                                                                                     Time: 15:02:06    
 __________________________________________________________________________________________________________________________________ 
                                           | 6| 7| 7| 7| 6| 7| 7| 7| 5| 7| 7| 7| 7| 7| 7| 7| 7| 6| 7| 7| 7| 7| 7| 7| 3|            |
                             DAY ON TEST   | 6| 3| 3| 3| 1| 3| 3| 3| 4| 3| 3| 3| 2| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 4|            |
                                           | 4| 2| 2| 2| 0| 5| 5| 5| 4| 5| 4| 4| 2| 4| 4| 3| 3| 4| 3| 3| 4| 4| 4| 4| 6|            |
 __________________________________________|__________________________________________________________________________|      T (*) |
                                           | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|      O     |
   FISCHER 344 RATS FEMALE                 | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|      T     |
                               ANIMAL ID   | 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 3|      A     |
    22.5                                   | 7| 7| 7| 7| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 0|      L     |
    MG/KG/DY                               | 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0|            |
 _____________________________________________________________________________________________________________________|____________|
 HEMATOPOIETIC SYSTEM - cont               |                                                                          |            |
   Bone Marrow                             | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Hyperplasia                          |             2     2                                                      |      5  2.0|
      Infiltration Cellular, Histiocyte    |                                                                          |      1  4.0|
                                           |__________________________________________________________________________|____________|
   Lymph Node                              | +  +  +  +        +  +  +  +  +  +  +     +  +        +        +     +   |  30        |
      Deep Cervical, Hemorrhage            |                                                                          |      1  3.0|
      Deep Cervical, Pigmentation          |                                                                          |      1  3.0|
      Mediastinal, Hemorrhage              |                                           1                              |      3  1.7|
      Mediastinal, Hyperplasia, Lymphoid   |                   2                 3     3  3                           |      8  2.8|
      Mediastinal, Pigmentation            |                                           3  3        3                  |      8  2.6|
      Pancreatic, Hemorrhage               |       1           2        1  2                                      2   |      8  1.6|
      Pancreatic, Hyperplasia, Lymphoid    | 2  2  3  3        2  3  3  3  2  3        2  3        2        3         |     24  2.3|
      Pancreatic, Pigmentation             | 1  2  3  2        2  2  2  3  3  2        2  2        2        2     2   |     25  1.9|
                                           |__________________________________________________________________________|____________|
   Lymph Node, Mandibular                  | M  M  M  M  M  M  M  M  M  M  M  M  +  M  M  M  M  M  M  M  M  M  M  M  M|   2        |
      Ectasia                              |                                                                          |      1  3.0|
      Pigmentation                         |                                     2                                    |      1  2.0|
                                           |__________________________________________________________________________|____________|
   Lymph Node, Mesenteric                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Hemorrhage                           |       1              1              2                             1      |      6  1.3|
      Hyperplasia, Lymphoid                | 2        2     3     2  2  2        2              2           2  2     2|     17  2.2|
      Pigmentation                         | 3  3  2  3  2  3  3  3  2  3        2  3  3        3  3  2  2  2  3  3  2|     42  2.6|
                                           |__________________________________________________________________________|____________|
   Spleen                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Hematopoietic Cell Proliferation     |    3  2     3  1  3  2     2  2  1     3     1              1  1  2  2   |     26  2.0|
      Pigmentation                         |    2     2     2     3     2  2  3  3  2  2  2              2  2  2  2  2|     34  2.3|
                                           |__________________________________________________________________________|____________|
   Thymus                                  | +  +  +  +  +  +  +  +  +  I  +  +  +  +  +  +  +  +  I  +  +  +  +  +  +|  47        |
 _____________________________________________________________________________________________________________________|            |
 INTEGUMENTARY SYSTEM                      |                                                                          |            |
                                           |__________________________________________________________________________|____________|
   Mammary Gland                           | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Hyperplasia                          | 2  2  2  3  3  3  2  4     3  3  3  2  3  2  3  3  3  4  3  1  2  3  3   |     47  2.8|
                                           |__________________________________________________________________________|____________|
 _____________________________________________________________________________________________________________________|____________|
                                                                                                                                    
  * : Total animals with tissue examined microscopically; total animals with lesion and mean severity grade                         
  + : Tissue examined microscopically                M : Missing tissue                        1-4 : Lesion qualified as:           
  X : Lesion present but not qualified               A : Autolysis precludes examination               1) Minimal  3) Moderate      
  I : Insufficient tissue                        BLANK : Not examined                                  2) Mild     4) Marked        
                                                                                                                                    
                                                             Page  22                                                               
                                                                                                                                   
NTP Experiment-Test: 93023-06                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09  
Study Type: CHRONIC                                           2,4-HEXADIENAL                                      Date: 03/14/01    
Route: GAVAGE                                                                                                     Time: 15:02:06    
 __________________________________________________________________________________________________________________________________ 
                                           | 6| 7| 7| 7| 6| 7| 7| 7| 5| 7| 7| 7| 7| 7| 7| 7| 7| 6| 7| 7| 7| 7| 7| 7| 3|            |
                             DAY ON TEST   | 6| 3| 3| 3| 1| 3| 3| 3| 4| 3| 3| 3| 2| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 4|            |
                                           | 4| 2| 2| 2| 0| 5| 5| 5| 4| 5| 4| 4| 2| 4| 4| 3| 3| 4| 3| 3| 4| 4| 4| 4| 6|            |
 __________________________________________|__________________________________________________________________________|      T (*) |
                                           | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|      O     |
   FISCHER 344 RATS FEMALE                 | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|      T     |
                               ANIMAL ID   | 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 3|      A     |
    22.5                                   | 7| 7| 7| 7| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 0|      L     |
    MG/KG/DY                               | 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0|            |
 _____________________________________________________________________________________________________________________|____________|
 INTEGUMENTARY SYSTEM - cont               |                                                                          |            |
   Skin                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  49        |
 _____________________________________________________________________________________________________________________|            |
 MUSCULOSKELETAL SYSTEM                    |                                                                          |            |
                                           |__________________________________________________________________________|____________|
   Bone                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
                                           |__________________________________________________________________________|____________|
   Skeletal Muscle                         | +                                                                        |   1        |
 _____________________________________________________________________________________________________________________|            |
 NERVOUS SYSTEM                            |                                                                          |            |
                                           |__________________________________________________________________________|____________|
   Brain                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Compression                          |    2        2        2           4                    2                  |     12  2.6|
      Hydrocephalus                        |    2     2  2              2     3                    2                  |      8  2.3|
                                           |__________________________________________________________________________|____________|
   Peripheral Nerve                        | +                                                                        |   1        |
                                           |__________________________________________________________________________|____________|
   Spinal Cord                             | +                                                                        |   1        |
 _____________________________________________________________________________________________________________________|            |
 RESPIRATORY SYSTEM                        |                                                                          |            |
                                           |__________________________________________________________________________|____________|
   Lung                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Congestion                           |                                                                         2|      2  2.5|
      Edema                                |                                                                          |      2  2.5|
      Foreign Body                         |                                                          X               |      1     |
      Infiltration Cellular, Histiocyte    | 1  1  1  1  1  1  1  1  1  1  1  1  3  1  1  1  1  1  1  2  1  2  2  2   |     41  1.3|
      Inflammation, Granulomatous          |                                                          2               |      1  2.0|
      Metaplasia, Osseous                  |                                                       1                  |      2  1.0|
      Alveolar Epithelium, Hyperplasia     |                      1              2                                    |      6  1.8|
                                           |__________________________________________________________________________|____________|
   Nose                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Inflammation, Chronic                |       1                                                                  |      3  2.0|
      Respiratory Epithelium, Hyperplasia  |                                                                          |      1  1.0|
                                           |__________________________________________________________________________|____________|
   Trachea                                 | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
 _____________________________________________________________________________________________________________________|____________|
                                                                                                                                    
  * : Total animals with tissue examined microscopically; total animals with lesion and mean severity grade                         
  + : Tissue examined microscopically                M : Missing tissue                        1-4 : Lesion qualified as:           
  X : Lesion present but not qualified               A : Autolysis precludes examination               1) Minimal  3) Moderate      
  I : Insufficient tissue                        BLANK : Not examined                                  2) Mild     4) Marked        
                                                                                                                                    
                                                             Page  23                                                               
                                                                                                                                   
NTP Experiment-Test: 93023-06                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09  
Study Type: CHRONIC                                           2,4-HEXADIENAL                                      Date: 03/14/01    
Route: GAVAGE                                                                                                     Time: 15:02:06    
 __________________________________________________________________________________________________________________________________ 
                                           | 6| 7| 7| 7| 6| 7| 7| 7| 5| 7| 7| 7| 7| 7| 7| 7| 7| 6| 7| 7| 7| 7| 7| 7| 3|            |
                             DAY ON TEST   | 6| 3| 3| 3| 1| 3| 3| 3| 4| 3| 3| 3| 2| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 4|            |
                                           | 4| 2| 2| 2| 0| 5| 5| 5| 4| 5| 4| 4| 2| 4| 4| 3| 3| 4| 3| 3| 4| 4| 4| 4| 6|            |
 __________________________________________|__________________________________________________________________________|      T (*) |
                                           | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|      O     |
   FISCHER 344 RATS FEMALE                 | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|      T     |
                               ANIMAL ID   | 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 3|      A     |
    22.5                                   | 7| 7| 7| 7| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 0|      L     |
    MG/KG/DY                               | 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0|            |
 _____________________________________________________________________________________________________________________|____________|
 SPECIAL SENSES SYSTEM                     |                                                                          |            |
                                           |__________________________________________________________________________|____________|
   Zymbal's Gland                          |                   +                                                      |   1        |
 _____________________________________________________________________________________________________________________|            |
 URINARY SYSTEM                            |                                                                          |            |
                                           |__________________________________________________________________________|____________|
   Kidney                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Cyst                                 |                      3                                                   |      1  3.0|
      Inflammation, Chronic                |                               2                                          |      2  2.0|
      Nephropathy                          |                                                       1                  |      6  1.0|
      Renal Tubule, Cytoplasmic Alteration |                                                       2                  |      4  2.0|
      Renal Tubule, Necrosis               |                                                                          |      1  4.0|
      Renal Tubule, Pigmentation           |                                                                          |      2  2.5|
      Transitional Epithelium, Hyperplasia |                                                                          |      1  3.0|
                                           |__________________________________________________________________________|____________|
   Urinary Bladder                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Inflammation, Chronic                |                                                                          |      1  2.0|
      Transitional Epithelium, Hyperplasia |                                                                          |      1  3.0|
 __________________________________________________________________________________________________________________________________ 
                                                                                                                                    
  * : Total animals with tissue examined microscopically; total animals with lesion and mean severity grade                         
  + : Tissue examined microscopically                M : Missing tissue                        1-4 : Lesion qualified as:           
  X : Lesion present but not qualified               A : Autolysis precludes examination               1) Minimal  3) Moderate      
  I : Insufficient tissue                        BLANK : Not examined                                  2) Mild     4) Marked        
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                             Page  24                                                               
                                                                                                                                   
NTP Experiment-Test: 93023-06                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09  
Study Type: CHRONIC                                           2,4-HEXADIENAL                                      Date: 03/14/01    
Route: GAVAGE                                                                                                     Time: 15:02:06    
 _____________________________________________________________________________________________________________________              
                                           | 7| 7| 7| 7| 7| 5| 7| 7| 7| 7| 7| 4| 7| 7| 7| 7| 7| 4| 7| 7| 7| 6| 7| 6| 7|             
                             DAY ON TEST   | 3| 3| 3| 3| 3| 4| 3| 3| 3| 3| 3| 8| 3| 3| 3| 3| 3| 7| 3| 3| 3| 5| 3| 7| 3|             
                                           | 2| 2| 2| 2| 2| 6| 3| 3| 3| 3| 3| 3| 3| 3| 3| 2| 2| 6| 2| 2| 2| 9| 2| 1| 2|             
 __________________________________________|__________________________________________________________________________|             
                                           | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|             
   FISCHER 344 RATS FEMALE                 | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|             
                               ANIMAL ID   | 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3|             
    45                                     | 0| 0| 0| 0| 0| 0| 0| 0| 0| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 2| 2| 2| 2| 2| 2|             
    MG/KG/DY                               | 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5|             
 __________________________________________|__________________________________________________________________________|             
 ALIMENTARY SYSTEM                         |                                                                          |             
                                           |__________________________________________________________________________|             
   Esophagus                               | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                           |__________________________________________________________________________|             
   Intestine Large, Colon                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                           |__________________________________________________________________________|             
   Intestine Large, Rectum                 | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                           |__________________________________________________________________________|             
   Intestine Large, Cecum                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                           |__________________________________________________________________________|             
   Intestine Small, Duodenum               | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                           |__________________________________________________________________________|             
   Intestine Small, Jejunum                | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                           |__________________________________________________________________________|             
   Intestine Small, Ileum                  | +  +  M  +  +  +  M  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                           |__________________________________________________________________________|             
   Liver                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Angiectasis                          |    2                                                                     |             
      Basophilic Focus                     | X  X  X  X  X  X  X  X  X  X  X  X     X  X  X  X  X  X  X  X  X  X  X  X|             
      Clear Cell Focus                     | X        X                                                        X      |             
      Eosinophilic Focus                   |             X     X                                                      |             
      Hepatodiaphragmatic Nodule           |                X        X     X        X                                 |             
      Infiltration Cellular, Mixed Cell    |                                  1  2           2                        |             
      Mixed Cell Focus                     | X     X                                                              X   |             
      Hepatocyte, Necrosis                 |                                                                1         |             
                                           |__________________________________________________________________________|             
   Mesentery                               |                            +     +  +  +        +     +  +           +  +|             
      Fat, Necrosis                        |                            4     2  3  4        4     4  2              3|             
                                           |__________________________________________________________________________|             
   Pancreas                                | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Atrophy                              |    1                                         3  1                    3   |             
      Cyst                                 |                                                                          |             
      Acinus, Hyperplasia, Focal           |    2                                                                     |             
                                           |__________________________________________________________________________|             
   Salivary Glands                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Atrophy                              |                   2                    3              2                  |             
                                           |__________________________________________________________________________|             
   Stomach, Forestomach                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Inflammation, Chronic Active         |                                                                          |             
 __________________________________________|__________________________________________________________________________|             
                                                                                                                                    
                                                                                                                                    
                                                             Page  25                                                               
                                                                                                                                   
NTP Experiment-Test: 93023-06                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09  
Study Type: CHRONIC                                           2,4-HEXADIENAL                                      Date: 03/14/01    
Route: GAVAGE                                                                                                     Time: 15:02:06    
 _____________________________________________________________________________________________________________________              
                                           | 7| 7| 7| 7| 7| 5| 7| 7| 7| 7| 7| 4| 7| 7| 7| 7| 7| 4| 7| 7| 7| 6| 7| 6| 7|             
                             DAY ON TEST   | 3| 3| 3| 3| 3| 4| 3| 3| 3| 3| 3| 8| 3| 3| 3| 3| 3| 7| 3| 3| 3| 5| 3| 7| 3|             
                                           | 2| 2| 2| 2| 2| 6| 3| 3| 3| 3| 3| 3| 3| 3| 3| 2| 2| 6| 2| 2| 2| 9| 2| 1| 2|             
 __________________________________________|__________________________________________________________________________|             
                                           | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|             
   FISCHER 344 RATS FEMALE                 | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|             
                               ANIMAL ID   | 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3|             
    45                                     | 0| 0| 0| 0| 0| 0| 0| 0| 0| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 2| 2| 2| 2| 2| 2|             
    MG/KG/DY                               | 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5|             
 __________________________________________|__________________________________________________________________________|             
 ALIMENTARY SYSTEM - cont                  |                                                                          |             
      Epithelium, Hyperplasia              | 1     1  1  1     1     2           2  1  2  1  2     2  1  1     1  1  1|             
                                           |__________________________________________________________________________|             
   Stomach, Glandular                      | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Ulcer                                |                                                                          |             
                                           |__________________________________________________________________________|             
   Tongue                                  |                                                    +                     |             
 _____________________________________________________________________________________________________________________|             
 CARDIOVASCULAR SYSTEM                     |                                                                          |             
                                           |__________________________________________________________________________|             
   Heart                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Cardiomyopathy                       |                   1  2  1  2  1     1           1        1              2|             
 _____________________________________________________________________________________________________________________|             
 ENDOCRINE SYSTEM                          |                                                                          |             
                                           |__________________________________________________________________________|             
   Adrenal Cortex                          | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Accessory Adrenal Cortical Nodule    |    3  3           3  3  3     3        3  3           3              3   |             
      Angiectasis                          |                                                                          |             
      Degeneration, Fatty                  |          1  2           1  1  1                          2        3      |             
      Hyperplasia, Diffuse                 |                                                                          |             
      Hyperplasia, Focal                   |                         1     2                                   3      |             
      Hypertrophy, Focal                   |             3  1  2        1     2              2                 3      |             
                                           |__________________________________________________________________________|             
   Adrenal Medulla                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Hyperplasia                          |                                                                          |             
                                           |__________________________________________________________________________|             
   Islets, Pancreatic                      | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Hyperplasia                          |                                                                          |             
                                           |__________________________________________________________________________|             
   Parathyroid Gland                       | +  +  +  +  +  +  +  +  +  M  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                           |__________________________________________________________________________|             
   Pituitary Gland                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Pars Distalis, Angiectasis           |                      3                                                   |             
      Pars Distalis, Cyst                  |    3                 3        3        3              3              3  3|             
      Pars Distalis, Hyperplasia, Focal    |    1              2  2                                1                  |             
      Pars Distalis, Hyperplasia           |                         2                                                |             
      Pars Intermedia, Angiectasis         |                                                                          |             
                                           |__________________________________________________________________________|             
   Thyroid Gland                           | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
 __________________________________________|__________________________________________________________________________|             
                                                                                                                                    
                                                                                                                                    
                                                             Page  26                                                               
                                                                                                                                   
NTP Experiment-Test: 93023-06                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09  
Study Type: CHRONIC                                           2,4-HEXADIENAL                                      Date: 03/14/01    
Route: GAVAGE                                                                                                     Time: 15:02:06    
 _____________________________________________________________________________________________________________________              
                                           | 7| 7| 7| 7| 7| 5| 7| 7| 7| 7| 7| 4| 7| 7| 7| 7| 7| 4| 7| 7| 7| 6| 7| 6| 7|             
                             DAY ON TEST   | 3| 3| 3| 3| 3| 4| 3| 3| 3| 3| 3| 8| 3| 3| 3| 3| 3| 7| 3| 3| 3| 5| 3| 7| 3|             
                                           | 2| 2| 2| 2| 2| 6| 3| 3| 3| 3| 3| 3| 3| 3| 3| 2| 2| 6| 2| 2| 2| 9| 2| 1| 2|             
 __________________________________________|__________________________________________________________________________|             
                                           | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|             
   FISCHER 344 RATS FEMALE                 | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|             
                               ANIMAL ID   | 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3|             
    45                                     | 0| 0| 0| 0| 0| 0| 0| 0| 0| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 2| 2| 2| 2| 2| 2|             
    MG/KG/DY                               | 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5|             
 __________________________________________|__________________________________________________________________________|             
 ENDOCRINE SYSTEM - cont                   |                                                                          |             
      C-Cell, Hyperplasia                  | 2           1     2  2  2  3  1  1  2     1              2  1           1|             
      Follicle, Cyst                       |                                                                          |             
 _____________________________________________________________________________________________________________________|             
 GENERAL BODY SYSTEM                       |                                                                          |             
    None                                   |                                                                          |             
 _____________________________________________________________________________________________________________________|             
 GENITAL SYSTEM                            |                                                                          |             
                                           |__________________________________________________________________________|             
   Clitoral Gland                          | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Cyst                                 |                      3                                                   |             
      Inflammation, Chronic                |                                              3                           |             
                                           |__________________________________________________________________________|             
   Ovary                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Cyst                                 |                   3        3  4                                      3  3|             
                                           |__________________________________________________________________________|             
   Uterus                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Hydrometra                           |                2     2     3                                             |             
      Hyperplasia, Cystic                  |             2     2           2                                          |             
      Inflammation, Chronic                |    1                                                                     |             
                                           |__________________________________________________________________________|             
   Vagina                                  |                                                                          |             
 _____________________________________________________________________________________________________________________|             
 HEMATOPOIETIC SYSTEM                      |                                                                          |             
                                           |__________________________________________________________________________|             
   Bone Marrow                             | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Hyperplasia                          |                   2                                               2      |             
                                           |__________________________________________________________________________|             
   Lymph Node                              | +  +  +                    +  +     +  +  +  +  +  +  +     +  +  +     +|             
      Deep Cervical, Hemorrhage            |                                                                          |             
      Deep Cervical, Pigmentation          |                                                                          |             
      Mediastinal, Hemorrhage              |                                                                         4|             
      Mediastinal, Hyperplasia, Lymphoid   |                                                    3        3           3|             
      Mediastinal, Pigmentation            |                                     2                                   2|             
      Pancreatic, Hemorrhage               | 1  1                                   1              3        2  1      |             
      Pancreatic, Hyperplasia, Lymphoid    | 3  2  2                       3        3  3  2  2     2        3         |             
      Pancreatic, Pigmentation             | 2  2  3                    1  1        2  1  1  3     3        2  1      |             
                                           |__________________________________________________________________________|             
   Lymph Node, Mandibular                  | M  M  M  M  M  M  M  +  M  M  M  M  M  +  M  M  M  M  M  M  M  +  M  +  M|             
 __________________________________________|__________________________________________________________________________|             
                                                                                                                                    
                                                                                                                                    
                                                             Page  27                                                               
                                                                                                                                   
NTP Experiment-Test: 93023-06                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09  
Study Type: CHRONIC                                           2,4-HEXADIENAL                                      Date: 03/14/01    
Route: GAVAGE                                                                                                     Time: 15:02:06    
 _____________________________________________________________________________________________________________________              
                                           | 7| 7| 7| 7| 7| 5| 7| 7| 7| 7| 7| 4| 7| 7| 7| 7| 7| 4| 7| 7| 7| 6| 7| 6| 7|             
                             DAY ON TEST   | 3| 3| 3| 3| 3| 4| 3| 3| 3| 3| 3| 8| 3| 3| 3| 3| 3| 7| 3| 3| 3| 5| 3| 7| 3|             
                                           | 2| 2| 2| 2| 2| 6| 3| 3| 3| 3| 3| 3| 3| 3| 3| 2| 2| 6| 2| 2| 2| 9| 2| 1| 2|             
 __________________________________________|__________________________________________________________________________|             
                                           | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|             
   FISCHER 344 RATS FEMALE                 | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|             
                               ANIMAL ID   | 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3|             
    45                                     | 0| 0| 0| 0| 0| 0| 0| 0| 0| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 2| 2| 2| 2| 2| 2|             
    MG/KG/DY                               | 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5|             
 __________________________________________|__________________________________________________________________________|             
 HEMATOPOIETIC SYSTEM - cont               |                                                                          |             
      Ectasia                              |                                        3                             3   |             
                                           |__________________________________________________________________________|             
   Lymph Node, Mesenteric                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Hemorrhage                           |                                                                         1|             
      Hyperplasia, Lymphoid                |    2  2           2              2           2     2        2           2|             
      Pigmentation                         | 2        3           2  2     2           3     2  2  2  3  3  2  3  2  3|             
                                           |__________________________________________________________________________|             
   Spleen                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Hematopoietic Cell Proliferation     | 2     2     1     3        1  2        2  2     2     1  2  2     1     2|             
      Pigmentation                         | 2     2     2  3     2  2  2     2     2  2  3        2  3  3  3  3     2|             
                                           |__________________________________________________________________________|             
   Thymus                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
 _____________________________________________________________________________________________________________________|             
 INTEGUMENTARY SYSTEM                      |                                                                          |             
                                           |__________________________________________________________________________|             
   Mammary Gland                           | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Hyperplasia                          | 3  3  2  2  3  2  2  3  2  3  3     2  2  2  3  2     3  3  3  3  3  2  2|             
                                           |__________________________________________________________________________|             
   Skin                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
 _____________________________________________________________________________________________________________________|             
 MUSCULOSKELETAL SYSTEM                    |                                                                          |             
                                           |__________________________________________________________________________|             
   Bone                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
 _____________________________________________________________________________________________________________________|             
 NERVOUS SYSTEM                            |                                                                          |             
                                           |__________________________________________________________________________|             
   Brain                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Compression                          |                3                             2              2  3         |             
      Hydrocephalus                        |                                                                          |             
 _____________________________________________________________________________________________________________________|             
 RESPIRATORY SYSTEM                        |                                                                          |             
                                           |__________________________________________________________________________|             
   Lung                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Congestion                           |                3                 2                                       |             
      Edema                                |                2                 3                                       |             
      Foreign Body                         |                                                                          |             
      Hemorrhage                           |                                                                1         |             
      Infiltration Cellular, Histiocyte    | 1  1  2  1  1  3     1  2  1  1     1        2  1  1  2  1  2  1  1     1|             
 __________________________________________|__________________________________________________________________________|             
                                                                                                                                    
                                                                                                                                    
                                                             Page  28                                                               
                                                                                                                                   
NTP Experiment-Test: 93023-06                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09  
Study Type: CHRONIC                                           2,4-HEXADIENAL                                      Date: 03/14/01    
Route: GAVAGE                                                                                                     Time: 15:02:06    
 _____________________________________________________________________________________________________________________              
                                           | 7| 7| 7| 7| 7| 5| 7| 7| 7| 7| 7| 4| 7| 7| 7| 7| 7| 4| 7| 7| 7| 6| 7| 6| 7|             
                             DAY ON TEST   | 3| 3| 3| 3| 3| 4| 3| 3| 3| 3| 3| 8| 3| 3| 3| 3| 3| 7| 3| 3| 3| 5| 3| 7| 3|             
                                           | 2| 2| 2| 2| 2| 6| 3| 3| 3| 3| 3| 3| 3| 3| 3| 2| 2| 6| 2| 2| 2| 9| 2| 1| 2|             
 __________________________________________|__________________________________________________________________________|             
                                           | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|             
   FISCHER 344 RATS FEMALE                 | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|             
                               ANIMAL ID   | 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3|             
    45                                     | 0| 0| 0| 0| 0| 0| 0| 0| 0| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 2| 2| 2| 2| 2| 2|             
    MG/KG/DY                               | 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5|             
 __________________________________________|__________________________________________________________________________|             
 RESPIRATORY SYSTEM - cont                 |                                                                          |             
      Inflammation, Granulomatous          |                                                                          |             
      Alveolar Epithelium, Hyperplasia     |    2  3  3                    3                                2         |             
                                           |__________________________________________________________________________|             
   Nose                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Foreign Body                         |       X                                                           X      |             
      Inflammation, Chronic                | 1     1                                                                  |             
      Respiratory Epithelium, Hyperplasia  | 2                                                                        |             
                                           |__________________________________________________________________________|             
   Trachea                                 | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
 _____________________________________________________________________________________________________________________|             
 SPECIAL SENSES SYSTEM                     |                                                                          |             
                                           |__________________________________________________________________________|             
   Eye                                     |                +                          +                              |             
      Cataract                             |                4                          3                              |             
      Retina, Degeneration                 |                4                          4                              |             
 _____________________________________________________________________________________________________________________|             
 URINARY SYSTEM                            |                                                                          |             
                                           |__________________________________________________________________________|             
   Kidney                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Nephropathy                          | 1                                                        1           1   |             
      Renal Tubule, Cytoplasmic Alteration | 2                                                                        |             
      Renal Tubule, Dilatation             |                                                                          |             
      Renal Tubule, Pigmentation           |                                                                          |             
      Transitional Epithelium, Hyperplasia |                                                                          |             
                                           |__________________________________________________________________________|             
   Urinary Bladder                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
 __________________________________________|__________________________________________________________________________              
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                             Page  29                                                               
                                                                                                                                   
NTP Experiment-Test: 93023-06                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09  
Study Type: CHRONIC                                           2,4-HEXADIENAL                                      Date: 03/14/01    
Route: GAVAGE                                                                                                     Time: 15:02:06    
 __________________________________________________________________________________________________________________________________ 
                                           | 7| 7| 7| 7| 7| 7| 7| 5| 7| 7| 7| 7| 7| 6| 7| 7| 5| 7| 7| 7| 7| 6| 7| 7| 7|            |
                             DAY ON TEST   | 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 1| 3| 3| 4| 3| 3| 3| 3| 0| 3| 3| 3|            |
                                           | 4| 4| 4| 4| 4| 4| 4| 6| 4| 4| 4| 4| 4| 0| 4| 2| 4| 2| 2| 2| 3| 2| 3| 4| 4|            |
 __________________________________________|__________________________________________________________________________|      T (*) |
                                           | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|      O     |
   FISCHER 344 RATS FEMALE                 | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|      T     |
                               ANIMAL ID   | 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3|      A     |
    45                                     | 2| 2| 2| 2| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 5|      L     |
    MG/KG/DY                               | 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0|            |
 _____________________________________________________________________________________________________________________|____________|
 ALIMENTARY SYSTEM                         |                                                                          |            |
                                           |__________________________________________________________________________|____________|
   Esophagus                               | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
                                           |__________________________________________________________________________|____________|
   Intestine Large, Colon                  | +  +  I  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  49        |
                                           |__________________________________________________________________________|____________|
   Intestine Large, Rectum                 | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
                                           |__________________________________________________________________________|____________|
   Intestine Large, Cecum                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
                                           |__________________________________________________________________________|____________|
   Intestine Small, Duodenum               | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
                                           |__________________________________________________________________________|____________|
   Intestine Small, Jejunum                | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
                                           |__________________________________________________________________________|____________|
   Intestine Small, Ileum                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  48        |
                                           |__________________________________________________________________________|____________|
   Liver                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Angiectasis                          |                                                       2                  |      2  2.0|
      Basophilic Focus                     | X  X  X  X  X  X  X     X  X  X  X  X  X  X  X  X  X  X  X  X  X  X  X  X|     48     |
      Clear Cell Focus                     |          X        X        X              X        X           X     X  X|     11     |
      Eosinophilic Focus                   |       X     X              X  X                                          |      6     |
      Hepatodiaphragmatic Nodule           |                   X           X                                          |      6     |
      Infiltration Cellular, Mixed Cell    | 1                             1  2     1     1     1                    1|     10  1.3|
      Mixed Cell Focus                     | X           X                                X                           |      6     |
      Hepatocyte, Necrosis                 |                                                                          |      1  1.0|
                                           |__________________________________________________________________________|____________|
   Mesentery                               |       +  +  +           +     +              +     +  +              +  +|  19        |
      Fat, Necrosis                        |       2  3  3           3     2              3     2  2              3  3|     18  2.9|
                                           |__________________________________________________________________________|____________|
   Pancreas                                | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Atrophy                              | 2                             1  3                       1               |      8  1.9|
      Cyst                                 |                                                                3         |      1  3.0|
      Acinus, Hyperplasia, Focal           |                                           2                              |      2  2.0|
                                           |__________________________________________________________________________|____________|
   Salivary Glands                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
 _____________________________________________________________________________________________________________________|____________|
                                                                                                                                    
  * : Total animals with tissue examined microscopically; total animals with lesion and mean severity grade                         
  + : Tissue examined microscopically                M : Missing tissue                        1-4 : Lesion qualified as:           
  X : Lesion present but not qualified               A : Autolysis precludes examination               1) Minimal  3) Moderate      
  I : Insufficient tissue                        BLANK : Not examined                                  2) Mild     4) Marked        
                                                                                                                                    
                                                             Page  30                                                               
                                                                                                                                   
NTP Experiment-Test: 93023-06                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09  
Study Type: CHRONIC                                           2,4-HEXADIENAL                                      Date: 03/14/01    
Route: GAVAGE                                                                                                     Time: 15:02:06    
 __________________________________________________________________________________________________________________________________ 
                                           | 7| 7| 7| 7| 7| 7| 7| 5| 7| 7| 7| 7| 7| 6| 7| 7| 5| 7| 7| 7| 7| 6| 7| 7| 7|            |
                             DAY ON TEST   | 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 1| 3| 3| 4| 3| 3| 3| 3| 0| 3| 3| 3|            |
                                           | 4| 4| 4| 4| 4| 4| 4| 6| 4| 4| 4| 4| 4| 0| 4| 2| 4| 2| 2| 2| 3| 2| 3| 4| 4|            |
 __________________________________________|__________________________________________________________________________|      T (*) |
                                           | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|      O     |
   FISCHER 344 RATS FEMALE                 | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|      T     |
                               ANIMAL ID   | 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3|      A     |
    45                                     | 2| 2| 2| 2| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 5|      L     |
    MG/KG/DY                               | 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0|            |
 _____________________________________________________________________________________________________________________|____________|
 ALIMENTARY SYSTEM - cont                  |                                                                          |            |
      Atrophy                              |                         1                 3                              |      5  2.2|
                                           |__________________________________________________________________________|____________|
   Stomach, Forestomach                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Inflammation, Chronic Active         |                                                       1                  |      1  1.0|
      Epithelium, Hyperplasia              | 2  1  1  1  2  1  2     1  1  1  2  1     1        1  2  2  2     2  1  2|     37  1.4|
                                           |__________________________________________________________________________|____________|
   Stomach, Glandular                      | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Ulcer                                |                                                                3         |      1  3.0|
                                           |__________________________________________________________________________|____________|
   Tongue                                  |                                                    +                     |   2        |
 _____________________________________________________________________________________________________________________|            |
 CARDIOVASCULAR SYSTEM                     |                                                                          |            |
                                           |__________________________________________________________________________|____________|
   Heart                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Cardiomyopathy                       |             2              1     1  1     2  2              1     2      |     17  1.4|
 _____________________________________________________________________________________________________________________|            |
 ENDOCRINE SYSTEM                          |                                                                          |            |
                                           |__________________________________________________________________________|____________|
   Adrenal Cortex                          | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Accessory Adrenal Cortical Nodule    |       3              3                          3                        |     13  3.0|
      Angiectasis                          |             3                                                            |      1  3.0|
      Degeneration, Fatty                  |             4                             2        1                 1   |     11  1.7|
      Hyperplasia, Diffuse                 |             4                                                            |      1  4.0|
      Hyperplasia, Focal                   |                                     3     1                              |      5  2.0|
      Hypertrophy, Focal                   |                                                                      1   |      8  1.9|
                                           |__________________________________________________________________________|____________|
   Adrenal Medulla                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Hyperplasia                          |             2                                                            |      1  2.0|
                                           |__________________________________________________________________________|____________|
   Islets, Pancreatic                      | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Hyperplasia                          |                                        1                                 |      1  1.0|
                                           |__________________________________________________________________________|____________|
   Parathyroid Gland                       | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  49        |
                                           |__________________________________________________________________________|____________|
 _____________________________________________________________________________________________________________________|____________|
                                                                                                                                    
  * : Total animals with tissue examined microscopically; total animals with lesion and mean severity grade                         
  + : Tissue examined microscopically                M : Missing tissue                        1-4 : Lesion qualified as:           
  X : Lesion present but not qualified               A : Autolysis precludes examination               1) Minimal  3) Moderate      
  I : Insufficient tissue                        BLANK : Not examined                                  2) Mild     4) Marked        
                                                                                                                                    
                                                             Page  31                                                               
                                                                                                                                   
NTP Experiment-Test: 93023-06                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09  
Study Type: CHRONIC                                           2,4-HEXADIENAL                                      Date: 03/14/01    
Route: GAVAGE                                                                                                     Time: 15:02:06    
 __________________________________________________________________________________________________________________________________ 
                                           | 7| 7| 7| 7| 7| 7| 7| 5| 7| 7| 7| 7| 7| 6| 7| 7| 5| 7| 7| 7| 7| 6| 7| 7| 7|            |
                             DAY ON TEST   | 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 1| 3| 3| 4| 3| 3| 3| 3| 0| 3| 3| 3|            |
                                           | 4| 4| 4| 4| 4| 4| 4| 6| 4| 4| 4| 4| 4| 0| 4| 2| 4| 2| 2| 2| 3| 2| 3| 4| 4|            |
 __________________________________________|__________________________________________________________________________|      T (*) |
                                           | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|      O     |
   FISCHER 344 RATS FEMALE                 | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|      T     |
                               ANIMAL ID   | 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3|      A     |
    45                                     | 2| 2| 2| 2| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 5|      L     |
    MG/KG/DY                               | 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0|            |
 _____________________________________________________________________________________________________________________|____________|
 ENDOCRINE SYSTEM - cont                   |                                                                          |            |
   Pituitary Gland                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Pars Distalis, Angiectasis           | 2                    3           2                       3               |      5  2.6|
      Pars Distalis, Cyst                  |                                  3              3     3  3  3            |     12  3.0|
      Pars Distalis, Hyperplasia, Focal    | 2        1           2                                                   |      7  1.6|
      Pars Distalis, Hyperplasia           |                                                                          |      1  2.0|
      Pars Intermedia, Angiectasis         |       2                                                                  |      1  2.0|
                                           |__________________________________________________________________________|____________|
   Thyroid Gland                           | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      C-Cell, Hyperplasia                  | 1  2  1     1  1  1        2        1     2           3     1     2     2|     26  1.6|
      Follicle, Cyst                       |                            3                                             |      1  3.0|
 _____________________________________________________________________________________________________________________|            |
 GENERAL BODY SYSTEM                       |                                                                          |            |
    None                                   |                                                                          |            |
 _____________________________________________________________________________________________________________________|            |
 GENITAL SYSTEM                            |                                                                          |            |
                                           |__________________________________________________________________________|____________|
   Clitoral Gland                          | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Cyst                                 |                                        3                                 |      2  3.0|
      Inflammation, Chronic                |                2        2                                                |      3  2.3|
                                           |__________________________________________________________________________|____________|
   Ovary                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Cyst                                 |                               4     4        3                           |      8  3.4|
                                           |__________________________________________________________________________|____________|
   Uterus                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Hydrometra                           |                         2        2                       2               |      6  2.2|
      Hyperplasia, Cystic                  |    1                                                                     |      4  1.8|
      Inflammation, Chronic                |                                                                          |      1  1.0|
                                           |__________________________________________________________________________|____________|
   Vagina                                  |                                                                +         |   1        |
 _____________________________________________________________________________________________________________________|            |
 HEMATOPOIETIC SYSTEM                      |                                                                          |            |
                                           |__________________________________________________________________________|____________|
   Bone Marrow                             | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Hyperplasia                          |                               4                 3              2         |      5  2.6|
 _____________________________________________________________________________________________________________________|____________|
                                                                                                                                    
  * : Total animals with tissue examined microscopically; total animals with lesion and mean severity grade                         
  + : Tissue examined microscopically                M : Missing tissue                        1-4 : Lesion qualified as:           
  X : Lesion present but not qualified               A : Autolysis precludes examination               1) Minimal  3) Moderate      
  I : Insufficient tissue                        BLANK : Not examined                                  2) Mild     4) Marked        
                                                                                                                                    
                                                             Page  32                                                               
                                                                                                                                   
NTP Experiment-Test: 93023-06                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09  
Study Type: CHRONIC                                           2,4-HEXADIENAL                                      Date: 03/14/01    
Route: GAVAGE                                                                                                     Time: 15:02:06    
 __________________________________________________________________________________________________________________________________ 
                                           | 7| 7| 7| 7| 7| 7| 7| 5| 7| 7| 7| 7| 7| 6| 7| 7| 5| 7| 7| 7| 7| 6| 7| 7| 7|            |
                             DAY ON TEST   | 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 1| 3| 3| 4| 3| 3| 3| 3| 0| 3| 3| 3|            |
                                           | 4| 4| 4| 4| 4| 4| 4| 6| 4| 4| 4| 4| 4| 0| 4| 2| 4| 2| 2| 2| 3| 2| 3| 4| 4|            |
 __________________________________________|__________________________________________________________________________|      T (*) |
                                           | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|      O     |
   FISCHER 344 RATS FEMALE                 | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|      T     |
                               ANIMAL ID   | 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3|      A     |
    45                                     | 2| 2| 2| 2| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 5|      L     |
    MG/KG/DY                               | 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0|            |
 _____________________________________________________________________________________________________________________|____________|
 HEMATOPOIETIC SYSTEM - cont               |                                                                          |            |
                                           |__________________________________________________________________________|____________|
   Lymph Node                              | +  +     +     +  +  +  +     +  +  +  +        +           +  +         |  30        |
      Deep Cervical, Hemorrhage            |                                                                3         |      1  3.0|
      Deep Cervical, Pigmentation          |                                                                2         |      1  2.0|
      Mediastinal, Hemorrhage              |                                  3              1           1            |      4  2.3|
      Mediastinal, Hyperplasia, Lymphoid   |    3           3              2  3  3           3           2            |     10  2.8|
      Mediastinal, Pigmentation            |    3           3              2  4                          2            |      7  2.6|
      Pancreatic, Hemorrhage               |          1     2  1           1     2  1                    2            |     13  1.5|
      Pancreatic, Hyperplasia, Lymphoid    | 3  2     2        2           2     2           3           2            |     18  2.4|
      Pancreatic, Pigmentation             | 1  1     1     1  2  1  1     2     2  1        2           2            |     24  1.6|
                                           |__________________________________________________________________________|____________|
   Lymph Node, Mandibular                  | M  M  M  M  +  M  M  M  M  M  M  M  M  M  M  M  M  M  M  M  M  M  M  M  M|   5        |
      Ectasia                              |                                                                          |      2  3.0|
                                           |__________________________________________________________________________|____________|
   Lymph Node, Mesenteric                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Hemorrhage                           |                                        1  1                              |      3  1.0|
      Hyperplasia, Lymphoid                |                   2                             3     3  2  2  2     2   |     15  2.1|
      Pigmentation                         | 3        2  2  2  3  2  3  3  2  2     3  3        2  3  2     2  2     2|     33  2.4|
                                           |__________________________________________________________________________|____________|
   Spleen                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Hematopoietic Cell Proliferation     | 2     2  2  2  1  2     1           1  2  3     4  2  2        4        2|     29  2.0|
      Pigmentation                         |       2  2     3  2     2     2  3  2  3  2  2     2     2  3  2  3  3  2|     35  2.3|
                                           |__________________________________________________________________________|____________|
   Thymus                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
 _____________________________________________________________________________________________________________________|            |
 INTEGUMENTARY SYSTEM                      |                                                                          |            |
                                           |__________________________________________________________________________|____________|
   Mammary Gland                           | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Hyperplasia                          | 4  3  3  2  4  3  3  2  3  2  3  3  2  1  2  3  3  1  3  2  2  4  2  1  3|     48  2.5|
                                           |__________________________________________________________________________|____________|
   Skin                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
 _____________________________________________________________________________________________________________________|            |
 MUSCULOSKELETAL SYSTEM                    |                                                                          |            |
                                           |__________________________________________________________________________|____________|
 _____________________________________________________________________________________________________________________|____________|
                                                                                                                                    
  * : Total animals with tissue examined microscopically; total animals with lesion and mean severity grade                         
  + : Tissue examined microscopically                M : Missing tissue                        1-4 : Lesion qualified as:           
  X : Lesion present but not qualified               A : Autolysis precludes examination               1) Minimal  3) Moderate      
  I : Insufficient tissue                        BLANK : Not examined                                  2) Mild     4) Marked        
                                                                                                                                    
                                                             Page  33                                                               
                                                                                                                                   
NTP Experiment-Test: 93023-06                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09  
Study Type: CHRONIC                                           2,4-HEXADIENAL                                      Date: 03/14/01    
Route: GAVAGE                                                                                                     Time: 15:02:06    
 __________________________________________________________________________________________________________________________________ 
                                           | 7| 7| 7| 7| 7| 7| 7| 5| 7| 7| 7| 7| 7| 6| 7| 7| 5| 7| 7| 7| 7| 6| 7| 7| 7|            |
                             DAY ON TEST   | 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 1| 3| 3| 4| 3| 3| 3| 3| 0| 3| 3| 3|            |
                                           | 4| 4| 4| 4| 4| 4| 4| 6| 4| 4| 4| 4| 4| 0| 4| 2| 4| 2| 2| 2| 3| 2| 3| 4| 4|            |
 __________________________________________|__________________________________________________________________________|      T (*) |
                                           | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|      O     |
   FISCHER 344 RATS FEMALE                 | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|      T     |
                               ANIMAL ID   | 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3|      A     |
    45                                     | 2| 2| 2| 2| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 5|      L     |
    MG/KG/DY                               | 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0|            |
 _____________________________________________________________________________________________________________________|____________|
 MUSCULOSKELETAL SYSTEM - cont             |                                                                          |            |
   Bone                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
 _____________________________________________________________________________________________________________________|            |
 NERVOUS SYSTEM                            |                                                                          |            |
                                           |__________________________________________________________________________|____________|
   Brain                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Compression                          |                                        4                       2         |      6  2.7|
      Hydrocephalus                        |                2                       3                                 |      2  2.5|
 _____________________________________________________________________________________________________________________|            |
 RESPIRATORY SYSTEM                        |                                                                          |            |
                                           |__________________________________________________________________________|____________|
   Lung                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Congestion                           |                                                                          |      2  2.5|
      Edema                                |                      2                                                   |      3  2.3|
      Foreign Body                         |                                                                         X|      1     |
      Hemorrhage                           |                                                                          |      1  1.0|
      Infiltration Cellular, Histiocyte    | 2     2  1     1  1     1  1  3  2  1     3  2  1  1  2  2  1  1  1  1  1|     41  1.4|
      Inflammation, Granulomatous          |                                                                         3|      1  3.0|
      Alveolar Epithelium, Hyperplasia     |                   2           2                                          |      7  2.4|
                                           |__________________________________________________________________________|____________|
   Nose                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Foreign Body                         |                                                             X            |      3     |
      Inflammation, Chronic                |                            1                 3                           |      4  1.5|
      Respiratory Epithelium, Hyperplasia  |                            1                 2                           |      3  1.7|
                                           |__________________________________________________________________________|____________|
   Trachea                                 | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
 _____________________________________________________________________________________________________________________|            |
 SPECIAL SENSES SYSTEM                     |                                                                          |            |
                                           |__________________________________________________________________________|____________|
   Eye                                     |                                                       +                  |   3        |
      Cataract                             |                                                       3                  |      3  3.3|
      Retina, Degeneration                 |                                                       4                  |      3  4.0|
 _____________________________________________________________________________________________________________________|            |
 URINARY SYSTEM                            |                                                                          |            |
                                           |__________________________________________________________________________|____________|
 _____________________________________________________________________________________________________________________|____________|
                                                                                                                                    
  * : Total animals with tissue examined microscopically; total animals with lesion and mean severity grade                         
  + : Tissue examined microscopically                M : Missing tissue                        1-4 : Lesion qualified as:           
  X : Lesion present but not qualified               A : Autolysis precludes examination               1) Minimal  3) Moderate      
  I : Insufficient tissue                        BLANK : Not examined                                  2) Mild     4) Marked        
                                                                                                                                    
                                                             Page  34                                                               
                                                                                                                                   
NTP Experiment-Test: 93023-06                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09  
Study Type: CHRONIC                                           2,4-HEXADIENAL                                      Date: 03/14/01    
Route: GAVAGE                                                                                                     Time: 15:02:06    
 __________________________________________________________________________________________________________________________________ 
                                           | 7| 7| 7| 7| 7| 7| 7| 5| 7| 7| 7| 7| 7| 6| 7| 7| 5| 7| 7| 7| 7| 6| 7| 7| 7|            |
                             DAY ON TEST   | 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 1| 3| 3| 4| 3| 3| 3| 3| 0| 3| 3| 3|            |
                                           | 4| 4| 4| 4| 4| 4| 4| 6| 4| 4| 4| 4| 4| 0| 4| 2| 4| 2| 2| 2| 3| 2| 3| 4| 4|            |
 __________________________________________|__________________________________________________________________________|      T (*) |
                                           | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|      O     |
   FISCHER 344 RATS FEMALE                 | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|      T     |
                               ANIMAL ID   | 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3|      A     |
    45                                     | 2| 2| 2| 2| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 5|      L     |
    MG/KG/DY                               | 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0|            |
 _____________________________________________________________________________________________________________________|____________|
 URINARY SYSTEM - cont                     |                                                                          |            |
   Kidney                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Nephropathy                          |             3                          1                 1               |      6  1.3|
      Renal Tubule, Cytoplasmic Alteration |             2                 3        2                       2         |      5  2.2|
      Renal Tubule, Dilatation             |                                                                2         |      1  2.0|
      Renal Tubule, Pigmentation           |             2                          1                       1         |      3  1.3|
      Transitional Epithelium, Hyperplasia |                   1                                                      |      1  1.0|
                                           |__________________________________________________________________________|____________|
   Urinary Bladder                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
 __________________________________________________________________________________________________________________________________ 
                                                                                                                                    
  * : Total animals with tissue examined microscopically; total animals with lesion and mean severity grade                         
  + : Tissue examined microscopically                M : Missing tissue                        1-4 : Lesion qualified as:           
  X : Lesion present but not qualified               A : Autolysis precludes examination               1) Minimal  3) Moderate      
  I : Insufficient tissue                        BLANK : Not examined                                  2) Mild     4) Marked        
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                             Page  35                                                               
                                                                                                                                   
NTP Experiment-Test: 93023-06                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09  
Study Type: CHRONIC                                           2,4-HEXADIENAL                                      Date: 03/14/01    
Route: GAVAGE                                                                                                     Time: 15:02:06    
 _____________________________________________________________________________________________________________________              
                                           | 7| 7| 6| 7| 4| 7| 7| 6| 7| 7| 7| 7| 7| 7| 6| 5| 3| 7| 3| 7| 6| 7| 7| 7| 6|             
                             DAY ON TEST   | 3| 3| 5| 3| 0| 2| 2| 9| 2| 2| 3| 3| 3| 3| 3| 3| 6| 3| 6| 3| 3| 3| 3| 3| 9|             
                                           | 5| 5| 1| 5| 5| 9| 9| 1| 9| 9| 2| 3| 3| 3| 1| 6| 4| 2| 3| 2| 8| 2| 2| 2| 1|             
 __________________________________________|__________________________________________________________________________|             
                                           | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|             
   FISCHER 344 RATS FEMALE                 | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|             
                               ANIMAL ID   | 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3|             
    90                                     | 5| 5| 5| 5| 5| 5| 5| 5| 5| 6| 6| 6| 6| 6| 6| 6| 6| 6| 6| 7| 7| 7| 7| 7| 7|             
    MG/KG/DY                               | 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5|             
 __________________________________________|__________________________________________________________________________|             
 ALIMENTARY SYSTEM                         |                                                                          |             
                                           |__________________________________________________________________________|             
   Esophagus                               | +  +  +  +  +  +  +  +  +  +  +  M  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Inflammation, Chronic                |                                                 3                        |             
      Perforation                          |                                                                          |             
                                           |__________________________________________________________________________|             
   Intestine Large, Colon                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                           |__________________________________________________________________________|             
   Intestine Large, Rectum                 | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                           |__________________________________________________________________________|             
   Intestine Large, Cecum                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Edema                                |                                              2                          3|             
                                           |__________________________________________________________________________|             
   Intestine Small, Duodenum               | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                           |__________________________________________________________________________|             
   Intestine Small, Jejunum                | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  A  +  +  +  +  +  +  +  +|             
                                           |__________________________________________________________________________|             
   Intestine Small, Ileum                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                           |__________________________________________________________________________|             
   Liver                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Angiectasis                          |    2                                            4                        |             
      Basophilic Focus                     | X  X  X  X     X  X  X  X  X  X  X  X  X     X  X  X  X  X  X  X  X  X   |             
      Clear Cell Focus                     |       X  X                                                               |             
      Eosinophilic Focus                   |                   X        X                                             |             
      Hepatodiaphragmatic Nodule           |                X                       X                 X               |             
      Infiltration Cellular, Mixed Cell    | 1  4  2  3                 1                    3  3  1  2  2            |             
      Mixed Cell Focus                     |                X           X        X                             X      |             
      Bile Duct, Hyperplasia               |                                                                         3|             
      Hepatocyte, Cytomegaly               |                                                                         2|             
      Hepatocyte, Necrosis                 |                                                    2     2               |             
      Hepatocyte, Vacuolization Cytoplasmic|                                                                         3|             
      Kupffer Cell, Pigmentation           |                                                                         3|             
                                           |__________________________________________________________________________|             
   Mesentery                               |                   +  +     +        +        +                 +     +   |             
      Fat, Necrosis                        |                   4  3     4        3        3                 3     2   |             
                                           |__________________________________________________________________________|             
   Pancreas                                | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Atrophy                              | 2     2                 1                          1                 1   |             
      Cyst                                 |                                                             3            |             
 __________________________________________|__________________________________________________________________________|             
                                                                                                                                    
                                                                                                                                    
                                                             Page  36                                                               
                                                                                                                                   
NTP Experiment-Test: 93023-06                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09  
Study Type: CHRONIC                                           2,4-HEXADIENAL                                      Date: 03/14/01    
Route: GAVAGE                                                                                                     Time: 15:02:06    
 _____________________________________________________________________________________________________________________              
                                           | 7| 7| 6| 7| 4| 7| 7| 6| 7| 7| 7| 7| 7| 7| 6| 5| 3| 7| 3| 7| 6| 7| 7| 7| 6|             
                             DAY ON TEST   | 3| 3| 5| 3| 0| 2| 2| 9| 2| 2| 3| 3| 3| 3| 3| 3| 6| 3| 6| 3| 3| 3| 3| 3| 9|             
                                           | 5| 5| 1| 5| 5| 9| 9| 1| 9| 9| 2| 3| 3| 3| 1| 6| 4| 2| 3| 2| 8| 2| 2| 2| 1|             
 __________________________________________|__________________________________________________________________________|             
                                           | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|             
   FISCHER 344 RATS FEMALE                 | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|             
                               ANIMAL ID   | 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3|             
    90                                     | 5| 5| 5| 5| 5| 5| 5| 5| 5| 6| 6| 6| 6| 6| 6| 6| 6| 6| 6| 7| 7| 7| 7| 7| 7|             
    MG/KG/DY                               | 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5|             
 __________________________________________|__________________________________________________________________________|             
 ALIMENTARY SYSTEM - cont                  |                                                                          |             
      Acinus, Cytoplasmic Alteration       |                                                             3            |             
      Acinus, Hyperplasia, Focal           |                   2                                                      |             
                                           |__________________________________________________________________________|             
   Salivary Glands                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Atrophy                              |                                                             3  2        3|             
                                           |__________________________________________________________________________|             
   Stomach, Forestomach                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Edema                                |                                              2                          3|             
      Inflammation, Chronic Active         |                                                                      2  3|             
      Ulcer                                |                                                                         3|             
      Epithelium, Cyst                     |                                                                          |             
      Epithelium, Hyperplasia              | 3  3  2  3  1  3  3  1  3  3  2  3  2  3  3        2     2  3  2  3  2  3|             
                                           |__________________________________________________________________________|             
   Stomach, Glandular                      | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Erosion                              |                                                                          |             
      Ulcer                                |                                                             3            |             
                                           |__________________________________________________________________________|             
   Tongue                                  |                                                                          |             
 _____________________________________________________________________________________________________________________|             
 CARDIOVASCULAR SYSTEM                     |                                                                          |             
                                           |__________________________________________________________________________|             
   Heart                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Cardiomyopathy                       |    3           2  1     1  1        1           1                       1|             
 _____________________________________________________________________________________________________________________|             
 ENDOCRINE SYSTEM                          |                                                                          |             
                                           |__________________________________________________________________________|             
   Adrenal Cortex                          | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Accessory Adrenal Cortical Nodule    | 3  3           3        3                                   3     3      |             
      Angiectasis                          |                                                                          |             
      Degeneration, Fatty                  |    1              1                       3                 2           3|             
      Hyperplasia, Diffuse                 |                                     2                                    |             
      Hyperplasia, Focal                   |                                                                2  1      |             
      Hypertrophy, Focal                   |    2  3                                                                  |             
      Necrosis                             |                                                             2            |             
                                           |__________________________________________________________________________|             
   Adrenal Medulla                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Hyperplasia                          |                                                                          |             
                                           |__________________________________________________________________________|             
 __________________________________________|__________________________________________________________________________|             
                                                                                                                                    
                                                                                                                                    
                                                             Page  37                                                               
                                                                                                                                   
NTP Experiment-Test: 93023-06                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09  
Study Type: CHRONIC                                           2,4-HEXADIENAL                                      Date: 03/14/01    
Route: GAVAGE                                                                                                     Time: 15:02:06    
 _____________________________________________________________________________________________________________________              
                                           | 7| 7| 6| 7| 4| 7| 7| 6| 7| 7| 7| 7| 7| 7| 6| 5| 3| 7| 3| 7| 6| 7| 7| 7| 6|             
                             DAY ON TEST   | 3| 3| 5| 3| 0| 2| 2| 9| 2| 2| 3| 3| 3| 3| 3| 3| 6| 3| 6| 3| 3| 3| 3| 3| 9|             
                                           | 5| 5| 1| 5| 5| 9| 9| 1| 9| 9| 2| 3| 3| 3| 1| 6| 4| 2| 3| 2| 8| 2| 2| 2| 1|             
 __________________________________________|__________________________________________________________________________|             
                                           | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|             
   FISCHER 344 RATS FEMALE                 | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|             
                               ANIMAL ID   | 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3|             
    90                                     | 5| 5| 5| 5| 5| 5| 5| 5| 5| 6| 6| 6| 6| 6| 6| 6| 6| 6| 6| 7| 7| 7| 7| 7| 7|             
    MG/KG/DY                               | 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5|             
 __________________________________________|__________________________________________________________________________|             
 ENDOCRINE SYSTEM - cont                   |                                                                          |             
   Islets, Pancreatic                      | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                           |__________________________________________________________________________|             
   Parathyroid Gland                       | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  M|             
                                           |__________________________________________________________________________|             
   Pituitary Gland                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Pars Distalis, Angiectasis           |                                                                          |             
      Pars Distalis, Cyst                  |    3           3  3                    3     3     3        3           3|             
      Pars Distalis, Hyperplasia, Focal    |                            3                 3     2                     |             
                                           |__________________________________________________________________________|             
   Thyroid Gland                           | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Ultimobranchial Cyst                 |                                                                          |             
      C-Cell, Hyperplasia                  | 1                    1     2  3        1                 1     1         |             
      Follicular Cell, Hyperplasia         |                                           2                              |             
 _____________________________________________________________________________________________________________________|             
 GENERAL BODY SYSTEM                       |                                                                          |             
    None                                   |                                                                          |             
 _____________________________________________________________________________________________________________________|             
 GENITAL SYSTEM                            |                                                                          |             
                                           |__________________________________________________________________________|             
   Clitoral Gland                          | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Cyst                                 |                                                                          |             
      Hyperplasia                          |                                                                          |             
      Inflammation, Chronic                |    3                                2                                    |             
                                           |__________________________________________________________________________|             
   Ovary                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Cyst                                 |          3        3                          3     4                     |             
                                           |__________________________________________________________________________|             
   Uterus                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Hydrometra                           |                                                                          |             
      Hyperplasia, Cystic                  |                                  2                                       |             
      Inflammation, Chronic                |                                                                1         |             
                                           |__________________________________________________________________________|             
   Vagina                                  |                                                             +            |             
 _____________________________________________________________________________________________________________________|             
 HEMATOPOIETIC SYSTEM                      |                                                                          |             
                                           |__________________________________________________________________________|             
   Bone Marrow                             | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Hyperplasia                          |    3                                                                     |             
 __________________________________________|__________________________________________________________________________|             
                                                                                                                                    
                                                                                                                                    
                                                             Page  38                                                               
                                                                                                                                   
NTP Experiment-Test: 93023-06                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09  
Study Type: CHRONIC                                           2,4-HEXADIENAL                                      Date: 03/14/01    
Route: GAVAGE                                                                                                     Time: 15:02:06    
 _____________________________________________________________________________________________________________________              
                                           | 7| 7| 6| 7| 4| 7| 7| 6| 7| 7| 7| 7| 7| 7| 6| 5| 3| 7| 3| 7| 6| 7| 7| 7| 6|             
                             DAY ON TEST   | 3| 3| 5| 3| 0| 2| 2| 9| 2| 2| 3| 3| 3| 3| 3| 3| 6| 3| 6| 3| 3| 3| 3| 3| 9|             
                                           | 5| 5| 1| 5| 5| 9| 9| 1| 9| 9| 2| 3| 3| 3| 1| 6| 4| 2| 3| 2| 8| 2| 2| 2| 1|             
 __________________________________________|__________________________________________________________________________|             
                                           | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|             
   FISCHER 344 RATS FEMALE                 | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|             
                               ANIMAL ID   | 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3|             
    90                                     | 5| 5| 5| 5| 5| 5| 5| 5| 5| 6| 6| 6| 6| 6| 6| 6| 6| 6| 6| 7| 7| 7| 7| 7| 7|             
    MG/KG/DY                               | 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5|             
 __________________________________________|__________________________________________________________________________|             
 HEMATOPOIETIC SYSTEM - cont               |                                                                          |             
                                           |__________________________________________________________________________|             
   Lymph Node                              | +  +  +  +        +  +  +  +        +  +  +  +     +     +  +  +  +  +  +|             
      Deep Cervical, Hemorrhage            |                                     3                                    |             
      Deep Cervical, Hyperplasia, Lymphoid |                                     2                                    |             
      Deep Cervical, Pigmentation          |                                     3                                    |             
      Mediastinal, Hemorrhage              |                                     1                                    |             
      Mediastinal, Hyperplasia, Lymphoid   |                                     2                                    |             
      Mediastinal, Pigmentation            |                         3                                         2      |             
      Pancreatic, Hemorrhage               |    1                       1           2           1        1  2        3|             
      Pancreatic, Hyperplasia, Lymphoid    |    3  3  1        3     3  3        3  3           3     3  3  3  3  1  2|             
      Pancreatic, Pigmentation             | 1  3  3  1        2     3  1        2  2  1        2     3  2  2  1  2  2|             
                                           |__________________________________________________________________________|             
   Lymph Node, Mandibular                  | M  M  M  M  M  M  M  M  M  M  +  M  M  M  M  M  M  M  M  M  M  M  M  M  M|             
                                           |__________________________________________________________________________|             
   Lymph Node, Mesenteric                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Hemorrhage                           |                                              3              2            |             
      Hyperplasia, Lymphoid                |             2                 2  3              2     2        2     2   |             
      Pigmentation                         | 3  2  2        2  2     2  2  2  2  2  2     2           2  2  2  2  2  2|             
                                           |__________________________________________________________________________|             
   Spleen                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Fibrosis                             |          2                                                              3|             
      Hematopoietic Cell Proliferation     |    3              1        2  2              1           1     2     1   |             
      Infiltration Cellular, Mixed Cell    |    4                                                                     |             
      Pigmentation                         | 2        2  3  3  2        2  3  3  3  3        3  3  2  2  3  2        2|             
      Lymphoid Follicle, Atrophy           |                                                 3           3            |             
      Lymphoid Follicle, Hyperplasia       |                                              3                           |             
                                           |__________________________________________________________________________|             
   Thymus                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
 _____________________________________________________________________________________________________________________|             
 INTEGUMENTARY SYSTEM                      |                                                                          |             
                                           |__________________________________________________________________________|             
   Mammary Gland                           | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Hyperplasia                          | 2  3  2  3     1  2  2  3  2  4  2  4  2  2  3     2     4     2  3  2  4|             
                                           |__________________________________________________________________________|             
   Skin                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Inflammation, Chronic                |                                                             3            |             
      Subcutaneous Tissue, Edema           |                                                             3            |             
 __________________________________________|__________________________________________________________________________|             
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                             Page  39                                                               
                                                                                                                                   
NTP Experiment-Test: 93023-06                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09  
Study Type: CHRONIC                                           2,4-HEXADIENAL                                      Date: 03/14/01    
Route: GAVAGE                                                                                                     Time: 15:02:06    
 _____________________________________________________________________________________________________________________              
                                           | 7| 7| 6| 7| 4| 7| 7| 6| 7| 7| 7| 7| 7| 7| 6| 5| 3| 7| 3| 7| 6| 7| 7| 7| 6|             
                             DAY ON TEST   | 3| 3| 5| 3| 0| 2| 2| 9| 2| 2| 3| 3| 3| 3| 3| 3| 6| 3| 6| 3| 3| 3| 3| 3| 9|             
                                           | 5| 5| 1| 5| 5| 9| 9| 1| 9| 9| 2| 3| 3| 3| 1| 6| 4| 2| 3| 2| 8| 2| 2| 2| 1|             
 __________________________________________|__________________________________________________________________________|             
                                           | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|             
   FISCHER 344 RATS FEMALE                 | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|             
                               ANIMAL ID   | 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3|             
    90                                     | 5| 5| 5| 5| 5| 5| 5| 5| 5| 6| 6| 6| 6| 6| 6| 6| 6| 6| 6| 7| 7| 7| 7| 7| 7|             
    MG/KG/DY                               | 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5|             
 __________________________________________|__________________________________________________________________________|             
 MUSCULOSKELETAL SYSTEM                    |                                                                          |             
                                           |__________________________________________________________________________|             
   Bone                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
 _____________________________________________________________________________________________________________________|             
 NERVOUS SYSTEM                            |                                                                          |             
                                           |__________________________________________________________________________|             
   Brain                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Compression                          |                      2              4     4                              |             
      Hydrocephalus                        |                                                                          |             
 _____________________________________________________________________________________________________________________|             
 RESPIRATORY SYSTEM                        |                                                                          |             
                                           |__________________________________________________________________________|             
   Lung                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Congestion                           |             3                                   2                        |             
      Edema                                |             2                                   3     2                  |             
      Hemorrhage                           |                2                                      4                  |             
      Infiltration Cellular, Histiocyte    | 2  1  1  2     1  1  2  1  1  2  1  1  2  3     2  2     2  1  2  2  2  1|             
      Alveolar Epithelium, Hyperplasia     | 2              3              1  3                          2            |             
                                           |__________________________________________________________________________|             
   Nose                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Foreign Body                         |                                                                          |             
      Inflammation, Chronic                |                         2                 2              1               |             
                                           |__________________________________________________________________________|             
   Trachea                                 | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
 _____________________________________________________________________________________________________________________|             
 SPECIAL SENSES SYSTEM                     |                                                                          |             
                                           |__________________________________________________________________________|             
   Eye                                     | +                                                                        |             
      Cataract                             | 3                                                                        |             
      Retina, Degeneration                 | 4                                                                        |             
 _____________________________________________________________________________________________________________________|             
 URINARY SYSTEM                            |                                                                          |             
                                           |__________________________________________________________________________|             
   Kidney                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Cyst                                 |                                                                          |             
      Hydronephrosis                       |                                                          2               |             
      Nephropathy                          |                                     1                    1        1      |             
      Renal Tubule, Cytoplasmic Alteration |                                     2                             2      |             
      Renal Tubule, Infarct                |                                     4                                    |             
 __________________________________________|__________________________________________________________________________|             
                                                                                                                                    
                                                                                                                                    
                                                             Page  40                                                               
                                                                                                                                   
NTP Experiment-Test: 93023-06                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09  
Study Type: CHRONIC                                           2,4-HEXADIENAL                                      Date: 03/14/01    
Route: GAVAGE                                                                                                     Time: 15:02:06    
 _____________________________________________________________________________________________________________________              
                                           | 7| 7| 6| 7| 4| 7| 7| 6| 7| 7| 7| 7| 7| 7| 6| 5| 3| 7| 3| 7| 6| 7| 7| 7| 6|             
                             DAY ON TEST   | 3| 3| 5| 3| 0| 2| 2| 9| 2| 2| 3| 3| 3| 3| 3| 3| 6| 3| 6| 3| 3| 3| 3| 3| 9|             
                                           | 5| 5| 1| 5| 5| 9| 9| 1| 9| 9| 2| 3| 3| 3| 1| 6| 4| 2| 3| 2| 8| 2| 2| 2| 1|             
 __________________________________________|__________________________________________________________________________|             
                                           | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|             
   FISCHER 344 RATS FEMALE                 | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|             
                               ANIMAL ID   | 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3|             
    90                                     | 5| 5| 5| 5| 5| 5| 5| 5| 5| 6| 6| 6| 6| 6| 6| 6| 6| 6| 6| 7| 7| 7| 7| 7| 7|             
    MG/KG/DY                               | 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5|             
 __________________________________________|__________________________________________________________________________|             
 URINARY SYSTEM - cont                     |                                                                          |             
      Renal Tubule, Necrosis               |                                                             2            |             
      Renal Tubule, Pigmentation           |       2  2           2                                      2            |             
      Transitional Epithelium, Hyperplasia |                                                                         2|             
                                           |__________________________________________________________________________|             
   Urinary Bladder                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
 __________________________________________|__________________________________________________________________________              
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                             Page  41                                                               
                                                                                                                                   
NTP Experiment-Test: 93023-06                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09  
Study Type: CHRONIC                                           2,4-HEXADIENAL                                      Date: 03/14/01    
Route: GAVAGE                                                                                                     Time: 15:02:06    
 __________________________________________________________________________________________________________________________________ 
                                           | 6| 7| 7| 7| 7| 3| 7| 7| 4| 6| 7| 7| 7| 7| 7| 7| 6| 7| 5| 3| 6| 3| 7| 7| 7|            |
                             DAY ON TEST   | 9| 3| 3| 3| 3| 6| 2| 3| 4| 6| 2| 2| 2| 2| 2| 3| 0| 3| 6| 4| 3| 6| 3| 3| 3|            |
                                           | 0| 4| 4| 4| 4| 4| 1| 3| 5| 6| 9| 9| 9| 9| 9| 4| 1| 4| 0| 6| 6| 4| 5| 5| 5|            |
 __________________________________________|__________________________________________________________________________|      T (*) |
                                           | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|      O     |
   FISCHER 344 RATS FEMALE                 | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|      T     |
                               ANIMAL ID   | 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 4|      A     |
    90                                     | 7| 7| 7| 7| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 0|      L     |
    MG/KG/DY                               | 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0|            |
 _____________________________________________________________________________________________________________________|____________|
 ALIMENTARY SYSTEM                         |                                                                          |            |
                                           |__________________________________________________________________________|____________|
   Esophagus                               | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  M  +  +  +  +  +|  48        |
      Inflammation, Chronic                |                                                                          |      1  3.0|
      Perforation                          |                                                                X         |      1     |
                                           |__________________________________________________________________________|____________|
   Intestine Large, Colon                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
                                           |__________________________________________________________________________|____________|
   Intestine Large, Rectum                 | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  I  +|  49        |
                                           |__________________________________________________________________________|____________|
   Intestine Large, Cecum                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Edema                                |                                                                          |      2  2.5|
                                           |__________________________________________________________________________|____________|
   Intestine Small, Duodenum               | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
                                           |__________________________________________________________________________|____________|
   Intestine Small, Jejunum                | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  49        |
                                           |__________________________________________________________________________|____________|
   Intestine Small, Ileum                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
                                           |__________________________________________________________________________|____________|
   Liver                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Angiectasis                          |                                                                          |      2  3.0|
      Basophilic Focus                     |       X  X  X  X  X  X  X  X  X  X  X  X  X  X  X  X  X  X  X  X  X  X  X|     45     |
      Clear Cell Focus                     |                         X                                            X   |      4     |
      Eosinophilic Focus                   |          X                                                              X|      4     |
      Hepatodiaphragmatic Nodule           |                      X                                                   |      4     |
      Infiltration Cellular, Mixed Cell    |          2                             1     1     3  1           2  2   |     17  2.0|
      Mixed Cell Focus                     |    X     X                    X  X                    X                  |      9     |
      Bile Duct, Hyperplasia               |                                                                          |      1  3.0|
      Hepatocyte, Cytomegaly               |                                                                          |      1  2.0|
      Hepatocyte, Necrosis                 | 3                                                                        |      3  2.3|
      Hepatocyte, Vacuolization Cytoplasmic|                                                                          |      1  3.0|
      Kupffer Cell, Pigmentation           |                                                                          |      1  3.0|
                                           |__________________________________________________________________________|____________|
   Mesentery                               |                      +  +     +        +  +           +        +     +   |  15        |
      Fat, Necrosis                        |                      3  3     3        3  3           2        4     3   |     15  3.1|
 _____________________________________________________________________________________________________________________|____________|
                                                                                                                                    
  * : Total animals with tissue examined microscopically; total animals with lesion and mean severity grade                         
  + : Tissue examined microscopically                M : Missing tissue                        1-4 : Lesion qualified as:           
  X : Lesion present but not qualified               A : Autolysis precludes examination               1) Minimal  3) Moderate      
  I : Insufficient tissue                        BLANK : Not examined                                  2) Mild     4) Marked        
                                                                                                                                    
                                                             Page  42                                                               
                                                                                                                                   
NTP Experiment-Test: 93023-06                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09  
Study Type: CHRONIC                                           2,4-HEXADIENAL                                      Date: 03/14/01    
Route: GAVAGE                                                                                                     Time: 15:02:06    
 __________________________________________________________________________________________________________________________________ 
                                           | 6| 7| 7| 7| 7| 3| 7| 7| 4| 6| 7| 7| 7| 7| 7| 7| 6| 7| 5| 3| 6| 3| 7| 7| 7|            |
                             DAY ON TEST   | 9| 3| 3| 3| 3| 6| 2| 3| 4| 6| 2| 2| 2| 2| 2| 3| 0| 3| 6| 4| 3| 6| 3| 3| 3|            |
                                           | 0| 4| 4| 4| 4| 4| 1| 3| 5| 6| 9| 9| 9| 9| 9| 4| 1| 4| 0| 6| 6| 4| 5| 5| 5|            |
 __________________________________________|__________________________________________________________________________|      T (*) |
                                           | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|      O     |
   FISCHER 344 RATS FEMALE                 | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|      T     |
                               ANIMAL ID   | 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 4|      A     |
    90                                     | 7| 7| 7| 7| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 0|      L     |
    MG/KG/DY                               | 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0|            |
 _____________________________________________________________________________________________________________________|____________|
 ALIMENTARY SYSTEM - cont                  |                                                                          |            |
                                           |__________________________________________________________________________|____________|
   Pancreas                                | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Atrophy                              |                                        3     1  3                        |      8  1.8|
      Cyst                                 |                         3                                      3         |      3  3.0|
      Acinus, Cytoplasmic Alteration       |                                                             3            |      2  3.0|
      Acinus, Hyperplasia, Focal           |                                                                          |      1  2.0|
                                           |__________________________________________________________________________|____________|
   Salivary Glands                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Atrophy                              |                                              2                           |      4  2.5|
                                           |__________________________________________________________________________|____________|
   Stomach, Forestomach                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Edema                                |                                                                          |      2  2.5|
      Inflammation, Chronic Active         |                                                                          |      2  2.5|
      Ulcer                                |                                                                          |      1  3.0|
      Epithelium, Cyst                     |                                        3                                 |      1  3.0|
      Epithelium, Hyperplasia              | 1  2  3  3  2        3        3  3  3  3  3  3     2  1  1  2     3  3  3|     41  2.5|
                                           |__________________________________________________________________________|____________|
   Stomach, Glandular                      | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Erosion                              | 3                                                                        |      1  3.0|
      Ulcer                                |                                                                          |      1  3.0|
                                           |__________________________________________________________________________|____________|
   Tongue                                  |                                              +                           |   1        |
 _____________________________________________________________________________________________________________________|            |
 CARDIOVASCULAR SYSTEM                     |                                                                          |            |
                                           |__________________________________________________________________________|____________|
   Heart                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Cardiomyopathy                       |          1           1        1  1                          1            |     13  1.2|
 _____________________________________________________________________________________________________________________|            |
 ENDOCRINE SYSTEM                          |                                                                          |            |
                                           |__________________________________________________________________________|____________|
   Adrenal Cortex                          | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Accessory Adrenal Cortical Nodule    |       3        3              3  3     3                       3        3|     13  3.0|
      Angiectasis                          |                                     3                                   3|      2  3.0|
      Degeneration, Fatty                  |       1           3  1                       2                    1     3|     11  1.9|
 _____________________________________________________________________________________________________________________|____________|
                                                                                                                                    
  * : Total animals with tissue examined microscopically; total animals with lesion and mean severity grade                         
  + : Tissue examined microscopically                M : Missing tissue                        1-4 : Lesion qualified as:           
  X : Lesion present but not qualified               A : Autolysis precludes examination               1) Minimal  3) Moderate      
  I : Insufficient tissue                        BLANK : Not examined                                  2) Mild     4) Marked        
                                                                                                                                    
                                                             Page  43                                                               
                                                                                                                                   
NTP Experiment-Test: 93023-06                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09  
Study Type: CHRONIC                                           2,4-HEXADIENAL                                      Date: 03/14/01    
Route: GAVAGE                                                                                                     Time: 15:02:06    
 __________________________________________________________________________________________________________________________________ 
                                           | 6| 7| 7| 7| 7| 3| 7| 7| 4| 6| 7| 7| 7| 7| 7| 7| 6| 7| 5| 3| 6| 3| 7| 7| 7|            |
                             DAY ON TEST   | 9| 3| 3| 3| 3| 6| 2| 3| 4| 6| 2| 2| 2| 2| 2| 3| 0| 3| 6| 4| 3| 6| 3| 3| 3|            |
                                           | 0| 4| 4| 4| 4| 4| 1| 3| 5| 6| 9| 9| 9| 9| 9| 4| 1| 4| 0| 6| 6| 4| 5| 5| 5|            |
 __________________________________________|__________________________________________________________________________|      T (*) |
                                           | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|      O     |
   FISCHER 344 RATS FEMALE                 | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|      T     |
                               ANIMAL ID   | 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 4|      A     |
    90                                     | 7| 7| 7| 7| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 0|      L     |
    MG/KG/DY                               | 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0|            |
 _____________________________________________________________________________________________________________________|____________|
 ENDOCRINE SYSTEM - cont                   |                                                                          |            |
      Hyperplasia, Diffuse                 |                                                                          |      1  2.0|
      Hyperplasia, Focal                   |                                        2                                1|      4  1.5|
      Hypertrophy, Focal                   |                   3                                               1     3|      5  2.4|
      Necrosis                             | 2                                                                        |      2  2.0|
                                           |__________________________________________________________________________|____________|
   Adrenal Medulla                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Hyperplasia                          |    1                                                                     |      1  1.0|
                                           |__________________________________________________________________________|____________|
   Islets, Pancreatic                      | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
                                           |__________________________________________________________________________|____________|
   Parathyroid Gland                       | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  M  +  +  +  +  +  M  +  +  +|  47        |
                                           |__________________________________________________________________________|____________|
   Pituitary Gland                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Pars Distalis, Angiectasis           |       3        2                                                         |      2  2.5|
      Pars Distalis, Cyst                  | 3                          3     3  3  3        3                 3      |     15  3.0|
      Pars Distalis, Hyperplasia, Focal    |                2           3     2                 2              2     2|      9  2.3|
                                           |__________________________________________________________________________|____________|
   Thyroid Gland                           | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Ultimobranchial Cyst                 |    3                                                     3               |      2  3.0|
      C-Cell, Hyperplasia                  | 2     1                       2  1        1                       1  2   |     14  1.4|
      Follicular Cell, Hyperplasia         |                                                                          |      1  2.0|
 _____________________________________________________________________________________________________________________|            |
 GENERAL BODY SYSTEM                       |                                                                          |            |
    None                                   |                                                                          |            |
 _____________________________________________________________________________________________________________________|            |
 GENITAL SYSTEM                            |                                                                          |            |
                                           |__________________________________________________________________________|____________|
   Clitoral Gland                          | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Cyst                                 | 3                                                                 3      |      2  3.0|
      Hyperplasia                          |       2                                                                  |      1  2.0|
      Inflammation, Chronic                |                               2                    2                 2   |      5  2.2|
                                           |__________________________________________________________________________|____________|
   Ovary                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Cyst                                 |             3        3        4                             3        4   |      9  3.3|
 _____________________________________________________________________________________________________________________|____________|
                                                                                                                                    
  * : Total animals with tissue examined microscopically; total animals with lesion and mean severity grade                         
  + : Tissue examined microscopically                M : Missing tissue                        1-4 : Lesion qualified as:           
  X : Lesion present but not qualified               A : Autolysis precludes examination               1) Minimal  3) Moderate      
  I : Insufficient tissue                        BLANK : Not examined                                  2) Mild     4) Marked        
                                                                                                                                    
                                                             Page  44                                                               
                                                                                                                                   
NTP Experiment-Test: 93023-06                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09  
Study Type: CHRONIC                                           2,4-HEXADIENAL                                      Date: 03/14/01    
Route: GAVAGE                                                                                                     Time: 15:02:06    
 __________________________________________________________________________________________________________________________________ 
                                           | 6| 7| 7| 7| 7| 3| 7| 7| 4| 6| 7| 7| 7| 7| 7| 7| 6| 7| 5| 3| 6| 3| 7| 7| 7|            |
                             DAY ON TEST   | 9| 3| 3| 3| 3| 6| 2| 3| 4| 6| 2| 2| 2| 2| 2| 3| 0| 3| 6| 4| 3| 6| 3| 3| 3|            |
                                           | 0| 4| 4| 4| 4| 4| 1| 3| 5| 6| 9| 9| 9| 9| 9| 4| 1| 4| 0| 6| 6| 4| 5| 5| 5|            |
 __________________________________________|__________________________________________________________________________|      T (*) |
                                           | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|      O     |
   FISCHER 344 RATS FEMALE                 | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|      T     |
                               ANIMAL ID   | 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 4|      A     |
    90                                     | 7| 7| 7| 7| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 0|      L     |
    MG/KG/DY                               | 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0|            |
 _____________________________________________________________________________________________________________________|____________|
 GENITAL SYSTEM - cont                     |                                                                          |            |
                                           |__________________________________________________________________________|____________|
   Uterus                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Hydrometra                           |                                        3                                3|      2  3.0|
      Hyperplasia, Cystic                  |    2     3  4                                                        2   |      5  2.6|
      Inflammation, Chronic                |                                                                   2      |      2  1.5|
                                           |__________________________________________________________________________|____________|
   Vagina                                  |                                                                          |   1        |
 _____________________________________________________________________________________________________________________|            |
 HEMATOPOIETIC SYSTEM                      |                                                                          |            |
                                           |__________________________________________________________________________|____________|
   Bone Marrow                             | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Hyperplasia                          |                         3                                                |      2  3.0|
                                           |__________________________________________________________________________|____________|
   Lymph Node                              | +  +     +  +  +  +  +  +     +  +  +  +  +  +  +  +  +           +  +   |  38        |
      Deep Cervical, Hemorrhage            |                                                                          |      1  3.0|
      Deep Cervical, Hyperplasia, Lymphoid |                                                                          |      1  2.0|
      Deep Cervical, Pigmentation          |                                                                          |      1  3.0|
      Mediastinal, Hemorrhage              |             2                                                            |      2  1.5|
      Mediastinal, Hyperplasia, Lymphoid   |             3           2                                                |      3  2.3|
      Mediastinal, Pigmentation            |             2                                                            |      3  2.3|
      Pancreatic, Hemorrhage               |          1  2        3  2        3  1  2              2           2  2   |     17  1.8|
      Pancreatic, Hyperplasia, Lymphoid    |          3  2     3  3  2     1  2  3  1  2        2  2           2      |     28  2.4|
      Pancreatic, Pigmentation             |          2  2  1  1  3  3     1  3  2  2  1        2  3           3  2   |     32  2.0|
                                           |__________________________________________________________________________|____________|
   Lymph Node, Mandibular                  | M  M  M  M  M  M  M  M  M  M  M  M  M  M  M  M  M  M  M  M  M  M  M  M  M|   1        |
                                           |__________________________________________________________________________|____________|
   Lymph Node, Mesenteric                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Hemorrhage                           |          1                 2                                             |      4  2.0|
      Hyperplasia, Lymphoid                |                2                       2           2  2  2     2         |     13  2.1|
      Pigmentation                         | 2     3  2  2        3        2  2  2  2  2  2     2        3     3  3  2|     34  2.2|
                                           |__________________________________________________________________________|____________|
   Spleen                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Fibrosis                             |                                                                          |      2  2.5|
      Hematopoietic Cell Proliferation     |       1  2  1        1  2     2  1     3  2  3                    1  2  2|     21  1.7|
 _____________________________________________________________________________________________________________________|____________|
                                                                                                                                    
  * : Total animals with tissue examined microscopically; total animals with lesion and mean severity grade                         
  + : Tissue examined microscopically                M : Missing tissue                        1-4 : Lesion qualified as:           
  X : Lesion present but not qualified               A : Autolysis precludes examination               1) Minimal  3) Moderate      
  I : Insufficient tissue                        BLANK : Not examined                                  2) Mild     4) Marked        
                                                                                                                                    
                                                             Page  45                                                               
                                                                                                                                   
NTP Experiment-Test: 93023-06                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09  
Study Type: CHRONIC                                           2,4-HEXADIENAL                                      Date: 03/14/01    
Route: GAVAGE                                                                                                     Time: 15:02:06    
 __________________________________________________________________________________________________________________________________ 
                                           | 6| 7| 7| 7| 7| 3| 7| 7| 4| 6| 7| 7| 7| 7| 7| 7| 6| 7| 5| 3| 6| 3| 7| 7| 7|            |
                             DAY ON TEST   | 9| 3| 3| 3| 3| 6| 2| 3| 4| 6| 2| 2| 2| 2| 2| 3| 0| 3| 6| 4| 3| 6| 3| 3| 3|            |
                                           | 0| 4| 4| 4| 4| 4| 1| 3| 5| 6| 9| 9| 9| 9| 9| 4| 1| 4| 0| 6| 6| 4| 5| 5| 5|            |
 __________________________________________|__________________________________________________________________________|      T (*) |
                                           | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|      O     |
   FISCHER 344 RATS FEMALE                 | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|      T     |
                               ANIMAL ID   | 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 4|      A     |
    90                                     | 7| 7| 7| 7| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 0|      L     |
    MG/KG/DY                               | 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0|            |
 _____________________________________________________________________________________________________________________|____________|
 HEMATOPOIETIC SYSTEM - cont               |                                                                          |            |
      Infiltration Cellular, Mixed Cell    |                                                                          |      1  4.0|
      Pigmentation                         |       2     3  3  3  2     3  3  2  2  2  2        2  4  2  3  4  3  2  2|     36  2.6|
      Lymphoid Follicle, Atrophy           |                2                                               3         |      4  2.8|
      Lymphoid Follicle, Hyperplasia       |                                                                          |      1  3.0|
                                           |__________________________________________________________________________|____________|
   Thymus                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
 _____________________________________________________________________________________________________________________|            |
 INTEGUMENTARY SYSTEM                      |                                                                          |            |
                                           |__________________________________________________________________________|____________|
   Mammary Gland                           | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Hyperplasia                          | 2  2  2  3  4     3  2        3  2     2  2  2  2  2  3     3     3  2  2|     40  2.5|
                                           |__________________________________________________________________________|____________|
   Skin                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Inflammation, Chronic                |                                                                          |      1  3.0|
      Subcutaneous Tissue, Edema           |                                                                          |      1  3.0|
 _____________________________________________________________________________________________________________________|            |
 MUSCULOSKELETAL SYSTEM                    |                                                                          |            |
                                           |__________________________________________________________________________|____________|
   Bone                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
 _____________________________________________________________________________________________________________________|            |
 NERVOUS SYSTEM                            |                                                                          |            |
                                           |__________________________________________________________________________|____________|
   Brain                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Compression                          |             3     2           4                       4     4            |      8  3.4|
      Hydrocephalus                        |                                                       3                  |      1  3.0|
 _____________________________________________________________________________________________________________________|            |
 RESPIRATORY SYSTEM                        |                                                                          |            |
                                           |__________________________________________________________________________|____________|
   Lung                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Congestion                           |                2  3        4                             4     3         |      7  3.0|
      Edema                                |                2                                         3  2  3         |      7  2.4|
      Hemorrhage                           |                            3                                         1   |      4  2.5|
      Infiltration Cellular, Histiocyte    |    1  1  1  2  2  1  1  1  2  1  1  1  1  1  1     1  1     2     1  1  1|     43  1.4|
      Alveolar Epithelium, Hyperplasia     |                                                                          |      5  2.2|
 _____________________________________________________________________________________________________________________|____________|
                                                                                                                                    
  * : Total animals with tissue examined microscopically; total animals with lesion and mean severity grade                         
  + : Tissue examined microscopically                M : Missing tissue                        1-4 : Lesion qualified as:           
  X : Lesion present but not qualified               A : Autolysis precludes examination               1) Minimal  3) Moderate      
  I : Insufficient tissue                        BLANK : Not examined                                  2) Mild     4) Marked        
                                                                                                                                    
                                                             Page  46                                                               
                                                                                                                                   
NTP Experiment-Test: 93023-06                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09  
Study Type: CHRONIC                                           2,4-HEXADIENAL                                      Date: 03/14/01    
Route: GAVAGE                                                                                                     Time: 15:02:06    
 __________________________________________________________________________________________________________________________________ 
                                           | 6| 7| 7| 7| 7| 3| 7| 7| 4| 6| 7| 7| 7| 7| 7| 7| 6| 7| 5| 3| 6| 3| 7| 7| 7|            |
                             DAY ON TEST   | 9| 3| 3| 3| 3| 6| 2| 3| 4| 6| 2| 2| 2| 2| 2| 3| 0| 3| 6| 4| 3| 6| 3| 3| 3|            |
                                           | 0| 4| 4| 4| 4| 4| 1| 3| 5| 6| 9| 9| 9| 9| 9| 4| 1| 4| 0| 6| 6| 4| 5| 5| 5|            |
 __________________________________________|__________________________________________________________________________|      T (*) |
                                           | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|      O     |
   FISCHER 344 RATS FEMALE                 | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|      T     |
                               ANIMAL ID   | 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 4|      A     |
    90                                     | 7| 7| 7| 7| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 0|      L     |
    MG/KG/DY                               | 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0|            |
 _____________________________________________________________________________________________________________________|____________|
 RESPIRATORY SYSTEM - cont                 |                                                                          |            |
                                           |__________________________________________________________________________|____________|
   Nose                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Foreign Body                         |                                                             X  X         |      2     |
      Inflammation, Chronic                |                                                                1         |      4  1.5|
                                           |__________________________________________________________________________|____________|
   Trachea                                 | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
 _____________________________________________________________________________________________________________________|            |
 SPECIAL SENSES SYSTEM                     |                                                                          |            |
                                           |__________________________________________________________________________|____________|
   Eye                                     |                                                                          |   1        |
      Cataract                             |                                                                          |      1  3.0|
      Retina, Degeneration                 |                                                                          |      1  4.0|
 _____________________________________________________________________________________________________________________|            |
 URINARY SYSTEM                            |                                                                          |            |
                                           |__________________________________________________________________________|____________|
   Kidney                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Cyst                                 |                   3                                                      |      1  3.0|
      Hydronephrosis                       |                                                    4                     |      2  3.0|
      Nephropathy                          | 1                 1           1                                          |      6  1.0|
      Renal Tubule, Cytoplasmic Alteration |             2                 2                                          |      4  2.0|
      Renal Tubule, Infarct                |                                                                          |      1  4.0|
      Renal Tubule, Necrosis               | 3                                                                        |      2  2.5|
      Renal Tubule, Pigmentation           | 2  2                    2                       2                        |      8  2.0|
      Transitional Epithelium, Hyperplasia |                                                                          |      1  2.0|
                                           |__________________________________________________________________________|____________|
   Urinary Bladder                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
 __________________________________________________________________________________________________________________________________ 
                                                                                                                                    
  * : Total animals with tissue examined microscopically; total animals with lesion and mean severity grade                         
  + : Tissue examined microscopically                M : Missing tissue                        1-4 : Lesion qualified as:           
  X : Lesion present but not qualified               A : Autolysis precludes examination               1) Minimal  3) Moderate      
  I : Insufficient tissue                        BLANK : Not examined                                  2) Mild     4) Marked        
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                             Page  47                                                               
                                                                                                                                   
NTP Experiment-Test: 93023-06                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09  
Study Type: CHRONIC                                           2,4-HEXADIENAL                                      Date: 03/14/01    
Route: GAVAGE                                                                                                     Time: 15:02:06    
 _____________________________________________________________________________________________________________________              
                                           | 7| 7| 6| 7| 7| 7| 7| 7| 7| 7| 7| 7| 7| 4| 6| 6| 7| 7| 7| 7| 7| 6| 7| 7| 7|             
                             DAY ON TEST   | 3| 3| 0| 3| 3| 3| 2| 2| 2| 3| 3| 3| 3| 7| 9| 9| 3| 3| 3| 3| 3| 2| 3| 3| 3|             
                                           | 1| 1| 9| 1| 1| 1| 9| 9| 9| 1| 1| 1| 0| 9| 9| 9| 0| 0| 1| 1| 1| 9| 1| 1| 0|             
 __________________________________________|__________________________________________________________________________|             
                                           | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|             
   FISCHER 344 RATS MALE                   | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|             
                               ANIMAL ID   | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|             
    0                                      | 0| 0| 0| 0| 0| 0| 0| 0| 0| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 2| 2| 2| 2| 2| 2|             
    MG/KG/DY                               | 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5|             
 __________________________________________|__________________________________________________________________________|             
 ALIMENTARY SYSTEM                         |                                                                          |             
                                           |__________________________________________________________________________|             
   Esophagus                               | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Perforation                          |                                                                          |             
                                           |__________________________________________________________________________|             
   Intestine Large, Colon                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                           |__________________________________________________________________________|             
   Intestine Large, Rectum                 | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                           |__________________________________________________________________________|             
   Intestine Large, Cecum                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                           |__________________________________________________________________________|             
   Intestine Small, Duodenum               | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                           |__________________________________________________________________________|             
   Intestine Small, Jejunum                | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                           |__________________________________________________________________________|             
   Intestine Small, Ileum                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                           |__________________________________________________________________________|             
   Liver                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Basophilic Focus                     | X  X  X  X  X  X  X     X  X  X  X  X        X     X  X  X  X     X     X|             
      Clear Cell Focus                     |          X                 X        X                                    |             
      Degeneration, Cystic                 |                                           2                              |             
      Eosinophilic Focus                   |                      X                       X                           |             
      Hemorrhage                           |                                                             2            |             
      Hepatodiaphragmatic Nodule           |             X                                                            |             
      Infiltration Cellular, Mixed Cell    |                1                                                         |             
      Mixed Cell Focus                     |                      X                    X                 X        X  X|             
      Bile Duct, Hyperplasia               |    1     1     1  1        1        1     3     1     1  1        1  1   |             
      Centrilobular, Necrosis              |                                        3                                 |             
      Hepatocyte, Vacuolization Cytoplasmic|                         2                                                |             
                                           |__________________________________________________________________________|             
   Mesentery                               |    +        +              +  +     +                             +  +   |             
      Accessory Spleen                     |             X              X                                             |             
      Hemorrhage                           |                                                                          |             
      Fat, Necrosis                        |    3                          3     2                             3  4   |             
                                           |__________________________________________________________________________|             
   Oral Mucosa                             |                                                                          |             
                                           |__________________________________________________________________________|             
   Pancreas                                | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Atrophy                              |             4        1        2           2  2     1  2           3     3|             
 __________________________________________|__________________________________________________________________________|             
                                                                                                                                    
                                                                                                                                    
                                                             Page  48                                                               
                                                                                                                                   
NTP Experiment-Test: 93023-06                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09  
Study Type: CHRONIC                                           2,4-HEXADIENAL                                      Date: 03/14/01    
Route: GAVAGE                                                                                                     Time: 15:02:06    
 _____________________________________________________________________________________________________________________              
                                           | 7| 7| 6| 7| 7| 7| 7| 7| 7| 7| 7| 7| 7| 4| 6| 6| 7| 7| 7| 7| 7| 6| 7| 7| 7|             
                             DAY ON TEST   | 3| 3| 0| 3| 3| 3| 2| 2| 2| 3| 3| 3| 3| 7| 9| 9| 3| 3| 3| 3| 3| 2| 3| 3| 3|             
                                           | 1| 1| 9| 1| 1| 1| 9| 9| 9| 1| 1| 1| 0| 9| 9| 9| 0| 0| 1| 1| 1| 9| 1| 1| 0|             
 __________________________________________|__________________________________________________________________________|             
                                           | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|             
   FISCHER 344 RATS MALE                   | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|             
                               ANIMAL ID   | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|             
    0                                      | 0| 0| 0| 0| 0| 0| 0| 0| 0| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 2| 2| 2| 2| 2| 2|             
    MG/KG/DY                               | 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5|             
 __________________________________________|__________________________________________________________________________|             
 ALIMENTARY SYSTEM - cont                  |                                                                          |             
      Cyst                                 |                                                       3                  |             
      Acinus, Cytoplasmic Alteration       |                                              3                           |             
      Acinus, Hyperplasia, Focal           |                2     2     3                    2  2  2  3  3     3      |             
                                           |__________________________________________________________________________|             
   Salivary Glands                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Atrophy                              |                            1                                             |             
                                           |__________________________________________________________________________|             
   Stomach, Forestomach                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Ulcer                                |                                              1                           |             
      Epithelium, Hyperplasia              |                   1     1                                                |             
                                           |__________________________________________________________________________|             
   Stomach, Glandular                      | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Erosion                              |                                              1                           |             
      Ulcer                                |                                                                          |             
                                           |__________________________________________________________________________|             
   Tongue                                  |                   +                                                     +|             
      Epithelium, Hyperplasia              |                   4                                                     4|             
 _____________________________________________________________________________________________________________________|             
 CARDIOVASCULAR SYSTEM                     |                                                                          |             
                                           |__________________________________________________________________________|             
   Heart                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Cardiomyopathy                       | 1  1  3  1     2  3     2  2  3  3  3  3     1  1  3  1  1  3  2  3      |             
      Thrombosis                           |                                                                          |             
 _____________________________________________________________________________________________________________________|             
 ENDOCRINE SYSTEM                          |                                                                          |             
                                           |__________________________________________________________________________|             
   Adrenal Cortex                          | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Accessory Adrenal Cortical Nodule    |                      3  3              3           3  3  3        3  3  3|             
      Degeneration, Fatty                  |       1           1           3           2  2  2        3     2         |             
      Hyperplasia, Diffuse                 |                                                                          |             
      Hyperplasia, Focal                   |                      1                                                   |             
      Hypertrophy, Focal                   |                            1  3                                1         |             
                                           |__________________________________________________________________________|             
   Adrenal Medulla                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Hyperplasia                          |                                     1                                3   |             
                                           |__________________________________________________________________________|             
   Islets, Pancreatic                      | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Hyperplasia                          |                                                                          |             
 __________________________________________|__________________________________________________________________________|             
                                                                                                                                    
                                                                                                                                    
                                                             Page  49                                                               
                                                                                                                                   
NTP Experiment-Test: 93023-06                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09  
Study Type: CHRONIC                                           2,4-HEXADIENAL                                      Date: 03/14/01    
Route: GAVAGE                                                                                                     Time: 15:02:06    
 _____________________________________________________________________________________________________________________              
                                           | 7| 7| 6| 7| 7| 7| 7| 7| 7| 7| 7| 7| 7| 4| 6| 6| 7| 7| 7| 7| 7| 6| 7| 7| 7|             
                             DAY ON TEST   | 3| 3| 0| 3| 3| 3| 2| 2| 2| 3| 3| 3| 3| 7| 9| 9| 3| 3| 3| 3| 3| 2| 3| 3| 3|             
                                           | 1| 1| 9| 1| 1| 1| 9| 9| 9| 1| 1| 1| 0| 9| 9| 9| 0| 0| 1| 1| 1| 9| 1| 1| 0|             
 __________________________________________|__________________________________________________________________________|             
                                           | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|             
   FISCHER 344 RATS MALE                   | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|             
                               ANIMAL ID   | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|             
    0                                      | 0| 0| 0| 0| 0| 0| 0| 0| 0| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 2| 2| 2| 2| 2| 2|             
    MG/KG/DY                               | 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5|             
 __________________________________________|__________________________________________________________________________|             
 ENDOCRINE SYSTEM - cont                   |                                                                          |             
                                           |__________________________________________________________________________|             
   Parathyroid Gland                       | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                           |__________________________________________________________________________|             
   Pituitary Gland                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Pars Distalis, Angiectasis           |                                     2                                    |             
      Pars Distalis, Cyst                  |                                     3                                   3|             
      Pars Distalis, Hyperplasia, Focal    |                      2              2     2                              |             
                                           |__________________________________________________________________________|             
   Thyroid Gland                           | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      C-Cell, Hyperplasia                  | 2  1  1  1     1     1        1  1  1        2              3           1|             
      Follicle, Cyst                       |                                              3                           |             
 _____________________________________________________________________________________________________________________|             
 GENERAL BODY SYSTEM                       |                                                                          |             
                                           |__________________________________________________________________________|             
   Peritoneum                              |                         +                    +        +     +            |             
 _____________________________________________________________________________________________________________________|             
 GENITAL SYSTEM                            |                                                                          |             
                                           |__________________________________________________________________________|             
   Epididymis                              | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Atypia Cellular                      |       3  3  3  3  3  3  3     3     3  3  4     3  3  4  3  2     3  2  3|             
                                           |__________________________________________________________________________|             
   Preputial Gland                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  M  +  +  +  +  +  +  +  +  +  +|             
      Cyst                                 |                         3                                                |             
      Inflammation, Chronic                |             2  2  2     2     2              2  2  2     3  2        2   |             
                                           |__________________________________________________________________________|             
   Prostate                                | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Inflammation, Chronic                |    2  2     2     3        3                    2  2        2            |             
      Epithelium, Ventral, Degeneration    |                                                                      2   |             
      Epithelium, Ventral, Hyperplasia     | 1              1  2                 2                          1  1  1   |             
      Ventral, Inflammation                |                                                                      1   |             
                                           |__________________________________________________________________________|             
   Seminal Vesicle                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                           |__________________________________________________________________________|             
   Testes                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Germinal Epithelium, Atrophy         |                   4        1                    4        4               |             
      Interstitial Cell, Hyperplasia       |                   2                    2        1        2               |             
 _____________________________________________________________________________________________________________________|             
 HEMATOPOIETIC SYSTEM                      |                                                                          |             
 __________________________________________|__________________________________________________________________________|             
                                                                                                                                    
                                                                                                                                    
                                                             Page  50                                                               
                                                                                                                                   
NTP Experiment-Test: 93023-06                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09  
Study Type: CHRONIC                                           2,4-HEXADIENAL                                      Date: 03/14/01    
Route: GAVAGE                                                                                                     Time: 15:02:06    
 _____________________________________________________________________________________________________________________              
                                           | 7| 7| 6| 7| 7| 7| 7| 7| 7| 7| 7| 7| 7| 4| 6| 6| 7| 7| 7| 7| 7| 6| 7| 7| 7|             
                             DAY ON TEST   | 3| 3| 0| 3| 3| 3| 2| 2| 2| 3| 3| 3| 3| 7| 9| 9| 3| 3| 3| 3| 3| 2| 3| 3| 3|             
                                           | 1| 1| 9| 1| 1| 1| 9| 9| 9| 1| 1| 1| 0| 9| 9| 9| 0| 0| 1| 1| 1| 9| 1| 1| 0|             
 __________________________________________|__________________________________________________________________________|             
                                           | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|             
   FISCHER 344 RATS MALE                   | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|             
                               ANIMAL ID   | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|             
    0                                      | 0| 0| 0| 0| 0| 0| 0| 0| 0| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 2| 2| 2| 2| 2| 2|             
    MG/KG/DY                               | 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5|             
 __________________________________________|__________________________________________________________________________|             
 HEMATOPOIETIC SYSTEM - cont               |                                                                          |             
                                           |__________________________________________________________________________|             
   Bone Marrow                             | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Hyperplasia                          |                                     2  3                       3         |             
                                           |__________________________________________________________________________|             
   Lymph Node                              |          +  +     +  +     +              +        +  +  +     +     +  +|             
      Mediastinal, Ectasia                 |                                                                          |             
      Mediastinal, Hemorrhage              |                   4                                            2         |             
      Mediastinal, Hyperplasia, Lymphoid   |                            2                                   2        3|             
      Mediastinal, Pigmentation            |                   3  2                                         2         |             
      Pancreatic, Hemorrhage               |          1  1                                      1     1              1|             
      Pancreatic, Hyperplasia, Lymphoid    |          3  3              2                             3     1        1|             
      Pancreatic, Pigmentation             |          1  1              1              1        1     2              3|             
                                           |__________________________________________________________________________|             
   Lymph Node, Mandibular                  | M  M  M  M  M  M  M  M  M  +  M  M  M  M  M  M  +  M  M  M  +  +  M  M  M|             
      Ectasia                              |                            2                                             |             
      Hyperplasia, Lymphoid                |                                                 2                        |             
                                           |__________________________________________________________________________|             
   Lymph Node, Mesenteric                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Hemorrhage                           |    1                 1     2  1                    2                     |             
      Hyperplasia, Lymphoid                |                               2              2           2        3     3|             
      Pigmentation                         | 2  3  2  3  3  2  3  2  3  3  2  3        3  2  2  2  1  2  3  1  1  2  1|             
                                           |__________________________________________________________________________|             
   Spleen                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Fibrosis                             |                                           3                          2   |             
      Hematopoietic Cell Proliferation     |       3     1  1  2  1                 4     2     1        1  4        1|             
      Pigmentation                         |             2     2                       2              1               |             
                                           |__________________________________________________________________________|             
   Thymus                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Hemorrhage                           |                                                                          |             
 _____________________________________________________________________________________________________________________|             
 INTEGUMENTARY SYSTEM                      |                                                                          |             
                                           |__________________________________________________________________________|             
   Mammary Gland                           | +  +  M  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Hyperplasia                          |    3        4     4        2        2  2        1              3         |             
                                           |__________________________________________________________________________|             
   Skin                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Foreign Body                         |                                                                          |             
      Inflammation, Chronic                |                                                 3                        |             
 __________________________________________|__________________________________________________________________________|             
                                                                                                                                    
                                                                                                                                    
                                                             Page  51                                                               
                                                                                                                                   
NTP Experiment-Test: 93023-06                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09  
Study Type: CHRONIC                                           2,4-HEXADIENAL                                      Date: 03/14/01    
Route: GAVAGE                                                                                                     Time: 15:02:06    
 _____________________________________________________________________________________________________________________              
                                           | 7| 7| 6| 7| 7| 7| 7| 7| 7| 7| 7| 7| 7| 4| 6| 6| 7| 7| 7| 7| 7| 6| 7| 7| 7|             
                             DAY ON TEST   | 3| 3| 0| 3| 3| 3| 2| 2| 2| 3| 3| 3| 3| 7| 9| 9| 3| 3| 3| 3| 3| 2| 3| 3| 3|             
                                           | 1| 1| 9| 1| 1| 1| 9| 9| 9| 1| 1| 1| 0| 9| 9| 9| 0| 0| 1| 1| 1| 9| 1| 1| 0|             
 __________________________________________|__________________________________________________________________________|             
                                           | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|             
   FISCHER 344 RATS MALE                   | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|             
                               ANIMAL ID   | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|             
    0                                      | 0| 0| 0| 0| 0| 0| 0| 0| 0| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 2| 2| 2| 2| 2| 2|             
    MG/KG/DY                               | 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5|             
 __________________________________________|__________________________________________________________________________|             
 INTEGUMENTARY SYSTEM - cont               |                                                                          |             
      Necrosis                             |                                                                          |             
      Epidermis, Hyperplasia               |                                                 3                        |             
 _____________________________________________________________________________________________________________________|             
 MUSCULOSKELETAL SYSTEM                    |                                                                          |             
                                           |__________________________________________________________________________|             
   Bone                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Cranium, Osteopetrosis               |                                           3                              |             
                                           |__________________________________________________________________________|             
   Skeletal Muscle                         |                                                                          |             
 _____________________________________________________________________________________________________________________|             
 NERVOUS SYSTEM                            |                                                                          |             
                                           |__________________________________________________________________________|             
   Brain                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Compression                          |             4     4                                            2         |             
      Hemorrhage                           |                                        3                                 |             
      Hydrocephalus                        |                                                                          |             
      Necrosis                             |                                        2                                 |             
                                           |__________________________________________________________________________|             
   Peripheral Nerve                        |                                        +                                 |             
                                           |__________________________________________________________________________|             
   Spinal Cord                             |                                        +                                 |             
 _____________________________________________________________________________________________________________________|             
 RESPIRATORY SYSTEM                        |                                                                          |             
                                           |__________________________________________________________________________|             
   Lung                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Congestion                           |                                                                          |             
      Edema                                |                                                                      3   |             
      Foreign Body                         |                                                                          |             
      Hemorrhage                           |                            2                                             |             
      Infiltration Cellular, Histiocyte    |       1  1  1  1  2  1  2  1        1     1     1     1  1  1  1  1  3  1|             
      Metaplasia, Osseous                  |                                           1                              |             
      Alveolar Epithelium, Hyperplasia     |                            3                 2                           |             
                                           |__________________________________________________________________________|             
   Nose                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Foreign Body                         |                                                                          |             
      Inflammation, Chronic                |                         2  2                                         1   |             
      Respiratory Epithelium, Hyperplasia  |                                                                          |             
                                           |__________________________________________________________________________|             
 __________________________________________|__________________________________________________________________________|             
                                                                                                                                    
                                                                                                                                    
                                                             Page  52                                                               
                                                                                                                                   
NTP Experiment-Test: 93023-06                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09  
Study Type: CHRONIC                                           2,4-HEXADIENAL                                      Date: 03/14/01    
Route: GAVAGE                                                                                                     Time: 15:02:06    
 _____________________________________________________________________________________________________________________              
                                           | 7| 7| 6| 7| 7| 7| 7| 7| 7| 7| 7| 7| 7| 4| 6| 6| 7| 7| 7| 7| 7| 6| 7| 7| 7|             
                             DAY ON TEST   | 3| 3| 0| 3| 3| 3| 2| 2| 2| 3| 3| 3| 3| 7| 9| 9| 3| 3| 3| 3| 3| 2| 3| 3| 3|             
                                           | 1| 1| 9| 1| 1| 1| 9| 9| 9| 1| 1| 1| 0| 9| 9| 9| 0| 0| 1| 1| 1| 9| 1| 1| 0|             
 __________________________________________|__________________________________________________________________________|             
                                           | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|             
   FISCHER 344 RATS MALE                   | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|             
                               ANIMAL ID   | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|             
    0                                      | 0| 0| 0| 0| 0| 0| 0| 0| 0| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 2| 2| 2| 2| 2| 2|             
    MG/KG/DY                               | 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5|             
 __________________________________________|__________________________________________________________________________|             
 RESPIRATORY SYSTEM - cont                 |                                                                          |             
   Trachea                                 | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
 _____________________________________________________________________________________________________________________|             
 SPECIAL SENSES SYSTEM                     |                                                                          |             
                                           |__________________________________________________________________________|             
   Eye                                     |                                        +                                 |             
      Cataract                             |                                        3                                 |             
      Retina, Degeneration                 |                                        3                                 |             
                                           |__________________________________________________________________________|             
   Zymbal's Gland                          |       +                                                                  |             
 _____________________________________________________________________________________________________________________|             
 URINARY SYSTEM                            |                                                                          |             
                                           |__________________________________________________________________________|             
   Kidney                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Hydronephrosis                       |                                                                          |             
      Inflammation, Chronic                |                   2                                   3                  |             
      Nephropathy                          |             1  1  3        1        1  3  1  3  1     3           1  1  2|             
      Renal Tubule, Dilatation             |                                                                          |             
      Renal Tubule, Necrosis               |                                        3                                 |             
                                           |__________________________________________________________________________|             
   Urinary Bladder                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Hemorrhage                           |                                                                          |             
      Inflammation, Suppurative            |                                                                          |             
 __________________________________________|__________________________________________________________________________              
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                             Page  53                                                               
                                                                                                                                   
NTP Experiment-Test: 93023-06                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09  
Study Type: CHRONIC                                           2,4-HEXADIENAL                                      Date: 03/14/01    
Route: GAVAGE                                                                                                     Time: 15:02:06    
 __________________________________________________________________________________________________________________________________ 
                                           | 7| 7| 7| 7| 7| 6| 2| 7| 7| 7| 5| 7| 7| 5| 7| 7| 7| 7| 7| 5| 7| 6| 7| 6| 7|            |
                             DAY ON TEST   | 3| 3| 2| 2| 2| 5| 5| 3| 3| 3| 5| 3| 3| 8| 3| 3| 3| 3| 0| 4| 3| 3| 3| 3| 3|            |
                                           | 0| 0| 9| 9| 9| 5| 9| 0| 0| 0| 4| 2| 2| 7| 0| 0| 0| 1| 4| 2| 1| 4| 1| 4| 2|            |
 __________________________________________|__________________________________________________________________________|      T (*) |
                                           | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|      O     |
   FISCHER 344 RATS MALE                   | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|      T     |
                               ANIMAL ID   | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|      A     |
    0                                      | 2| 2| 2| 2| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 5|      L     |
    MG/KG/DY                               | 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0|            |
 _____________________________________________________________________________________________________________________|____________|
 ALIMENTARY SYSTEM                         |                                                                          |            |
                                           |__________________________________________________________________________|____________|
   Esophagus                               | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Perforation                          |                   X                                                      |      1     |
                                           |__________________________________________________________________________|____________|
   Intestine Large, Colon                  | +  +  +  +  +  +  +  +  +  +  M  +  +  +  +  +  +  M  +  +  +  +  +  +  +|  48        |
                                           |__________________________________________________________________________|____________|
   Intestine Large, Rectum                 | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  I  +  +  +|  49        |
                                           |__________________________________________________________________________|____________|
   Intestine Large, Cecum                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
                                           |__________________________________________________________________________|____________|
   Intestine Small, Duodenum               | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
                                           |__________________________________________________________________________|____________|
   Intestine Small, Jejunum                | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  A  +  +  +|  49        |
                                           |__________________________________________________________________________|____________|
   Intestine Small, Ileum                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  A  +  +  +|  49        |
                                           |__________________________________________________________________________|____________|
   Liver                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Basophilic Focus                     | X  X           X     X  X  X     X  X     X  X     X        X     X     X|     33     |
      Clear Cell Focus                     |       X     X                             X              X               |      7     |
      Degeneration, Cystic                 |                                                                          |      1  2.0|
      Eosinophilic Focus                   |                                              X              X            |      4     |
      Hemorrhage                           |                                                                          |      1  2.0|
      Hepatodiaphragmatic Nodule           | X                                                                        |      2     |
      Infiltration Cellular, Mixed Cell    | 1                       1        1                          1            |      5  1.0|
      Mixed Cell Focus                     | X                       X                                                |      7     |
      Bile Duct, Hyperplasia               | 1  1  1        1     1     1  1  1     1  1  1                       3  1|     25  1.2|
      Centrilobular, Necrosis              |                                                                          |      1  3.0|
      Hepatocyte, Vacuolization Cytoplasmic|                                                                          |      1  2.0|
                                           |__________________________________________________________________________|____________|
   Mesentery                               |          +  +                 +     +              +  +                  |  13        |
      Accessory Spleen                     |                                                                          |      2     |
      Hemorrhage                           |                               3                                          |      1  3.0|
      Fat, Necrosis                        |          2  3                 2     4              3  2                  |     11  2.8|
                                           |__________________________________________________________________________|____________|
 _____________________________________________________________________________________________________________________|____________|
                                                                                                                                    
  * : Total animals with tissue examined microscopically; total animals with lesion and mean severity grade                         
  + : Tissue examined microscopically                M : Missing tissue                        1-4 : Lesion qualified as:           
  X : Lesion present but not qualified               A : Autolysis precludes examination               1) Minimal  3) Moderate      
  I : Insufficient tissue                        BLANK : Not examined                                  2) Mild     4) Marked        
                                                                                                                                    
                                                             Page  54                                                               
                                                                                                                                   
NTP Experiment-Test: 93023-06                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09  
Study Type: CHRONIC                                           2,4-HEXADIENAL                                      Date: 03/14/01    
Route: GAVAGE                                                                                                     Time: 15:02:06    
 __________________________________________________________________________________________________________________________________ 
                                           | 7| 7| 7| 7| 7| 6| 2| 7| 7| 7| 5| 7| 7| 5| 7| 7| 7| 7| 7| 5| 7| 6| 7| 6| 7|            |
                             DAY ON TEST   | 3| 3| 2| 2| 2| 5| 5| 3| 3| 3| 5| 3| 3| 8| 3| 3| 3| 3| 0| 4| 3| 3| 3| 3| 3|            |
                                           | 0| 0| 9| 9| 9| 5| 9| 0| 0| 0| 4| 2| 2| 7| 0| 0| 0| 1| 4| 2| 1| 4| 1| 4| 2|            |
 __________________________________________|__________________________________________________________________________|      T (*) |
                                           | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|      O     |
   FISCHER 344 RATS MALE                   | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|      T     |
                               ANIMAL ID   | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|      A     |
    0                                      | 2| 2| 2| 2| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 5|      L     |
    MG/KG/DY                               | 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0|            |
 _____________________________________________________________________________________________________________________|____________|
 ALIMENTARY SYSTEM - cont                  |                                                                          |            |
   Oral Mucosa                             |                                                                      +   |   1        |
                                           |__________________________________________________________________________|____________|
   Pancreas                                | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Atrophy                              |             3                                   2     2     2     1  1  1|     16  2.0|
      Cyst                                 |                            3                                             |      2  3.0|
      Acinus, Cytoplasmic Alteration       |                                                          3  2            |      3  2.7|
      Acinus, Hyperplasia, Focal           |    3                    2     3     2     3        3  2           3      |     17  2.5|
                                           |__________________________________________________________________________|____________|
   Salivary Glands                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Atrophy                              |                      2                                                  3|      3  2.0|
                                           |__________________________________________________________________________|____________|
   Stomach, Forestomach                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Ulcer                                |                                                                          |      1  1.0|
      Epithelium, Hyperplasia              |                                                          1               |      3  1.0|
                                           |__________________________________________________________________________|____________|
   Stomach, Glandular                      | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Erosion                              |                                                                          |      1  1.0|
      Ulcer                                |                                                          2               |      1  2.0|
                                           |__________________________________________________________________________|____________|
   Tongue                                  |                                                                          |   2        |
      Epithelium, Hyperplasia              |                                                                          |      2  4.0|
 _____________________________________________________________________________________________________________________|            |
 CARDIOVASCULAR SYSTEM                     |                                                                          |            |
                                           |__________________________________________________________________________|____________|
   Heart                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Cardiomyopathy                       |       2  3  1  1     2     1     1  2     1     3  2  2     2  3  3     1|     36  2.0|
      Thrombosis                           |                                                                4         |      1  4.0|
 _____________________________________________________________________________________________________________________|            |
 ENDOCRINE SYSTEM                          |                                                                          |            |
                                           |__________________________________________________________________________|____________|
   Adrenal Cortex                          | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Accessory Adrenal Cortical Nodule    |    3  3  3           3  3  3                 3                    3     3|     18  3.0|
      Degeneration, Fatty                  |                                           4     3     1           2      |     12  2.2|
      Hyperplasia, Diffuse                 |                                                       3                  |      1  3.0|
 _____________________________________________________________________________________________________________________|____________|
                                                                                                                                    
  * : Total animals with tissue examined microscopically; total animals with lesion and mean severity grade                         
  + : Tissue examined microscopically                M : Missing tissue                        1-4 : Lesion qualified as:           
  X : Lesion present but not qualified               A : Autolysis precludes examination               1) Minimal  3) Moderate      
  I : Insufficient tissue                        BLANK : Not examined                                  2) Mild     4) Marked        
                                                                                                                                    
                                                             Page  55                                                               
                                                                                                                                   
NTP Experiment-Test: 93023-06                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09  
Study Type: CHRONIC                                           2,4-HEXADIENAL                                      Date: 03/14/01    
Route: GAVAGE                                                                                                     Time: 15:02:06    
 __________________________________________________________________________________________________________________________________ 
                                           | 7| 7| 7| 7| 7| 6| 2| 7| 7| 7| 5| 7| 7| 5| 7| 7| 7| 7| 7| 5| 7| 6| 7| 6| 7|            |
                             DAY ON TEST   | 3| 3| 2| 2| 2| 5| 5| 3| 3| 3| 5| 3| 3| 8| 3| 3| 3| 3| 0| 4| 3| 3| 3| 3| 3|            |
                                           | 0| 0| 9| 9| 9| 5| 9| 0| 0| 0| 4| 2| 2| 7| 0| 0| 0| 1| 4| 2| 1| 4| 1| 4| 2|            |
 __________________________________________|__________________________________________________________________________|      T (*) |
                                           | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|      O     |
   FISCHER 344 RATS MALE                   | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|      T     |
                               ANIMAL ID   | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|      A     |
    0                                      | 2| 2| 2| 2| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 5|      L     |
    MG/KG/DY                               | 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0|            |
 _____________________________________________________________________________________________________________________|____________|
 ENDOCRINE SYSTEM - cont                   |                                                                          |            |
      Hyperplasia, Focal                   |                                                                          |      1  1.0|
      Hypertrophy, Focal                   |                                           3                          1   |      5  1.8|
                                           |__________________________________________________________________________|____________|
   Adrenal Medulla                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Hyperplasia                          |    1  2        3                 1                                   3   |      7  2.0|
                                           |__________________________________________________________________________|____________|
   Islets, Pancreatic                      | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Hyperplasia                          |                                                                   3  2   |      2  2.5|
                                           |__________________________________________________________________________|____________|
   Parathyroid Gland                       | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
                                           |__________________________________________________________________________|____________|
   Pituitary Gland                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Pars Distalis, Angiectasis           |                                  2     3                                 |      3  2.3|
      Pars Distalis, Cyst                  |                                     3                                   3|      4  3.0|
      Pars Distalis, Hyperplasia, Focal    |       2                 3           3  3        2                        |      8  2.4|
                                           |__________________________________________________________________________|____________|
   Thyroid Gland                           | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      C-Cell, Hyperplasia                  |    2  3        2     2  1  3        2  1     2  1  2  1  3           1   |     26  1.6|
      Follicle, Cyst                       |                                                                          |      1  3.0|
 _____________________________________________________________________________________________________________________|            |
 GENERAL BODY SYSTEM                       |                                                                          |            |
                                           |__________________________________________________________________________|____________|
   Peritoneum                              |                                                                          |   4        |
 _____________________________________________________________________________________________________________________|            |
 GENITAL SYSTEM                            |                                                                          |            |
                                           |__________________________________________________________________________|____________|
   Epididymis                              | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Atypia Cellular                      | 2  3  2  3  2  2        4  3        3     2  3  3  3  2        2        2|     35  2.8|
                                           |__________________________________________________________________________|____________|
   Preputial Gland                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  49        |
      Cyst                                 |                                                                          |      1  3.0|
      Inflammation, Chronic                | 2           3  2     2     3  2              2  3  2                    2|     21  2.2|
                                           |__________________________________________________________________________|____________|
   Prostate                                | +  +  +  I  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  49        |
 _____________________________________________________________________________________________________________________|____________|
                                                                                                                                    
  * : Total animals with tissue examined microscopically; total animals with lesion and mean severity grade                         
  + : Tissue examined microscopically                M : Missing tissue                        1-4 : Lesion qualified as:           
  X : Lesion present but not qualified               A : Autolysis precludes examination               1) Minimal  3) Moderate      
  I : Insufficient tissue                        BLANK : Not examined                                  2) Mild     4) Marked        
                                                                                                                                    
                                                             Page  56                                                               
                                                                                                                                   
NTP Experiment-Test: 93023-06                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09  
Study Type: CHRONIC                                           2,4-HEXADIENAL                                      Date: 03/14/01    
Route: GAVAGE                                                                                                     Time: 15:02:06    
 __________________________________________________________________________________________________________________________________ 
                                           | 7| 7| 7| 7| 7| 6| 2| 7| 7| 7| 5| 7| 7| 5| 7| 7| 7| 7| 7| 5| 7| 6| 7| 6| 7|            |
                             DAY ON TEST   | 3| 3| 2| 2| 2| 5| 5| 3| 3| 3| 5| 3| 3| 8| 3| 3| 3| 3| 0| 4| 3| 3| 3| 3| 3|            |
                                           | 0| 0| 9| 9| 9| 5| 9| 0| 0| 0| 4| 2| 2| 7| 0| 0| 0| 1| 4| 2| 1| 4| 1| 4| 2|            |
 __________________________________________|__________________________________________________________________________|      T (*) |
                                           | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|      O     |
   FISCHER 344 RATS MALE                   | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|      T     |
                               ANIMAL ID   | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|      A     |
    0                                      | 2| 2| 2| 2| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 5|      L     |
    MG/KG/DY                               | 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0|            |
 _____________________________________________________________________________________________________________________|____________|
 GENITAL SYSTEM - cont                     |                                                                          |            |
      Inflammation, Chronic                |       2                             2                 4  3  2  2  2      |     15  2.3|
      Epithelium, Ventral, Degeneration    |                                        2                                1|      3  1.7|
      Epithelium, Ventral, Hyperplasia     |       1                                1  1              1        1      |     12  1.2|
      Ventral, Inflammation                |                                        2                                1|      3  1.3|
                                           |__________________________________________________________________________|____________|
   Seminal Vesicle                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
                                           |__________________________________________________________________________|____________|
   Testes                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Germinal Epithelium, Atrophy         | 2           4                    1                                2      |      8  2.8|
      Interstitial Cell, Hyperplasia       |                               2  1     2                             2   |      8  1.8|
 _____________________________________________________________________________________________________________________|            |
 HEMATOPOIETIC SYSTEM                      |                                                                          |            |
                                           |__________________________________________________________________________|____________|
   Bone Marrow                             | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Hyperplasia                          |                                     3                                    |      4  2.8|
                                           |__________________________________________________________________________|____________|
   Lymph Node                              | +           +  +  +        +  +                       +     +        +   |  21        |
      Mediastinal, Ectasia                 |                               3                                          |      1  3.0|
      Mediastinal, Hemorrhage              |                   3                                                      |      3  3.0|
      Mediastinal, Hyperplasia, Lymphoid   |                            2  3                                          |      5  2.4|
      Mediastinal, Pigmentation            |                                                                          |      3  2.3|
      Pancreatic, Hemorrhage               | 3                                                     2     1            |      8  1.4|
      Pancreatic, Hyperplasia, Lymphoid    | 2           3                                                            |      8  2.3|
      Pancreatic, Pigmentation             | 3           1                                         2     2        1   |     12  1.6|
                                           |__________________________________________________________________________|____________|
   Lymph Node, Mandibular                  | M  M  +  M  M  M  M  M  M  M  M  M  M  M  M  M  M  M  M  +  +  M  M  M  +|   8        |
      Ectasia                              |                                                                          |      1  2.0|
      Hyperplasia, Lymphoid                |                                                                          |      1  2.0|
                                           |__________________________________________________________________________|____________|
   Lymph Node, Mesenteric                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Hemorrhage                           | 1  3  1                 1                 1  1        3     3     1      |     14  1.6|
      Hyperplasia, Lymphoid                | 2  2                          2  2  2  2     2        2  3     3  2      |     16  2.3|
      Pigmentation                         | 2  3  2  2  2  2     2  2        3     2  2  2     2  3  2  2  2  2  2  2|     43  2.2|
                                           |__________________________________________________________________________|____________|
 _____________________________________________________________________________________________________________________|____________|
                                                                                                                                    
  * : Total animals with tissue examined microscopically; total animals with lesion and mean severity grade                         
  + : Tissue examined microscopically                M : Missing tissue                        1-4 : Lesion qualified as:           
  X : Lesion present but not qualified               A : Autolysis precludes examination               1) Minimal  3) Moderate      
  I : Insufficient tissue                        BLANK : Not examined                                  2) Mild     4) Marked        
                                                                                                                                    
                                                             Page  57                                                               
                                                                                                                                   
NTP Experiment-Test: 93023-06                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09  
Study Type: CHRONIC                                           2,4-HEXADIENAL                                      Date: 03/14/01    
Route: GAVAGE                                                                                                     Time: 15:02:06    
 __________________________________________________________________________________________________________________________________ 
                                           | 7| 7| 7| 7| 7| 6| 2| 7| 7| 7| 5| 7| 7| 5| 7| 7| 7| 7| 7| 5| 7| 6| 7| 6| 7|            |
                             DAY ON TEST   | 3| 3| 2| 2| 2| 5| 5| 3| 3| 3| 5| 3| 3| 8| 3| 3| 3| 3| 0| 4| 3| 3| 3| 3| 3|            |
                                           | 0| 0| 9| 9| 9| 5| 9| 0| 0| 0| 4| 2| 2| 7| 0| 0| 0| 1| 4| 2| 1| 4| 1| 4| 2|            |
 __________________________________________|__________________________________________________________________________|      T (*) |
                                           | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|      O     |
   FISCHER 344 RATS MALE                   | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|      T     |
                               ANIMAL ID   | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|      A     |
    0                                      | 2| 2| 2| 2| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 5|      L     |
    MG/KG/DY                               | 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0|            |
 _____________________________________________________________________________________________________________________|____________|
 HEMATOPOIETIC SYSTEM - cont               |                                                                          |            |
   Spleen                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Fibrosis                             |                                                                          |      2  2.5|
      Hematopoietic Cell Proliferation     |    1  1  1           2  1     1  1  1  2                                 |     20  1.6|
      Pigmentation                         |                                                       3  4        3      |      7  2.4|
                                           |__________________________________________________________________________|____________|
   Thymus                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Hemorrhage                           |                   3                                                      |      1  3.0|
 _____________________________________________________________________________________________________________________|            |
 INTEGUMENTARY SYSTEM                      |                                                                          |            |
                                           |__________________________________________________________________________|____________|
   Mammary Gland                           | +  +  +  +  +  +  M  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  48        |
      Hyperplasia                          | 3                                         3           3  3        3      |     13  2.8|
                                           |__________________________________________________________________________|____________|
   Skin                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Foreign Body                         |                   X                                                      |      1     |
      Inflammation, Chronic                |                                                                          |      1  3.0|
      Necrosis                             |                   4                                                      |      1  4.0|
      Epidermis, Hyperplasia               |                                                                          |      1  3.0|
 _____________________________________________________________________________________________________________________|            |
 MUSCULOSKELETAL SYSTEM                    |                                                                          |            |
                                           |__________________________________________________________________________|____________|
   Bone                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Cranium, Osteopetrosis               |                                                                          |      1  3.0|
                                           |__________________________________________________________________________|____________|
   Skeletal Muscle                         |                                                       +                  |   1        |
 _____________________________________________________________________________________________________________________|            |
 NERVOUS SYSTEM                            |                                                                          |            |
                                           |__________________________________________________________________________|____________|
   Brain                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Compression                          | 3                                                     3  4        4      |      7  3.4|
      Hemorrhage                           |                                                                          |      1  3.0|
      Hydrocephalus                        |                                                       2  3  2            |      3  2.3|
      Necrosis                             |                                                                          |      1  2.0|
                                           |__________________________________________________________________________|____________|
 _____________________________________________________________________________________________________________________|____________|
                                                                                                                                    
  * : Total animals with tissue examined microscopically; total animals with lesion and mean severity grade                         
  + : Tissue examined microscopically                M : Missing tissue                        1-4 : Lesion qualified as:           
  X : Lesion present but not qualified               A : Autolysis precludes examination               1) Minimal  3) Moderate      
  I : Insufficient tissue                        BLANK : Not examined                                  2) Mild     4) Marked        
                                                                                                                                    
                                                             Page  58                                                               
                                                                                                                                   
NTP Experiment-Test: 93023-06                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09  
Study Type: CHRONIC                                           2,4-HEXADIENAL                                      Date: 03/14/01    
Route: GAVAGE                                                                                                     Time: 15:02:06    
 __________________________________________________________________________________________________________________________________ 
                                           | 7| 7| 7| 7| 7| 6| 2| 7| 7| 7| 5| 7| 7| 5| 7| 7| 7| 7| 7| 5| 7| 6| 7| 6| 7|            |
                             DAY ON TEST   | 3| 3| 2| 2| 2| 5| 5| 3| 3| 3| 5| 3| 3| 8| 3| 3| 3| 3| 0| 4| 3| 3| 3| 3| 3|            |
                                           | 0| 0| 9| 9| 9| 5| 9| 0| 0| 0| 4| 2| 2| 7| 0| 0| 0| 1| 4| 2| 1| 4| 1| 4| 2|            |
 __________________________________________|__________________________________________________________________________|      T (*) |
                                           | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|      O     |
   FISCHER 344 RATS MALE                   | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|      T     |
                               ANIMAL ID   | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|      A     |
    0                                      | 2| 2| 2| 2| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 5|      L     |
    MG/KG/DY                               | 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0|            |
 _____________________________________________________________________________________________________________________|____________|
 NERVOUS SYSTEM - cont                     |                                                                          |            |
   Peripheral Nerve                        |                                                       +                  |   2        |
                                           |__________________________________________________________________________|____________|
   Spinal Cord                             |                                                       +                  |   2        |
 _____________________________________________________________________________________________________________________|            |
 RESPIRATORY SYSTEM                        |                                                                          |            |
                                           |__________________________________________________________________________|____________|
   Lung                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Congestion                           |                   3                                                      |      1  3.0|
      Edema                                |                   3                                            2         |      3  2.7|
      Foreign Body                         |                   X                                                      |      1     |
      Hemorrhage                           |                                     2        1     1                     |      4  1.5|
      Infiltration Cellular, Histiocyte    | 1  1  1  1  1  1     1           1  1  1     1        1        4  1     1|     33  1.2|
      Metaplasia, Osseous                  |                                                                          |      1  1.0|
      Alveolar Epithelium, Hyperplasia     |       1                                   1  2     3  2                  |      7  2.0|
                                           |__________________________________________________________________________|____________|
   Nose                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Foreign Body                         | X                 X           X                    X              X      |      5     |
      Inflammation, Chronic                | 2                       1                    1     1           2  1      |      9  1.4|
      Respiratory Epithelium, Hyperplasia  | 2                                                        1               |      2  1.5|
                                           |__________________________________________________________________________|____________|
   Trachea                                 | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
 _____________________________________________________________________________________________________________________|            |
 SPECIAL SENSES SYSTEM                     |                                                                          |            |
                                           |__________________________________________________________________________|____________|
   Eye                                     |                                                                          |   1        |
      Cataract                             |                                                                          |      1  3.0|
      Retina, Degeneration                 |                                                                          |      1  3.0|
                                           |__________________________________________________________________________|____________|
   Zymbal's Gland                          |                               +                                          |   2        |
 _____________________________________________________________________________________________________________________|            |
 URINARY SYSTEM                            |                                                                          |            |
                                           |__________________________________________________________________________|____________|
   Kidney                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Hydronephrosis                       |                                                       3                  |      1  3.0|
 _____________________________________________________________________________________________________________________|____________|
                                                                                                                                    
  * : Total animals with tissue examined microscopically; total animals with lesion and mean severity grade                         
  + : Tissue examined microscopically                M : Missing tissue                        1-4 : Lesion qualified as:           
  X : Lesion present but not qualified               A : Autolysis precludes examination               1) Minimal  3) Moderate      
  I : Insufficient tissue                        BLANK : Not examined                                  2) Mild     4) Marked        
                                                                                                                                    
                                                             Page  59                                                               
                                                                                                                                   
NTP Experiment-Test: 93023-06                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09  
Study Type: CHRONIC                                           2,4-HEXADIENAL                                      Date: 03/14/01    
Route: GAVAGE                                                                                                     Time: 15:02:06    
 __________________________________________________________________________________________________________________________________ 
                                           | 7| 7| 7| 7| 7| 6| 2| 7| 7| 7| 5| 7| 7| 5| 7| 7| 7| 7| 7| 5| 7| 6| 7| 6| 7|            |
                             DAY ON TEST   | 3| 3| 2| 2| 2| 5| 5| 3| 3| 3| 5| 3| 3| 8| 3| 3| 3| 3| 0| 4| 3| 3| 3| 3| 3|            |
                                           | 0| 0| 9| 9| 9| 5| 9| 0| 0| 0| 4| 2| 2| 7| 0| 0| 0| 1| 4| 2| 1| 4| 1| 4| 2|            |
 __________________________________________|__________________________________________________________________________|      T (*) |
                                           | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|      O     |
   FISCHER 344 RATS MALE                   | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|      T     |
                               ANIMAL ID   | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|      A     |
    0                                      | 2| 2| 2| 2| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 5|      L     |
    MG/KG/DY                               | 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0|            |
 _____________________________________________________________________________________________________________________|____________|
 URINARY SYSTEM - cont                     |                                                                          |            |
      Inflammation, Chronic                |             2                                                            |      3  2.3|
      Nephropathy                          | 1     1     2  1     1     1     1  1     1     1  1  1           1  1  1|     28  1.4|
      Renal Tubule, Dilatation             |                                                       3                  |      1  3.0|
      Renal Tubule, Necrosis               |                                                                          |      1  3.0|
                                           |__________________________________________________________________________|____________|
   Urinary Bladder                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Hemorrhage                           |                                                       4                  |      1  4.0|
      Inflammation, Suppurative            |                                                       3                  |      1  3.0|
 __________________________________________________________________________________________________________________________________ 
                                                                                                                                    
  * : Total animals with tissue examined microscopically; total animals with lesion and mean severity grade                         
  + : Tissue examined microscopically                M : Missing tissue                        1-4 : Lesion qualified as:           
  X : Lesion present but not qualified               A : Autolysis precludes examination               1) Minimal  3) Moderate      
  I : Insufficient tissue                        BLANK : Not examined                                  2) Mild     4) Marked        
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                             Page  60                                                               
                                                                                                                                   
NTP Experiment-Test: 93023-06                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09  
Study Type: CHRONIC                                           2,4-HEXADIENAL                                      Date: 03/14/01    
Route: GAVAGE                                                                                                     Time: 15:02:06    
 _____________________________________________________________________________________________________________________              
                                           | 6| 7| 6| 7| 7| 7| 7| 6| 7| 7| 3| 7| 7| 7| 7| 7| 7| 7| 7| 7| 7| 7| 5| 7| 7|             
                             DAY ON TEST   | 4| 3| 5| 3| 3| 3| 3| 7| 3| 3| 7| 3| 2| 2| 2| 3| 3| 3| 0| 0| 3| 3| 3| 3| 3|             
                                           | 3| 0| 9| 0| 0| 0| 1| 1| 1| 2| 1| 2| 9| 9| 9| 1| 1| 1| 4| 4| 0| 1| 7| 1| 0|             
 __________________________________________|__________________________________________________________________________|             
                                           | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|             
   FISCHER 344 RATS MALE                   | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|             
                               ANIMAL ID   | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|             
    22.5                                   | 5| 5| 5| 5| 5| 5| 5| 5| 5| 6| 6| 6| 6| 6| 6| 6| 6| 6| 6| 7| 7| 7| 7| 7| 7|             
    MG/KG/DY                               | 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5|             
 __________________________________________|__________________________________________________________________________|             
 ALIMENTARY SYSTEM                         |                                                                          |             
                                           |__________________________________________________________________________|             
   Esophagus                               | +  +  +  M  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Perforation                          |                                                                          |             
                                           |__________________________________________________________________________|             
   Intestine Large, Colon                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                           |__________________________________________________________________________|             
   Intestine Large, Rectum                 | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                           |__________________________________________________________________________|             
   Intestine Large, Cecum                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                           |__________________________________________________________________________|             
   Intestine Small, Duodenum               | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                           |__________________________________________________________________________|             
   Intestine Small, Jejunum                | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                           |__________________________________________________________________________|             
   Intestine Small, Ileum                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                           |__________________________________________________________________________|             
   Liver                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Basophilic Focus                     |    X        X  X  X  X  X  X     X           X     X  X  X  X  X  X  X  X|             
      Clear Cell Focus                     |                   X                    X                                 |             
      Degeneration, Cystic                 |                                                                          |             
      Eosinophilic Focus                   |          X                                                  X        X   |             
      Hemorrhage                           |                                                                          |             
      Hepatodiaphragmatic Nodule           |                                                       X  X               |             
      Infiltration Cellular, Mixed Cell    |             1                                                            |             
      Mixed Cell Focus                     |                         X                                                |             
      Bile Duct, Hyperplasia               |       1  1  1           1  2     1  2  3  2  1     1     1  1  1  1     1|             
      Centrilobular, Necrosis              | 3                                                                        |             
      Hepatocyte, Vacuolization Cytoplasmic|          2           3                          3  2           2     2   |             
      Kupffer Cell, Pigmentation           |                                                                          |             
                                           |__________________________________________________________________________|             
   Mesentery                               | +                          +     +        +                              |             
      Accessory Spleen                     |                                  X                                       |             
      Fat, Necrosis                        | 2                          3              2                              |             
                                           |__________________________________________________________________________|             
   Oral Mucosa                             | +                                                                        |             
      Hyperplasia                          | 3                                                                        |             
                                           |__________________________________________________________________________|             
   Pancreas                                | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
 __________________________________________|__________________________________________________________________________|             
                                                                                                                                    
                                                                                                                                    
                                                             Page  61                                                               
                                                                                                                                   
NTP Experiment-Test: 93023-06                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09  
Study Type: CHRONIC                                           2,4-HEXADIENAL                                      Date: 03/14/01    
Route: GAVAGE                                                                                                     Time: 15:02:06    
 _____________________________________________________________________________________________________________________              
                                           | 6| 7| 6| 7| 7| 7| 7| 6| 7| 7| 3| 7| 7| 7| 7| 7| 7| 7| 7| 7| 7| 7| 5| 7| 7|             
                             DAY ON TEST   | 4| 3| 5| 3| 3| 3| 3| 7| 3| 3| 7| 3| 2| 2| 2| 3| 3| 3| 0| 0| 3| 3| 3| 3| 3|             
                                           | 3| 0| 9| 0| 0| 0| 1| 1| 1| 2| 1| 2| 9| 9| 9| 1| 1| 1| 4| 4| 0| 1| 7| 1| 0|             
 __________________________________________|__________________________________________________________________________|             
                                           | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|             
   FISCHER 344 RATS MALE                   | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|             
                               ANIMAL ID   | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|             
    22.5                                   | 5| 5| 5| 5| 5| 5| 5| 5| 5| 6| 6| 6| 6| 6| 6| 6| 6| 6| 6| 7| 7| 7| 7| 7| 7|             
    MG/KG/DY                               | 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5|             
 __________________________________________|__________________________________________________________________________|             
 ALIMENTARY SYSTEM - cont                  |                                                                          |             
      Atrophy                              |                1  3     4        1  4        3              2        3  1|             
      Cyst                                 |                   3                                                  3   |             
      Acinus, Cytoplasmic Alteration       | 3                                                                        |             
      Acinus, Hyperplasia, Focal           |                   3  3     1     2     3                                 |             
                                           |__________________________________________________________________________|             
   Salivary Glands                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Atrophy                              |                                                                2         |             
                                           |__________________________________________________________________________|             
   Stomach, Forestomach                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Edema                                |                                                                   2      |             
      Epithelium, Hyperplasia              |    2     1  1  1  1  1  1           1                          1  2  1  2|             
                                           |__________________________________________________________________________|             
   Stomach, Glandular                      | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Erosion                              |                                                                   2      |             
      Ulcer                                | 3                                                                        |             
                                           |__________________________________________________________________________|             
   Tongue                                  |                                                                      +   |             
                                           |__________________________________________________________________________|             
   Tooth                                   |                                                 +                        |             
 _____________________________________________________________________________________________________________________|             
 CARDIOVASCULAR SYSTEM                     |                                                                          |             
                                           |__________________________________________________________________________|             
   Heart                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Cardiomyopathy                       | 2  2     1  2  1  3     2  2  3  2  2  3  3  1  3  2  2     3  2  1  3  3|             
 _____________________________________________________________________________________________________________________|             
 ENDOCRINE SYSTEM                          |                                                                          |             
                                           |__________________________________________________________________________|             
   Adrenal Cortex                          | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Accessory Adrenal Cortical Nodule    |    3  3     3  3  3  3  3                 3  3  3           3  3     3  3|             
      Angiectasis                          |                                                                          |             
      Degeneration, Fatty                  |                            4                 2     1     1               |             
      Hyperplasia, Focal                   |                                           2                              |             
      Hypertrophy, Focal                   |                                     1        2                           |             
      Metaplasia, Osseous                  |                3                                                         |             
                                           |__________________________________________________________________________|             
   Adrenal Medulla                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Hyperplasia                          |          1           1                       2                           |             
                                           |__________________________________________________________________________|             
 __________________________________________|__________________________________________________________________________|             
                                                                                                                                    
                                                                                                                                    
                                                             Page  62                                                               
                                                                                                                                   
NTP Experiment-Test: 93023-06                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09  
Study Type: CHRONIC                                           2,4-HEXADIENAL                                      Date: 03/14/01    
Route: GAVAGE                                                                                                     Time: 15:02:06    
 _____________________________________________________________________________________________________________________              
                                           | 6| 7| 6| 7| 7| 7| 7| 6| 7| 7| 3| 7| 7| 7| 7| 7| 7| 7| 7| 7| 7| 7| 5| 7| 7|             
                             DAY ON TEST   | 4| 3| 5| 3| 3| 3| 3| 7| 3| 3| 7| 3| 2| 2| 2| 3| 3| 3| 0| 0| 3| 3| 3| 3| 3|             
                                           | 3| 0| 9| 0| 0| 0| 1| 1| 1| 2| 1| 2| 9| 9| 9| 1| 1| 1| 4| 4| 0| 1| 7| 1| 0|             
 __________________________________________|__________________________________________________________________________|             
                                           | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|             
   FISCHER 344 RATS MALE                   | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|             
                               ANIMAL ID   | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|             
    22.5                                   | 5| 5| 5| 5| 5| 5| 5| 5| 5| 6| 6| 6| 6| 6| 6| 6| 6| 6| 6| 7| 7| 7| 7| 7| 7|             
    MG/KG/DY                               | 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5|             
 __________________________________________|__________________________________________________________________________|             
 ENDOCRINE SYSTEM - cont                   |                                                                          |             
   Islets, Pancreatic                      | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                           |__________________________________________________________________________|             
   Parathyroid Gland                       | +  +  +  M  +  +  +  +  +  +  +  +  +  +  +  M  +  +  +  +  +  +  +  +  M|             
                                           |__________________________________________________________________________|             
   Pituitary Gland                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Pars Distalis, Angiectasis           |             3                                                            |             
      Pars Distalis, Cyst                  |                                                                          |             
      Pars Distalis, Hyperplasia, Focal    |                2                                                         |             
                                           |__________________________________________________________________________|             
   Thyroid Gland                           | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      C-Cell, Hyperplasia                  |                                  1  2        3  1           1        3  2|             
 _____________________________________________________________________________________________________________________|             
 GENERAL BODY SYSTEM                       |                                                                          |             
                                           |__________________________________________________________________________|             
   Peritoneum                              |                                                                          |             
 _____________________________________________________________________________________________________________________|             
 GENITAL SYSTEM                            |                                                                          |             
                                           |__________________________________________________________________________|             
   Epididymis                              | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Atypia Cellular                      | 3  2     2  3  3  2  3  3        3        4  2  2  3        3  3     3  3|             
                                           |__________________________________________________________________________|             
   Preputial Gland                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Cyst                                 |                                                                         3|             
      Inflammation, Chronic                |    2        2     2              2     2  2        2        2        2   |             
                                           |__________________________________________________________________________|             
   Prostate                                | +  +  +  +  +  +  I  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Inflammation, Chronic                | 2  3                 2              3        3  2  2  4  2  3  2        2|             
      Epithelium, Ventral, Hyperplasia     |       1  1                 1                       2  1     2            |             
                                           |__________________________________________________________________________|             
   Seminal Vesicle                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                           |__________________________________________________________________________|             
   Testes                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Germinal Epithelium, Atrophy         |    2  1              4                             3  1  1     3         |             
      Interstitial Cell, Hyperplasia       |    2  1                                            1  1  1     3  2      |             
 _____________________________________________________________________________________________________________________|             
 HEMATOPOIETIC SYSTEM                      |                                                                          |             
                                           |__________________________________________________________________________|             
   Bone Marrow                             | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
 __________________________________________|__________________________________________________________________________|             
                                                                                                                                    
                                                                                                                                    
                                                             Page  63                                                               
                                                                                                                                   
NTP Experiment-Test: 93023-06                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09  
Study Type: CHRONIC                                           2,4-HEXADIENAL                                      Date: 03/14/01    
Route: GAVAGE                                                                                                     Time: 15:02:06    
 _____________________________________________________________________________________________________________________              
                                           | 6| 7| 6| 7| 7| 7| 7| 6| 7| 7| 3| 7| 7| 7| 7| 7| 7| 7| 7| 7| 7| 7| 5| 7| 7|             
                             DAY ON TEST   | 4| 3| 5| 3| 3| 3| 3| 7| 3| 3| 7| 3| 2| 2| 2| 3| 3| 3| 0| 0| 3| 3| 3| 3| 3|             
                                           | 3| 0| 9| 0| 0| 0| 1| 1| 1| 2| 1| 2| 9| 9| 9| 1| 1| 1| 4| 4| 0| 1| 7| 1| 0|             
 __________________________________________|__________________________________________________________________________|             
                                           | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|             
   FISCHER 344 RATS MALE                   | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|             
                               ANIMAL ID   | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|             
    22.5                                   | 5| 5| 5| 5| 5| 5| 5| 5| 5| 6| 6| 6| 6| 6| 6| 6| 6| 6| 6| 7| 7| 7| 7| 7| 7|             
    MG/KG/DY                               | 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5|             
 __________________________________________|__________________________________________________________________________|             
 HEMATOPOIETIC SYSTEM - cont               |                                                                          |             
      Hyperplasia                          | 2                    4                                                   |             
                                           |__________________________________________________________________________|             
   Lymph Node                              |    +  +  +     +     +  +  +     +  +        +        +  +     +     +  +|             
      Iliac, Pigmentation                  |                                                                          |             
      Mediastinal, Hemorrhage              |                                                                          |             
      Mediastinal, Hyperplasia, Lymphoid   |          2                                                     3         |             
      Pancreatic, Hemorrhage               |       1        1     1  1  2                                   2     1   |             
      Pancreatic, Hyperplasia, Lymphoid    |    2           1        2  1                 1           2     2        3|             
      Pancreatic, Pigmentation             |    1  1        2        1  1        1        1           2     3        3|             
                                           |__________________________________________________________________________|             
   Lymph Node, Mandibular                  | M  M  M  M  M  M  M  M  M  M  M  M  +  M  M  M  M  M  M  M  M  M  M  M  M|             
                                           |__________________________________________________________________________|             
   Lymph Node, Mesenteric                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Ectasia                              |          2           2                                                   |             
      Hemorrhage                           |    1     2     2                                      2     1            |             
      Hyperplasia, Lymphoid                |             2                                      2           2         |             
      Pigmentation                         | 2  3     2  2  3  3     2  2              2  2  2  3  2  2     2  2  2   |             
                                           |__________________________________________________________________________|             
   Spleen                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Hematopoietic Cell Proliferation     | 3           1  1     4        3        2     1           2     1     1  1|             
      Pigmentation                         |       4                                   2     2        2               |             
      Lymphoid Follicle, Hyperplasia       |                                                                          |             
                                           |__________________________________________________________________________|             
   Thymus                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Hemorrhage                           |                                                                          |             
 _____________________________________________________________________________________________________________________|             
 INTEGUMENTARY SYSTEM                      |                                                                          |             
                                           |__________________________________________________________________________|             
   Mammary Gland                           | +  +  +  +  +  +  +  +  +  +  +  +  M  +  +  +  +  +  +  +  +  +  M  +  +|             
      Hyperplasia                          |    2  3  2        2              2     3              3  2  4        2   |             
                                           |__________________________________________________________________________|             
   Skin                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
 _____________________________________________________________________________________________________________________|             
 MUSCULOSKELETAL SYSTEM                    |                                                                          |             
                                           |__________________________________________________________________________|             
   Bone                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                           |__________________________________________________________________________|             
   Skeletal Muscle                         |                         +        +                    +                  |             
 __________________________________________|__________________________________________________________________________|             
                                                                                                                                    
                                                                                                                                    
                                                             Page  64                                                               
                                                                                                                                   
NTP Experiment-Test: 93023-06                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09  
Study Type: CHRONIC                                           2,4-HEXADIENAL                                      Date: 03/14/01    
Route: GAVAGE                                                                                                     Time: 15:02:06    
 _____________________________________________________________________________________________________________________              
                                           | 6| 7| 6| 7| 7| 7| 7| 6| 7| 7| 3| 7| 7| 7| 7| 7| 7| 7| 7| 7| 7| 7| 5| 7| 7|             
                             DAY ON TEST   | 4| 3| 5| 3| 3| 3| 3| 7| 3| 3| 7| 3| 2| 2| 2| 3| 3| 3| 0| 0| 3| 3| 3| 3| 3|             
                                           | 3| 0| 9| 0| 0| 0| 1| 1| 1| 2| 1| 2| 9| 9| 9| 1| 1| 1| 4| 4| 0| 1| 7| 1| 0|             
 __________________________________________|__________________________________________________________________________|             
                                           | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|             
   FISCHER 344 RATS MALE                   | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|             
                               ANIMAL ID   | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|             
    22.5                                   | 5| 5| 5| 5| 5| 5| 5| 5| 5| 6| 6| 6| 6| 6| 6| 6| 6| 6| 6| 7| 7| 7| 7| 7| 7|             
    MG/KG/DY                               | 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5|             
 __________________________________________|__________________________________________________________________________|             
 NERVOUS SYSTEM                            |                                                                          |             
                                           |__________________________________________________________________________|             
   Brain                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Compression                          |       4                                                  3               |             
      Hydrocephalus                        |       2                                                                  |             
                                           |__________________________________________________________________________|             
   Peripheral Nerve                        |                         +                             +                  |             
                                           |__________________________________________________________________________|             
   Spinal Cord                             |                         +                             +                  |             
 _____________________________________________________________________________________________________________________|             
 RESPIRATORY SYSTEM                        |                                                                          |             
                                           |__________________________________________________________________________|             
   Lung                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Congestion                           |                                                                          |             
      Edema                                |                                                                          |             
      Hemorrhage                           |                         2                                         4      |             
      Infiltration Cellular, Histiocyte    | 1  1     1           2  1  1        1  1     1  2  1        1            |             
      Inflammation, Suppurative            |                                                                          |             
      Alveolar Epithelium, Hyperplasia     |                         2                                                |             
                                           |__________________________________________________________________________|             
   Nose                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Foreign Body                         |                   X                                X  X           X      |             
      Inflammation, Chronic                |             3     1                       3  3                           |             
      Respiratory Epithelium, Hyperplasia  |             2                             2  2     1                     |             
      Respiratory Epithelium, Metaplasia,  |                                                                          |             
           Squamous                        |                   2                          2                           |             
                                           |__________________________________________________________________________|             
   Trachea                                 | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Epithelium, Hyperplasia              |          3                                                               |             
 _____________________________________________________________________________________________________________________|             
 SPECIAL SENSES SYSTEM                     |                                                                          |             
                                           |__________________________________________________________________________|             
   Eye                                     |                   +                                                      |             
      Cataract                             |                   4                                                      |             
      Retina, Degeneration                 |                   4                                                      |             
                                           |__________________________________________________________________________|             
   Zymbal's Gland                          |                                                 +                        |             
 _____________________________________________________________________________________________________________________|             
 URINARY SYSTEM                            |                                                                          |             
 __________________________________________|__________________________________________________________________________|             
                                                                                                                                    
                                                                                                                                    
                                                             Page  65                                                               
                                                                                                                                   
NTP Experiment-Test: 93023-06                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09  
Study Type: CHRONIC                                           2,4-HEXADIENAL                                      Date: 03/14/01    
Route: GAVAGE                                                                                                     Time: 15:02:06    
 _____________________________________________________________________________________________________________________              
                                           | 6| 7| 6| 7| 7| 7| 7| 6| 7| 7| 3| 7| 7| 7| 7| 7| 7| 7| 7| 7| 7| 7| 5| 7| 7|             
                             DAY ON TEST   | 4| 3| 5| 3| 3| 3| 3| 7| 3| 3| 7| 3| 2| 2| 2| 3| 3| 3| 0| 0| 3| 3| 3| 3| 3|             
                                           | 3| 0| 9| 0| 0| 0| 1| 1| 1| 2| 1| 2| 9| 9| 9| 1| 1| 1| 4| 4| 0| 1| 7| 1| 0|             
 __________________________________________|__________________________________________________________________________|             
                                           | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|             
   FISCHER 344 RATS MALE                   | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|             
                               ANIMAL ID   | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|             
    22.5                                   | 5| 5| 5| 5| 5| 5| 5| 5| 5| 6| 6| 6| 6| 6| 6| 6| 6| 6| 6| 7| 7| 7| 7| 7| 7|             
    MG/KG/DY                               | 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5|             
 __________________________________________|__________________________________________________________________________|             
 URINARY SYSTEM - cont                     |                                                                          |             
                                           |__________________________________________________________________________|             
   Kidney                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Hydronephrosis                       |                                                                   2      |             
      Infarct                              |                                                                          |             
      Inflammation, Chronic                |                   2                    3                             2   |             
      Nephropathy                          | 2  1  1  1  1  1  1                    3     1           1     1     2   |             
      Renal Tubule, Dilatation             |                                                                   2      |             
      Renal Tubule, Necrosis               | 2                                                                        |             
      Transitional Epithelium, Hyperplasia |                                                       2                  |             
                                           |__________________________________________________________________________|             
   Urinary Bladder                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Edema                                |                                                                          |             
      Hemorrhage                           |                                                                   4      |             
      Inflammation, Chronic                |                                                                          |             
      Transitional Epithelium, Hyperplasia |                                                       2                  |             
 __________________________________________|__________________________________________________________________________              
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                             Page  66                                                               
                                                                                                                                   
NTP Experiment-Test: 93023-06                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09  
Study Type: CHRONIC                                           2,4-HEXADIENAL                                      Date: 03/14/01    
Route: GAVAGE                                                                                                     Time: 15:02:06    
 __________________________________________________________________________________________________________________________________ 
                                           | 6| 7| 7| 7| 7| 6| 7| 7| 1| 7| 7| 5| 7| 6| 7| 7| 7| 7| 7| 3| 7| 5| 7| 7| 7|            |
                             DAY ON TEST   | 6| 3| 3| 3| 3| 6| 3| 3| 9| 3| 1| 8| 2| 3| 2| 2| 2| 2| 2| 4| 3| 0| 3| 3| 3|            |
                                           | 4| 0| 0| 0| 0| 2| 0| 0| 0| 0| 5| 2| 9| 4| 9| 9| 9| 9| 9| 5| 0| 9| 0| 0| 0|            |
 __________________________________________|__________________________________________________________________________|      T (*) |
                                           | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|      O     |
   FISCHER 344 RATS MALE                   | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|      T     |
                               ANIMAL ID   | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 1|      A     |
    22.5                                   | 7| 7| 7| 7| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 0|      L     |
    MG/KG/DY                               | 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0|            |
 _____________________________________________________________________________________________________________________|____________|
 ALIMENTARY SYSTEM                         |                                                                          |            |
                                           |__________________________________________________________________________|____________|
   Esophagus                               | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  49        |
      Perforation                          |                         X                                                |      1     |
                                           |__________________________________________________________________________|____________|
   Intestine Large, Colon                  | +  +  +  +  +  +  M  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  49        |
                                           |__________________________________________________________________________|____________|
   Intestine Large, Rectum                 | +  +  +  +  +  +  +  +  +  +  M  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  49        |
                                           |__________________________________________________________________________|____________|
   Intestine Large, Cecum                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
                                           |__________________________________________________________________________|____________|
   Intestine Small, Duodenum               | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
                                           |__________________________________________________________________________|____________|
   Intestine Small, Jejunum                | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
                                           |__________________________________________________________________________|____________|
   Intestine Small, Ileum                  | +  +  +  +  +  +  +  +  M  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  49        |
                                           |__________________________________________________________________________|____________|
   Liver                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Basophilic Focus                     |    X  X  X        X  X              X     X  X  X  X  X     X     X  X  X|     32     |
      Clear Cell Focus                     |                            X                       X  X                 X|      6     |
      Degeneration, Cystic                 |                                                 1                        |      1  1.0|
      Eosinophilic Focus                   |                   X           X              X     X  X     X            |      9     |
      Hemorrhage                           |                            2                                             |      1  2.0|
      Hepatodiaphragmatic Nodule           |       X  X  X                                                        X  X|      7     |
      Infiltration Cellular, Mixed Cell    |                                                                1         |      2  1.0|
      Mixed Cell Focus                     |    X  X  X                                      X     X              X   |      7     |
      Bile Duct, Hyperplasia               |    3  1  2  1     2  1     1  1     2  2  1  1  1  1  2     2     1  1   |     34  1.4|
      Centrilobular, Necrosis              |                                                                          |      1  3.0|
      Hepatocyte, Vacuolization Cytoplasmic| 3                                2                       2               |      9  2.3|
      Kupffer Cell, Pigmentation           |                                                 2                        |      1  2.0|
                                           |__________________________________________________________________________|____________|
   Mesentery                               | +                                               +  +  +                  |   8        |
      Accessory Spleen                     |                                                                          |      1     |
      Fat, Necrosis                        | 3                                               3  4  3                  |      7  2.9|
                                           |__________________________________________________________________________|____________|
 _____________________________________________________________________________________________________________________|____________|
                                                                                                                                    
  * : Total animals with tissue examined microscopically; total animals with lesion and mean severity grade                         
  + : Tissue examined microscopically                M : Missing tissue                        1-4 : Lesion qualified as:           
  X : Lesion present but not qualified               A : Autolysis precludes examination               1) Minimal  3) Moderate      
  I : Insufficient tissue                        BLANK : Not examined                                  2) Mild     4) Marked        
                                                                                                                                    
                                                             Page  67                                                               
                                                                                                                                   
NTP Experiment-Test: 93023-06                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09  
Study Type: CHRONIC                                           2,4-HEXADIENAL                                      Date: 03/14/01    
Route: GAVAGE                                                                                                     Time: 15:02:06    
 __________________________________________________________________________________________________________________________________ 
                                           | 6| 7| 7| 7| 7| 6| 7| 7| 1| 7| 7| 5| 7| 6| 7| 7| 7| 7| 7| 3| 7| 5| 7| 7| 7|            |
                             DAY ON TEST   | 6| 3| 3| 3| 3| 6| 3| 3| 9| 3| 1| 8| 2| 3| 2| 2| 2| 2| 2| 4| 3| 0| 3| 3| 3|            |
                                           | 4| 0| 0| 0| 0| 2| 0| 0| 0| 0| 5| 2| 9| 4| 9| 9| 9| 9| 9| 5| 0| 9| 0| 0| 0|            |
 __________________________________________|__________________________________________________________________________|      T (*) |
                                           | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|      O     |
   FISCHER 344 RATS MALE                   | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|      T     |
                               ANIMAL ID   | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 1|      A     |
    22.5                                   | 7| 7| 7| 7| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 0|      L     |
    MG/KG/DY                               | 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0|            |
 _____________________________________________________________________________________________________________________|____________|
 ALIMENTARY SYSTEM - cont                  |                                                                          |            |
   Oral Mucosa                             |                                                                          |   1        |
      Hyperplasia                          |                                                                          |      1  3.0|
                                           |__________________________________________________________________________|____________|
   Pancreas                                | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Atrophy                              |             2     3  3                       2     1                     |     14  2.4|
      Cyst                                 |       3                                                                  |      3  3.0|
      Acinus, Cytoplasmic Alteration       |                         3                                                |      2  3.0|
      Acinus, Hyperplasia, Focal           |    3  3     2              3        1        2        2           3      |     13  2.4|
                                           |__________________________________________________________________________|____________|
   Salivary Glands                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Atrophy                              |                                                                          |      1  2.0|
                                           |__________________________________________________________________________|____________|
   Stomach, Forestomach                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Edema                                |                3                                                         |      2  2.5|
      Epithelium, Hyperplasia              |                3           2        1        1  1           1     1      |     19  1.3|
                                           |__________________________________________________________________________|____________|
   Stomach, Glandular                      | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Erosion                              |                                                                          |      1  2.0|
      Ulcer                                |                                                                          |      1  3.0|
                                           |__________________________________________________________________________|____________|
   Tongue                                  |                                                                          |   1        |
                                           |__________________________________________________________________________|____________|
   Tooth                                   |                                                                          |   1        |
 _____________________________________________________________________________________________________________________|            |
 CARDIOVASCULAR SYSTEM                     |                                                                          |            |
                                           |__________________________________________________________________________|____________|
   Heart                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Cardiomyopathy                       |    2  3     2     1  2     3     2  2     2  3  3  3  1  1  1     3  2  3|     40  2.2|
 _____________________________________________________________________________________________________________________|            |
 ENDOCRINE SYSTEM                          |                                                                          |            |
                                           |__________________________________________________________________________|____________|
   Adrenal Cortex                          | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Accessory Adrenal Cortical Nodule    |                   3           3  3              3     3              3  3|     21  3.0|
      Angiectasis                          |                                                                   3      |      1  3.0|
 _____________________________________________________________________________________________________________________|____________|
                                                                                                                                    
  * : Total animals with tissue examined microscopically; total animals with lesion and mean severity grade                         
  + : Tissue examined microscopically                M : Missing tissue                        1-4 : Lesion qualified as:           
  X : Lesion present but not qualified               A : Autolysis precludes examination               1) Minimal  3) Moderate      
  I : Insufficient tissue                        BLANK : Not examined                                  2) Mild     4) Marked        
                                                                                                                                    
                                                             Page  68                                                               
                                                                                                                                   
NTP Experiment-Test: 93023-06                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09  
Study Type: CHRONIC                                           2,4-HEXADIENAL                                      Date: 03/14/01    
Route: GAVAGE                                                                                                     Time: 15:02:06    
 __________________________________________________________________________________________________________________________________ 
                                           | 6| 7| 7| 7| 7| 6| 7| 7| 1| 7| 7| 5| 7| 6| 7| 7| 7| 7| 7| 3| 7| 5| 7| 7| 7|            |
                             DAY ON TEST   | 6| 3| 3| 3| 3| 6| 3| 3| 9| 3| 1| 8| 2| 3| 2| 2| 2| 2| 2| 4| 3| 0| 3| 3| 3|            |
                                           | 4| 0| 0| 0| 0| 2| 0| 0| 0| 0| 5| 2| 9| 4| 9| 9| 9| 9| 9| 5| 0| 9| 0| 0| 0|            |
 __________________________________________|__________________________________________________________________________|      T (*) |
                                           | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|      O     |
   FISCHER 344 RATS MALE                   | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|      T     |
                               ANIMAL ID   | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 1|      A     |
    22.5                                   | 7| 7| 7| 7| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 0|      L     |
    MG/KG/DY                               | 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0|            |
 _____________________________________________________________________________________________________________________|____________|
 ENDOCRINE SYSTEM - cont                   |                                                                          |            |
      Degeneration, Fatty                  | 3              3                                   3           2         |      8  2.4|
      Hyperplasia, Focal                   |                                                             1            |      2  1.5|
      Hypertrophy, Focal                   |                                                    2                     |      3  1.7|
      Metaplasia, Osseous                  |                                                                          |      1  3.0|
                                           |__________________________________________________________________________|____________|
   Adrenal Medulla                         | +  +  +  +  +  +  +  M  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  49        |
      Hyperplasia                          | 3     1  2        1                          3     1        1            |     10  1.6|
                                           |__________________________________________________________________________|____________|
   Islets, Pancreatic                      | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
                                           |__________________________________________________________________________|____________|
   Parathyroid Gland                       | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  47        |
                                           |__________________________________________________________________________|____________|
   Pituitary Gland                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Pars Distalis, Angiectasis           |                                                 2     3                 2|      4  2.5|
      Pars Distalis, Cyst                  |                               3                                          |      1  3.0|
      Pars Distalis, Hyperplasia, Focal    |                               1     3        3  3  1  3           2      |      8  2.3|
                                           |__________________________________________________________________________|____________|
   Thyroid Gland                           | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      C-Cell, Hyperplasia                  | 2     1           3        1  1     1              3              2     1|     16  1.8|
 _____________________________________________________________________________________________________________________|            |
 GENERAL BODY SYSTEM                       |                                                                          |            |
                                           |__________________________________________________________________________|____________|
   Peritoneum                              |                   +                                                      |   1        |
 _____________________________________________________________________________________________________________________|            |
 GENITAL SYSTEM                            |                                                                          |            |
                                           |__________________________________________________________________________|____________|
   Epididymis                              | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Atypia Cellular                      | 2  2  3  3        2  3     2  3     2  3  3  3  2  2  3     4     3  3  2|     36  2.7|
                                           |__________________________________________________________________________|____________|
   Preputial Gland                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Cyst                                 |                                                                          |      1  3.0|
      Inflammation, Chronic                |       3     2     2  3     2        3     2  2  2  3              3     2|     21  2.2|
                                           |__________________________________________________________________________|____________|
   Prostate                                | +  +  +  +  +  +  +  I  +  +  +  +  +  I  +  +  +  +  +  +  +  +  +  +  +|  47        |
 _____________________________________________________________________________________________________________________|____________|
                                                                                                                                    
  * : Total animals with tissue examined microscopically; total animals with lesion and mean severity grade                         
  + : Tissue examined microscopically                M : Missing tissue                        1-4 : Lesion qualified as:           
  X : Lesion present but not qualified               A : Autolysis precludes examination               1) Minimal  3) Moderate      
  I : Insufficient tissue                        BLANK : Not examined                                  2) Mild     4) Marked        
                                                                                                                                    
                                                             Page  69                                                               
                                                                                                                                   
NTP Experiment-Test: 93023-06                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09  
Study Type: CHRONIC                                           2,4-HEXADIENAL                                      Date: 03/14/01    
Route: GAVAGE                                                                                                     Time: 15:02:06    
 __________________________________________________________________________________________________________________________________ 
                                           | 6| 7| 7| 7| 7| 6| 7| 7| 1| 7| 7| 5| 7| 6| 7| 7| 7| 7| 7| 3| 7| 5| 7| 7| 7|            |
                             DAY ON TEST   | 6| 3| 3| 3| 3| 6| 3| 3| 9| 3| 1| 8| 2| 3| 2| 2| 2| 2| 2| 4| 3| 0| 3| 3| 3|            |
                                           | 4| 0| 0| 0| 0| 2| 0| 0| 0| 0| 5| 2| 9| 4| 9| 9| 9| 9| 9| 5| 0| 9| 0| 0| 0|            |
 __________________________________________|__________________________________________________________________________|      T (*) |
                                           | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|      O     |
   FISCHER 344 RATS MALE                   | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|      T     |
                               ANIMAL ID   | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 1|      A     |
    22.5                                   | 7| 7| 7| 7| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 0|      L     |
    MG/KG/DY                               | 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0|            |
 _____________________________________________________________________________________________________________________|____________|
 GENITAL SYSTEM - cont                     |                                                                          |            |
      Inflammation, Chronic                |    2                          2                       3        4     2   |     17  2.5|
      Epithelium, Ventral, Hyperplasia     |                               2           1           1                  |      9  1.3|
                                           |__________________________________________________________________________|____________|
   Seminal Vesicle                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
                                           |__________________________________________________________________________|____________|
   Testes                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Germinal Epithelium, Atrophy         |       2                                                     4            |      9  2.3|
      Interstitial Cell, Hyperplasia       |                                                                          |      7  1.6|
 _____________________________________________________________________________________________________________________|            |
 HEMATOPOIETIC SYSTEM                      |                                                                          |            |
                                           |__________________________________________________________________________|____________|
   Bone Marrow                             | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Hyperplasia                          |                                                             4            |      3  3.3|
                                           |__________________________________________________________________________|____________|
   Lymph Node                              |    +           +     +     +  +        +  +  +  +  +  +  M           +   |  27        |
      Iliac, Pigmentation                  |    2                                                                     |      1  2.0|
      Mediastinal, Hemorrhage              |                                              1                           |      1  1.0|
      Mediastinal, Hyperplasia, Lymphoid   |                                              3        3                  |      4  2.8|
      Pancreatic, Hemorrhage               |                            1  2                                          |      9  1.3|
      Pancreatic, Hyperplasia, Lymphoid    |    1                 2                    1     3  1                 3   |     14  1.8|
      Pancreatic, Pigmentation             |                      2     1  1        1  1     2  1                 1   |     18  1.4|
                                           |__________________________________________________________________________|____________|
   Lymph Node, Mandibular                  | M  M  M  M  M  M  M  M  M  M  M  M  M  M  M  M  M  M  M  M  M  M  M  M  M|   1        |
                                           |__________________________________________________________________________|____________|
   Lymph Node, Mesenteric                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Ectasia                              |                                                                          |      2  2.0|
      Hemorrhage                           |             1              1     3                                       |      8  1.6|
      Hyperplasia, Lymphoid                |       3                 3  2                 2        2                 2|      9  2.2|
      Pigmentation                         | 2  3  3     2     2        3  2  2  2  2  2     2     3              3  2|     32  2.3|
                                           |__________________________________________________________________________|____________|
   Spleen                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Hematopoietic Cell Proliferation     |          1                 1     2  2     1     1  2        3     2      |     20  1.8|
      Pigmentation                         |             2           2     3                          2              2|      9  2.3|
      Lymphoid Follicle, Hyperplasia       |                                                             3            |      1  3.0|
 _____________________________________________________________________________________________________________________|____________|
                                                                                                                                    
  * : Total animals with tissue examined microscopically; total animals with lesion and mean severity grade                         
  + : Tissue examined microscopically                M : Missing tissue                        1-4 : Lesion qualified as:           
  X : Lesion present but not qualified               A : Autolysis precludes examination               1) Minimal  3) Moderate      
  I : Insufficient tissue                        BLANK : Not examined                                  2) Mild     4) Marked        
                                                                                                                                    
                                                             Page  70                                                               
                                                                                                                                   
NTP Experiment-Test: 93023-06                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09  
Study Type: CHRONIC                                           2,4-HEXADIENAL                                      Date: 03/14/01    
Route: GAVAGE                                                                                                     Time: 15:02:06    
 __________________________________________________________________________________________________________________________________ 
                                           | 6| 7| 7| 7| 7| 6| 7| 7| 1| 7| 7| 5| 7| 6| 7| 7| 7| 7| 7| 3| 7| 5| 7| 7| 7|            |
                             DAY ON TEST   | 6| 3| 3| 3| 3| 6| 3| 3| 9| 3| 1| 8| 2| 3| 2| 2| 2| 2| 2| 4| 3| 0| 3| 3| 3|            |
                                           | 4| 0| 0| 0| 0| 2| 0| 0| 0| 0| 5| 2| 9| 4| 9| 9| 9| 9| 9| 5| 0| 9| 0| 0| 0|            |
 __________________________________________|__________________________________________________________________________|      T (*) |
                                           | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|      O     |
   FISCHER 344 RATS MALE                   | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|      T     |
                               ANIMAL ID   | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 1|      A     |
    22.5                                   | 7| 7| 7| 7| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 0|      L     |
    MG/KG/DY                               | 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0|            |
 _____________________________________________________________________________________________________________________|____________|
 HEMATOPOIETIC SYSTEM - cont               |                                                                          |            |
                                           |__________________________________________________________________________|____________|
   Thymus                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  M  +  +  +|  49        |
      Hemorrhage                           |                                                          4               |      1  4.0|
 _____________________________________________________________________________________________________________________|            |
 INTEGUMENTARY SYSTEM                      |                                                                          |            |
                                           |__________________________________________________________________________|____________|
   Mammary Gland                           | +  +  +  +  +  +  M  +  M  +  +  +  +  +  M  +  +  +  +  +  +  +  +  +  +|  45        |
      Hyperplasia                          |                                  1                                      2|     12  2.3|
                                           |__________________________________________________________________________|____________|
   Skin                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
 _____________________________________________________________________________________________________________________|            |
 MUSCULOSKELETAL SYSTEM                    |                                                                          |            |
                                           |__________________________________________________________________________|____________|
   Bone                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
                                           |__________________________________________________________________________|____________|
   Skeletal Muscle                         |                +        +     +                                          |   6        |
 _____________________________________________________________________________________________________________________|            |
 NERVOUS SYSTEM                            |                                                                          |            |
                                           |__________________________________________________________________________|____________|
   Brain                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Compression                          |             4                                                            |      3  3.7|
      Hydrocephalus                        |                2                                                         |      2  2.0|
                                           |__________________________________________________________________________|____________|
   Peripheral Nerve                        |                +              +                                          |   4        |
                                           |__________________________________________________________________________|____________|
   Spinal Cord                             |                +              +                                          |   4        |
 _____________________________________________________________________________________________________________________|            |
 RESPIRATORY SYSTEM                        |                                                                          |            |
                                           |__________________________________________________________________________|____________|
   Lung                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Congestion                           |                                                          4               |      1  4.0|
      Edema                                |                                                          3               |      1  3.0|
      Hemorrhage                           |                   1                                                      |      3  2.3|
      Infiltration Cellular, Histiocyte    | 1        1  1        1     1  1  1  1     1  1     1        2        1   |     25  1.1|
 _____________________________________________________________________________________________________________________|____________|
                                                                                                                                    
  * : Total animals with tissue examined microscopically; total animals with lesion and mean severity grade                         
  + : Tissue examined microscopically                M : Missing tissue                        1-4 : Lesion qualified as:           
  X : Lesion present but not qualified               A : Autolysis precludes examination               1) Minimal  3) Moderate      
  I : Insufficient tissue                        BLANK : Not examined                                  2) Mild     4) Marked        
                                                                                                                                    
                                                             Page  71                                                               
                                                                                                                                   
NTP Experiment-Test: 93023-06                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09  
Study Type: CHRONIC                                           2,4-HEXADIENAL                                      Date: 03/14/01    
Route: GAVAGE                                                                                                     Time: 15:02:06    
 __________________________________________________________________________________________________________________________________ 
                                           | 6| 7| 7| 7| 7| 6| 7| 7| 1| 7| 7| 5| 7| 6| 7| 7| 7| 7| 7| 3| 7| 5| 7| 7| 7|            |
                             DAY ON TEST   | 6| 3| 3| 3| 3| 6| 3| 3| 9| 3| 1| 8| 2| 3| 2| 2| 2| 2| 2| 4| 3| 0| 3| 3| 3|            |
                                           | 4| 0| 0| 0| 0| 2| 0| 0| 0| 0| 5| 2| 9| 4| 9| 9| 9| 9| 9| 5| 0| 9| 0| 0| 0|            |
 __________________________________________|__________________________________________________________________________|      T (*) |
                                           | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|      O     |
   FISCHER 344 RATS MALE                   | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|      T     |
                               ANIMAL ID   | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 1|      A     |
    22.5                                   | 7| 7| 7| 7| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 0|      L     |
    MG/KG/DY                               | 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0|            |
 _____________________________________________________________________________________________________________________|____________|
 RESPIRATORY SYSTEM - cont                 |                                                                          |            |
      Inflammation, Suppurative            |                         3                                                |      1  3.0|
      Alveolar Epithelium, Hyperplasia     |             2                                               3     3      |      4  2.5|
                                           |__________________________________________________________________________|____________|
   Nose                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Foreign Body                         |          X                                               X               |      6     |
      Inflammation, Chronic                |          2        3  2        1  2                       3               |     10  2.3|
      Respiratory Epithelium, Hyperplasia  |          2        3  2                                                   |      7  2.0|
      Respiratory Epithelium, Metaplasia,  |                                                                          |            |
           Squamous                        |          1                                                               |      3  1.7|
                                           |__________________________________________________________________________|____________|
   Trachea                                 | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Epithelium, Hyperplasia              |                                                                          |      1  3.0|
 _____________________________________________________________________________________________________________________|            |
 SPECIAL SENSES SYSTEM                     |                                                                          |            |
                                           |__________________________________________________________________________|____________|
   Eye                                     |                +                                                         |   2        |
      Cataract                             |                3                                                         |      2  3.5|
      Retina, Degeneration                 |                3                                                         |      2  3.5|
                                           |__________________________________________________________________________|____________|
   Zymbal's Gland                          |                                                                          |   1        |
 _____________________________________________________________________________________________________________________|            |
 URINARY SYSTEM                            |                                                                          |            |
                                           |__________________________________________________________________________|____________|
   Kidney                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Hydronephrosis                       |                                                                          |      1  2.0|
      Infarct                              |                                                       3                  |      1  3.0|
      Inflammation, Chronic                |                                                                          |      3  2.3|
      Nephropathy                          |          1     1           1        1     1     1  1        1     1  1   |     22  1.2|
      Renal Tubule, Dilatation             |                                                                          |      1  2.0|
      Renal Tubule, Necrosis               |                                                                          |      1  2.0|
      Transitional Epithelium, Hyperplasia |                                                       2                  |      2  2.0|
                                           |__________________________________________________________________________|____________|
   Urinary Bladder                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Edema                                | 3                                                                        |      1  3.0|
 _____________________________________________________________________________________________________________________|____________|
                                                                                                                                    
  * : Total animals with tissue examined microscopically; total animals with lesion and mean severity grade                         
  + : Tissue examined microscopically                M : Missing tissue                        1-4 : Lesion qualified as:           
  X : Lesion present but not qualified               A : Autolysis precludes examination               1) Minimal  3) Moderate      
  I : Insufficient tissue                        BLANK : Not examined                                  2) Mild     4) Marked        
                                                                                                                                    
                                                             Page  72                                                               
                                                                                                                                   
NTP Experiment-Test: 93023-06                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09  
Study Type: CHRONIC                                           2,4-HEXADIENAL                                      Date: 03/14/01    
Route: GAVAGE                                                                                                     Time: 15:02:06    
 __________________________________________________________________________________________________________________________________ 
                                           | 6| 7| 7| 7| 7| 6| 7| 7| 1| 7| 7| 5| 7| 6| 7| 7| 7| 7| 7| 3| 7| 5| 7| 7| 7|            |
                             DAY ON TEST   | 6| 3| 3| 3| 3| 6| 3| 3| 9| 3| 1| 8| 2| 3| 2| 2| 2| 2| 2| 4| 3| 0| 3| 3| 3|            |
                                           | 4| 0| 0| 0| 0| 2| 0| 0| 0| 0| 5| 2| 9| 4| 9| 9| 9| 9| 9| 5| 0| 9| 0| 0| 0|            |
 __________________________________________|__________________________________________________________________________|      T (*) |
                                           | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|      O     |
   FISCHER 344 RATS MALE                   | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|      T     |
                               ANIMAL ID   | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 1|      A     |
    22.5                                   | 7| 7| 7| 7| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 0|      L     |
    MG/KG/DY                               | 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0|            |
 _____________________________________________________________________________________________________________________|____________|
 URINARY SYSTEM - cont                     |                                                                          |            |
      Hemorrhage                           |                4                                                         |      2  4.0|
      Inflammation, Chronic                |                               2                                          |      1  2.0|
      Transitional Epithelium, Hyperplasia |                                                                4         |      2  3.0|
 __________________________________________________________________________________________________________________________________ 
                                                                                                                                    
  * : Total animals with tissue examined microscopically; total animals with lesion and mean severity grade                         
  + : Tissue examined microscopically                M : Missing tissue                        1-4 : Lesion qualified as:           
  X : Lesion present but not qualified               A : Autolysis precludes examination               1) Minimal  3) Moderate      
  I : Insufficient tissue                        BLANK : Not examined                                  2) Mild     4) Marked        
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                             Page  73                                                               
                                                                                                                                   
NTP Experiment-Test: 93023-06                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09  
Study Type: CHRONIC                                           2,4-HEXADIENAL                                      Date: 03/14/01    
Route: GAVAGE                                                                                                     Time: 15:02:06    
 _____________________________________________________________________________________________________________________              
                                           | 6| 6| 7| 6| 7| 7| 7| 7| 6| 7| 7| 5| 5| 7| 7| 7| 7| 7| 6| 5| 6| 6| 7| 7| 7|             
                             DAY ON TEST   | 0| 6| 2| 9| 3| 3| 2| 2| 7| 2| 2| 3| 0| 3| 3| 2| 2| 2| 8| 5| 2| 6| 3| 3| 3|             
                                           | 6| 3| 9| 1| 1| 1| 9| 9| 1| 9| 9| 6| 3| 1| 1| 9| 9| 9| 6| 3| 0| 4| 1| 1| 1|             
 __________________________________________|__________________________________________________________________________|             
                                           | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|             
   FISCHER 344 RATS MALE                   | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|             
                               ANIMAL ID   | 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1|             
    45                                     | 0| 0| 0| 0| 0| 0| 0| 0| 0| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 2| 2| 2| 2| 2| 2|             
    MG/KG/DY                               | 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5|             
 __________________________________________|__________________________________________________________________________|             
 ALIMENTARY SYSTEM                         |                                                                          |             
                                           |__________________________________________________________________________|             
   Esophagus                               | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  M  +  +  +  +  +  +  M  +|             
      Perforation                          |                                                                          |             
                                           |__________________________________________________________________________|             
   Intestine Large, Colon                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                           |__________________________________________________________________________|             
   Intestine Large, Rectum                 | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                           |__________________________________________________________________________|             
   Intestine Large, Cecum                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Edema                                |                                                                3         |             
                                           |__________________________________________________________________________|             
   Intestine Small, Duodenum               | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                           |__________________________________________________________________________|             
   Intestine Small, Jejunum                | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                           |__________________________________________________________________________|             
   Intestine Small, Ileum                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                           |__________________________________________________________________________|             
   Liver                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Basophilic Focus                     | X        X  X  X  X              X  X  X  X           X           X  X  X|             
      Clear Cell Focus                     |             X     X  X           X                                      X|             
      Eosinophilic Focus                   |                                                                   X      |             
      Hepatodiaphragmatic Nodule           |                                     X                                    |             
      Infiltration Cellular, Mixed Cell    | 3                                                                        |             
      Mixed Cell Focus                     |                                           X     X  X              X  X   |             
      Bile Duct, Hyperplasia               |    1  1  2  1  1  3  2  2  1  2  1     2  1  3  2  2  2     3     1  2  2|             
      Centrilobular, Necrosis              |                                                          4               |             
      Hepatocyte, Vacuolization Cytoplasmic|                      3                                      3            |             
                                           |__________________________________________________________________________|             
   Mesentery                               |          +              +  +                       +  +  +     +  +  +  +|             
      Accessory Spleen                     |                                                          X               |             
      Fat, Necrosis                        |          2                 3                       3  3        3  3  3  3|             
                                           |__________________________________________________________________________|             
   Oral Mucosa                             |    +                                                                     |             
                                           |__________________________________________________________________________|             
   Pancreas                                | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Atrophy                              |                      3                    1     2                        |             
      Cyst                                 |             3                                                            |             
      Acinus, Cytoplasmic Alteration       | 3        3                                                  3            |             
 __________________________________________|__________________________________________________________________________|             
                                                                                                                                    
                                                                                                                                    
                                                             Page  74                                                               
                                                                                                                                   
NTP Experiment-Test: 93023-06                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09  
Study Type: CHRONIC                                           2,4-HEXADIENAL                                      Date: 03/14/01    
Route: GAVAGE                                                                                                     Time: 15:02:06    
 _____________________________________________________________________________________________________________________              
                                           | 6| 6| 7| 6| 7| 7| 7| 7| 6| 7| 7| 5| 5| 7| 7| 7| 7| 7| 6| 5| 6| 6| 7| 7| 7|             
                             DAY ON TEST   | 0| 6| 2| 9| 3| 3| 2| 2| 7| 2| 2| 3| 0| 3| 3| 2| 2| 2| 8| 5| 2| 6| 3| 3| 3|             
                                           | 6| 3| 9| 1| 1| 1| 9| 9| 1| 9| 9| 6| 3| 1| 1| 9| 9| 9| 6| 3| 0| 4| 1| 1| 1|             
 __________________________________________|__________________________________________________________________________|             
                                           | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|             
   FISCHER 344 RATS MALE                   | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|             
                               ANIMAL ID   | 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1|             
    45                                     | 0| 0| 0| 0| 0| 0| 0| 0| 0| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 2| 2| 2| 2| 2| 2|             
    MG/KG/DY                               | 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5|             
 __________________________________________|__________________________________________________________________________|             
 ALIMENTARY SYSTEM - cont                  |                                                                          |             
      Acinus, Hyperplasia, Focal           |       3  3        2  2     3           3  1     3                       2|             
                                           |__________________________________________________________________________|             
   Salivary Glands                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                           |__________________________________________________________________________|             
   Stomach, Forestomach                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Edema                                |                                                          3     3         |             
      Inflammation, Chronic Active         |                                                                          |             
      Epithelium, Cyst                     |             3                                                            |             
      Epithelium, Hyperplasia              | 1  1  2  1  3  2  2  1     2  3        2  2  2  3  2  1        2  2  1  2|             
                                           |__________________________________________________________________________|             
   Stomach, Glandular                      | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Edema                                |                                                          3               |             
      Ulcer                                |                                                          3               |             
                                           |__________________________________________________________________________|             
   Tongue                                  | +                                                                        |             
      Epithelium, Hyperplasia              |                                                                          |             
 _____________________________________________________________________________________________________________________|             
 CARDIOVASCULAR SYSTEM                     |                                                                          |             
                                           |__________________________________________________________________________|             
   Heart                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Cardiomyopathy                       | 1  2  3  1  1     1  2        1  2  1  3  3  3  1  1     3  2  3     2  2|             
 _____________________________________________________________________________________________________________________|             
 ENDOCRINE SYSTEM                          |                                                                          |             
                                           |__________________________________________________________________________|             
   Adrenal Cortex                          | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Accessory Adrenal Cortical Nodule    |    3  3  3                       3        3                 3  3        3|             
      Angiectasis                          |                                                                          |             
      Degeneration, Fatty                  |       1     2                             3           2  3  2           1|             
      Hyperplasia, Diffuse                 |                                                          2  3            |             
      Hyperplasia, Focal                   |                                           2                       1      |             
      Hypertrophy, Focal                   |                                                       1        4         |             
                                           |__________________________________________________________________________|             
   Adrenal Medulla                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Hyperplasia                          |                                        2     2     2                     |             
                                           |__________________________________________________________________________|             
   Islets, Pancreatic                      | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                           |__________________________________________________________________________|             
   Parathyroid Gland                       | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
 __________________________________________|__________________________________________________________________________|             
                                                                                                                                    
                                                                                                                                    
                                                             Page  75                                                               
                                                                                                                                   
NTP Experiment-Test: 93023-06                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09  
Study Type: CHRONIC                                           2,4-HEXADIENAL                                      Date: 03/14/01    
Route: GAVAGE                                                                                                     Time: 15:02:06    
 _____________________________________________________________________________________________________________________              
                                           | 6| 6| 7| 6| 7| 7| 7| 7| 6| 7| 7| 5| 5| 7| 7| 7| 7| 7| 6| 5| 6| 6| 7| 7| 7|             
                             DAY ON TEST   | 0| 6| 2| 9| 3| 3| 2| 2| 7| 2| 2| 3| 0| 3| 3| 2| 2| 2| 8| 5| 2| 6| 3| 3| 3|             
                                           | 6| 3| 9| 1| 1| 1| 9| 9| 1| 9| 9| 6| 3| 1| 1| 9| 9| 9| 6| 3| 0| 4| 1| 1| 1|             
 __________________________________________|__________________________________________________________________________|             
                                           | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|             
   FISCHER 344 RATS MALE                   | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|             
                               ANIMAL ID   | 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1|             
    45                                     | 0| 0| 0| 0| 0| 0| 0| 0| 0| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 2| 2| 2| 2| 2| 2|             
    MG/KG/DY                               | 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5|             
 __________________________________________|__________________________________________________________________________|             
 ENDOCRINE SYSTEM - cont                   |                                                                          |             
                                           |__________________________________________________________________________|             
   Pituitary Gland                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Pars Distalis, Angiectasis           |                                              3                           |             
      Pars Distalis, Cyst                  |          3                                                               |             
      Pars Distalis, Hyperplasia, Focal    |                   1        2              2  3                       1   |             
      Pars Intermedia, Angiectasis         |                      3                                                   |             
      Pars Intermedia, Cyst                |                                                                          |             
                                           |__________________________________________________________________________|             
   Thyroid Gland                           | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      C-Cell, Hyperplasia                  |    2           1              2              2        3  1     1  1  2   |             
      Follicle, Cyst                       |                                                                      3   |             
      Follicular Cell, Hyperplasia         |                                                             3            |             
 _____________________________________________________________________________________________________________________|             
 GENERAL BODY SYSTEM                       |                                                                          |             
                                           |__________________________________________________________________________|             
   Peritoneum                              |                                                                          |             
 _____________________________________________________________________________________________________________________|             
 GENITAL SYSTEM                            |                                                                          |             
                                           |__________________________________________________________________________|             
   Epididymis                              | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Atypia Cellular                      |    2  3     2  3  2  3  2              2  3        2     3        2  3  3|             
                                           |__________________________________________________________________________|             
   Preputial Gland                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Cyst                                 |                            3                                             |             
      Inflammation, Chronic                | 3  2  2  3  3  2  2        2  3     3  3  2  2  3  2              3     2|             
                                           |__________________________________________________________________________|             
   Prostate                                | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Inflammation, Chronic                |       2  2        2  2        2              2     2  3  3  2            |             
      Epithelium, Ventral, Hyperplasia     |       1              2     1           1  1        4                     |             
                                           |__________________________________________________________________________|             
   Seminal Vesicle                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                           |__________________________________________________________________________|             
   Testes                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Germinal Epithelium, Atrophy         |       3              3  3  3  1              4        1                 4|             
      Interstitial Cell, Hyperplasia       |          1              2  2     1           2                           |             
 _____________________________________________________________________________________________________________________|             
 HEMATOPOIETIC SYSTEM                      |                                                                          |             
                                           |__________________________________________________________________________|             
 __________________________________________|__________________________________________________________________________|             
                                                                                                                                    
                                                                                                                                    
                                                             Page  76                                                               
                                                                                                                                   
NTP Experiment-Test: 93023-06                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09  
Study Type: CHRONIC                                           2,4-HEXADIENAL                                      Date: 03/14/01    
Route: GAVAGE                                                                                                     Time: 15:02:06    
 _____________________________________________________________________________________________________________________              
                                           | 6| 6| 7| 6| 7| 7| 7| 7| 6| 7| 7| 5| 5| 7| 7| 7| 7| 7| 6| 5| 6| 6| 7| 7| 7|             
                             DAY ON TEST   | 0| 6| 2| 9| 3| 3| 2| 2| 7| 2| 2| 3| 0| 3| 3| 2| 2| 2| 8| 5| 2| 6| 3| 3| 3|             
                                           | 6| 3| 9| 1| 1| 1| 9| 9| 1| 9| 9| 6| 3| 1| 1| 9| 9| 9| 6| 3| 0| 4| 1| 1| 1|             
 __________________________________________|__________________________________________________________________________|             
                                           | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|             
   FISCHER 344 RATS MALE                   | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|             
                               ANIMAL ID   | 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1|             
    45                                     | 0| 0| 0| 0| 0| 0| 0| 0| 0| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 2| 2| 2| 2| 2| 2|             
    MG/KG/DY                               | 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5|             
 __________________________________________|__________________________________________________________________________|             
 HEMATOPOIETIC SYSTEM - cont               |                                                                          |             
   Bone Marrow                             | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Hyperplasia                          |                3                 4  3  3                 2               |             
                                           |__________________________________________________________________________|             
   Lymph Node                              |    +  +  +  +  +     +        +        +  +  +     +  +  +     +  +  +   |             
      Mediastinal, Hemorrhage              |          3                    2                    1  3                  |             
      Mediastinal, Hyperplasia, Lymphoid   |                               2        3           3                     |             
      Mediastinal, Pigmentation            |                                              2     2  2                  |             
      Pancreatic, Ectasia                  |       3                                                                  |             
      Pancreatic, Hemorrhage               |    1     2                    1                    2                 1   |             
      Pancreatic, Hyperplasia, Lymphoid    |    2     2  2        2        1        2  2           2           2  2   |             
      Pancreatic, Pigmentation             |    2  1  3  2        2        3        2  2        1  2        2  1  1   |             
                                           |__________________________________________________________________________|             
   Lymph Node, Mandibular                  | +  M  M  M  M  M  M  M  M  +  M  M  M  M  M  M  M  M  M  M  M  M  M  +  M|             
      Ectasia                              | 4                                                                        |             
                                           |__________________________________________________________________________|             
   Lymph Node, Mesenteric                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Hemorrhage                           | 1                                                        3               |             
      Hyperplasia, Lymphoid                |             2  2  3           2     2           2        2  2     2      |             
      Pigmentation                         | 2        2  2     3  2     2        2           2  2  2           2  2  2|             
                                           |__________________________________________________________________________|             
   Spleen                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Fibrosis                             |                                                       2                  |             
      Hematopoietic Cell Proliferation     |       1     1     1        2  1  3  3  1        1  2     4  2        1   |             
      Pigmentation                         |       2  3        2        2  2           2           3     2            |             
      Lymphoid Follicle, Hyperplasia       |                                        3                                 |             
                                           |__________________________________________________________________________|             
   Thymus                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
 _____________________________________________________________________________________________________________________|             
 INTEGUMENTARY SYSTEM                      |                                                                          |             
                                           |__________________________________________________________________________|             
   Mammary Gland                           | +  +  +  +  +  +  +  +  +  +  +  M  +  +  +  M  +  +  +  +  M  +  M  +  +|             
      Cyst                                 |                                                          3               |             
      Hyperplasia                          |       3  3           2        4                    2  4              2   |             
                                           |__________________________________________________________________________|             
   Skin                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Cyst Epithelial Inclusion            |                                                                          |             
      Granuloma                            |                                                                3         |             
 __________________________________________|__________________________________________________________________________|             
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                             Page  77                                                               
                                                                                                                                   
NTP Experiment-Test: 93023-06                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09  
Study Type: CHRONIC                                           2,4-HEXADIENAL                                      Date: 03/14/01    
Route: GAVAGE                                                                                                     Time: 15:02:06    
 _____________________________________________________________________________________________________________________              
                                           | 6| 6| 7| 6| 7| 7| 7| 7| 6| 7| 7| 5| 5| 7| 7| 7| 7| 7| 6| 5| 6| 6| 7| 7| 7|             
                             DAY ON TEST   | 0| 6| 2| 9| 3| 3| 2| 2| 7| 2| 2| 3| 0| 3| 3| 2| 2| 2| 8| 5| 2| 6| 3| 3| 3|             
                                           | 6| 3| 9| 1| 1| 1| 9| 9| 1| 9| 9| 6| 3| 1| 1| 9| 9| 9| 6| 3| 0| 4| 1| 1| 1|             
 __________________________________________|__________________________________________________________________________|             
                                           | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|             
   FISCHER 344 RATS MALE                   | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|             
                               ANIMAL ID   | 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1|             
    45                                     | 0| 0| 0| 0| 0| 0| 0| 0| 0| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 2| 2| 2| 2| 2| 2|             
    MG/KG/DY                               | 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5|             
 __________________________________________|__________________________________________________________________________|             
 MUSCULOSKELETAL SYSTEM                    |                                                                          |             
                                           |__________________________________________________________________________|             
   Bone                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                           |__________________________________________________________________________|             
   Skeletal Muscle                         |                                                       +                  |             
 _____________________________________________________________________________________________________________________|             
 NERVOUS SYSTEM                            |                                                                          |             
                                           |__________________________________________________________________________|             
   Brain                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Compression                          |          3                                         2  3     4            |             
      Hemorrhage                           |                                                                          |             
      Hydrocephalus                        |                                                             2            |             
      Necrosis                             |                                                          2               |             
                                           |__________________________________________________________________________|             
   Peripheral Nerve                        |                                                       +                  |             
                                           |__________________________________________________________________________|             
   Spinal Cord                             |                                                       +                  |             
 _____________________________________________________________________________________________________________________|             
 RESPIRATORY SYSTEM                        |                                                                          |             
                                           |__________________________________________________________________________|             
   Lung                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Congestion                           |    3                                                                     |             
      Edema                                |    3                                                                     |             
      Hemorrhage                           |                                                          3               |             
      Infiltration Cellular, Histiocyte    | 1     1  1        1           1  1              1  1        1  1         |             
      Metaplasia, Osseous                  |       2                    1                                             |             
      Alveolar Epithelium, Hyperplasia,    |                                                                          |             
           Focal                           |                                                                   3      |             
      Alveolar Epithelium, Hyperplasia     |                                                                      3   |             
                                           |__________________________________________________________________________|             
   Nose                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Foreign Body                         |                                                          X              X|             
      Inflammation, Chronic                | 2     1                                                  2              3|             
      Respiratory Epithelium, Hyperplasia  | 2     1                                                                 2|             
      Respiratory Epithelium, Metaplasia,  |                                                                          |             
           Squamous                        |       1                                                                  |             
                                           |__________________________________________________________________________|             
   Trachea                                 | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
 __________________________________________|__________________________________________________________________________|             
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                             Page  78                                                               
                                                                                                                                   
NTP Experiment-Test: 93023-06                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09  
Study Type: CHRONIC                                           2,4-HEXADIENAL                                      Date: 03/14/01    
Route: GAVAGE                                                                                                     Time: 15:02:06    
 _____________________________________________________________________________________________________________________              
                                           | 6| 6| 7| 6| 7| 7| 7| 7| 6| 7| 7| 5| 5| 7| 7| 7| 7| 7| 6| 5| 6| 6| 7| 7| 7|             
                             DAY ON TEST   | 0| 6| 2| 9| 3| 3| 2| 2| 7| 2| 2| 3| 0| 3| 3| 2| 2| 2| 8| 5| 2| 6| 3| 3| 3|             
                                           | 6| 3| 9| 1| 1| 1| 9| 9| 1| 9| 9| 6| 3| 1| 1| 9| 9| 9| 6| 3| 0| 4| 1| 1| 1|             
 __________________________________________|__________________________________________________________________________|             
                                           | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|             
   FISCHER 344 RATS MALE                   | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|             
                               ANIMAL ID   | 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1|             
    45                                     | 0| 0| 0| 0| 0| 0| 0| 0| 0| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 2| 2| 2| 2| 2| 2|             
    MG/KG/DY                               | 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5|             
 __________________________________________|__________________________________________________________________________|             
 SPECIAL SENSES SYSTEM                     |                                                                          |             
                                           |__________________________________________________________________________|             
   Harderian Gland                         |                                                             +            |             
      Pigmentation                         |                                                             3            |             
 _____________________________________________________________________________________________________________________|             
 URINARY SYSTEM                            |                                                                          |             
                                           |__________________________________________________________________________|             
   Kidney                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Cyst                                 |                         3                                                |             
      Inflammation, Chronic                |                                                                         2|             
      Nephropathy                          |             1  1  1     1  1           1  2  1           3  2  4        1|             
      Renal Tubule, Dilatation             |                                                                          |             
      Renal Tubule, Pigmentation           |                                                                          |             
                                           |__________________________________________________________________________|             
   Urinary Bladder                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
 __________________________________________|__________________________________________________________________________              
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                             Page  79                                                               
                                                                                                                                   
NTP Experiment-Test: 93023-06                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09  
Study Type: CHRONIC                                           2,4-HEXADIENAL                                      Date: 03/14/01    
Route: GAVAGE                                                                                                     Time: 15:02:06    
 __________________________________________________________________________________________________________________________________ 
                                           | 7| 6| 7| 7| 7| 7| 5| 7| 3| 7| 6| 7| 4| 7| 7| 7| 7| 7| 7| 7| 7| 7| 6| 7| 7|            |
                             DAY ON TEST   | 3| 2| 3| 3| 3| 3| 6| 3| 6| 3| 2| 2| 8| 2| 3| 1| 3| 2| 2| 2| 3| 3| 2| 3| 3|            |
                                           | 1| 9| 1| 1| 1| 1| 0| 1| 4| 1| 0| 9| 3| 9| 0| 3| 0| 9| 9| 9| 1| 1| 4| 0| 0|            |
 __________________________________________|__________________________________________________________________________|      T (*) |
                                           | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|      O     |
   FISCHER 344 RATS MALE                   | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|      T     |
                               ANIMAL ID   | 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1|      A     |
    45                                     | 2| 2| 2| 2| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 5|      L     |
    MG/KG/DY                               | 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0|            |
 _____________________________________________________________________________________________________________________|____________|
 ALIMENTARY SYSTEM                         |                                                                          |            |
                                           |__________________________________________________________________________|____________|
   Esophagus                               | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  48        |
      Perforation                          |                         X                                                |      1     |
                                           |__________________________________________________________________________|____________|
   Intestine Large, Colon                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
                                           |__________________________________________________________________________|____________|
   Intestine Large, Rectum                 | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
                                           |__________________________________________________________________________|____________|
   Intestine Large, Cecum                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Edema                                |                                                                          |      1  3.0|
                                           |__________________________________________________________________________|____________|
   Intestine Small, Duodenum               | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
                                           |__________________________________________________________________________|____________|
   Intestine Small, Jejunum                | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
                                           |__________________________________________________________________________|____________|
   Intestine Small, Ileum                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
                                           |__________________________________________________________________________|____________|
   Liver                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Basophilic Focus                     |    X  X  X  X  X     X     X     X     X  X     X  X  X  X  X  X     X  X|     31     |
      Clear Cell Focus                     |                            X                                   X        X|      8     |
      Eosinophilic Focus                   | X     X  X     X                 X        X     X     X  X               |     10     |
      Hepatodiaphragmatic Nodule           |                                           X                             X|      3     |
      Infiltration Cellular, Mixed Cell    |                                                                          |      1  3.0|
      Mixed Cell Focus                     |          X                                         X  X     X           X|     10     |
      Bile Duct, Hyperplasia               | 1        2  2        1     3  1        1  2  2  1  2  2  1  2  3  2  1  1|     39  1.7|
      Centrilobular, Necrosis              |                                                                          |      1  4.0|
      Hepatocyte, Vacuolization Cytoplasmic|                   3     3                 3                       3      |      6  3.0|
                                           |__________________________________________________________________________|____________|
   Mesentery                               |       +  +        +  +           +  +           +        +           +   |  19        |
      Accessory Spleen                     |                                                                          |      1     |
      Fat, Necrosis                        |       3  3        2  3           3  3           3        3           3   |     17  2.9|
                                           |__________________________________________________________________________|____________|
   Oral Mucosa                             |                                                                          |   1        |
                                           |__________________________________________________________________________|____________|
 _____________________________________________________________________________________________________________________|____________|
                                                                                                                                    
  * : Total animals with tissue examined microscopically; total animals with lesion and mean severity grade                         
  + : Tissue examined microscopically                M : Missing tissue                        1-4 : Lesion qualified as:           
  X : Lesion present but not qualified               A : Autolysis precludes examination               1) Minimal  3) Moderate      
  I : Insufficient tissue                        BLANK : Not examined                                  2) Mild     4) Marked        
                                                                                                                                    
                                                             Page  80                                                               
                                                                                                                                   
NTP Experiment-Test: 93023-06                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09  
Study Type: CHRONIC                                           2,4-HEXADIENAL                                      Date: 03/14/01    
Route: GAVAGE                                                                                                     Time: 15:02:06    
 __________________________________________________________________________________________________________________________________ 
                                           | 7| 6| 7| 7| 7| 7| 5| 7| 3| 7| 6| 7| 4| 7| 7| 7| 7| 7| 7| 7| 7| 7| 6| 7| 7|            |
                             DAY ON TEST   | 3| 2| 3| 3| 3| 3| 6| 3| 6| 3| 2| 2| 8| 2| 3| 1| 3| 2| 2| 2| 3| 3| 2| 3| 3|            |
                                           | 1| 9| 1| 1| 1| 1| 0| 1| 4| 1| 0| 9| 3| 9| 0| 3| 0| 9| 9| 9| 1| 1| 4| 0| 0|            |
 __________________________________________|__________________________________________________________________________|      T (*) |
                                           | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|      O     |
   FISCHER 344 RATS MALE                   | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|      T     |
                               ANIMAL ID   | 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1|      A     |
    45                                     | 2| 2| 2| 2| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 5|      L     |
    MG/KG/DY                               | 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0|            |
 _____________________________________________________________________________________________________________________|____________|
 ALIMENTARY SYSTEM - cont                  |                                                                          |            |
   Pancreas                                | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Atrophy                              |       1                                   3           1        2         |      7  1.9|
      Cyst                                 |                      3                                                   |      2  3.0|
      Acinus, Cytoplasmic Alteration       |                                                                          |      3  3.0|
      Acinus, Hyperplasia, Focal           | 3        2     3           2     2     3        3              2     3   |     18  2.5|
                                           |__________________________________________________________________________|____________|
   Salivary Glands                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
                                           |__________________________________________________________________________|____________|
   Stomach, Forestomach                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Edema                                |                                                                          |      2  3.0|
      Inflammation, Chronic Active         |                                                             2            |      1  2.0|
      Epithelium, Cyst                     |                                                                          |      1  3.0|
      Epithelium, Hyperplasia              | 1  1  2  2  1  1  2  2     2     2     3  2  1  2  2  2  2  3  1  3  2  2|     42  1.9|
                                           |__________________________________________________________________________|____________|
   Stomach, Glandular                      | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Edema                                |                                                                          |      1  3.0|
      Ulcer                                |                                                                          |      1  3.0|
                                           |__________________________________________________________________________|____________|
   Tongue                                  |          +                                                               |   2        |
      Epithelium, Hyperplasia              |          3                                                               |      1  3.0|
 _____________________________________________________________________________________________________________________|            |
 CARDIOVASCULAR SYSTEM                     |                                                                          |            |
                                           |__________________________________________________________________________|____________|
   Heart                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Cardiomyopathy                       | 1  1  1  1  3  3  2  2  2  2     3     2  3  2  3  3  2  2  3  3  2  2   |     42  2.0|
 _____________________________________________________________________________________________________________________|            |
 ENDOCRINE SYSTEM                          |                                                                          |            |
                                           |__________________________________________________________________________|____________|
   Adrenal Cortex                          | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Accessory Adrenal Cortical Nodule    |          3  3        3                 3  3  3  3              3     3   |     17  3.0|
      Angiectasis                          |                                                                         3|      1  3.0|
      Degeneration, Fatty                  |          3                                1              2               |     10  2.0|
      Hyperplasia, Diffuse                 |                                                                          |      2  2.5|
      Hyperplasia, Focal                   |                1                       1           2                    1|      6  1.3|
 _____________________________________________________________________________________________________________________|____________|
                                                                                                                                    
  * : Total animals with tissue examined microscopically; total animals with lesion and mean severity grade                         
  + : Tissue examined microscopically                M : Missing tissue                        1-4 : Lesion qualified as:           
  X : Lesion present but not qualified               A : Autolysis precludes examination               1) Minimal  3) Moderate      
  I : Insufficient tissue                        BLANK : Not examined                                  2) Mild     4) Marked        
                                                                                                                                    
                                                             Page  81                                                               
                                                                                                                                   
NTP Experiment-Test: 93023-06                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09  
Study Type: CHRONIC                                           2,4-HEXADIENAL                                      Date: 03/14/01    
Route: GAVAGE                                                                                                     Time: 15:02:06    
 __________________________________________________________________________________________________________________________________ 
                                           | 7| 6| 7| 7| 7| 7| 5| 7| 3| 7| 6| 7| 4| 7| 7| 7| 7| 7| 7| 7| 7| 7| 6| 7| 7|            |
                             DAY ON TEST   | 3| 2| 3| 3| 3| 3| 6| 3| 6| 3| 2| 2| 8| 2| 3| 1| 3| 2| 2| 2| 3| 3| 2| 3| 3|            |
                                           | 1| 9| 1| 1| 1| 1| 0| 1| 4| 1| 0| 9| 3| 9| 0| 3| 0| 9| 9| 9| 1| 1| 4| 0| 0|            |
 __________________________________________|__________________________________________________________________________|      T (*) |
                                           | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|      O     |
   FISCHER 344 RATS MALE                   | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|      T     |
                               ANIMAL ID   | 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1|      A     |
    45                                     | 2| 2| 2| 2| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 5|      L     |
    MG/KG/DY                               | 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0|            |
 _____________________________________________________________________________________________________________________|____________|
 ENDOCRINE SYSTEM - cont                   |                                                                          |            |
      Hypertrophy, Focal                   |    1     3                                1                              |      5  2.0|
                                           |__________________________________________________________________________|____________|
   Adrenal Medulla                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Hyperplasia                          |                      2                                1     1            |      6  1.7|
                                           |__________________________________________________________________________|____________|
   Islets, Pancreatic                      | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
                                           |__________________________________________________________________________|____________|
   Parathyroid Gland                       | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  M  +  +  +  +  +  +  +  +  +|  49        |
                                           |__________________________________________________________________________|____________|
   Pituitary Gland                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Pars Distalis, Angiectasis           |                                                                          |      1  3.0|
      Pars Distalis, Cyst                  |    3     3                 3           3           3                     |      6  3.0|
      Pars Distalis, Hyperplasia, Focal    |       1  2                       3                                3      |      9  2.0|
      Pars Intermedia, Angiectasis         |          2                                                               |      2  2.5|
      Pars Intermedia, Cyst                | 3                                                                        |      1  3.0|
                                           |__________________________________________________________________________|____________|
   Thyroid Gland                           | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      C-Cell, Hyperplasia                  |             2  2                 2              2  2  3     1     1  3   |     18  1.8|
      Follicle, Cyst                       |                                                    3                     |      2  3.0|
      Follicular Cell, Hyperplasia         |                                                                          |      1  3.0|
 _____________________________________________________________________________________________________________________|            |
 GENERAL BODY SYSTEM                       |                                                                          |            |
                                           |__________________________________________________________________________|____________|
   Peritoneum                              |                                                                   +      |   1        |
 _____________________________________________________________________________________________________________________|            |
 GENITAL SYSTEM                            |                                                                          |            |
                                           |__________________________________________________________________________|____________|
   Epididymis                              | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Atypia Cellular                      | 3  3  3  3                    3        2  2     3     4     3  3  2  3  2|     28  2.6|
                                           |__________________________________________________________________________|____________|
   Preputial Gland                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Cyst                                 |                                                                          |      1  3.0|
      Inflammation, Chronic                | 3  2        2     2  2           2  2     2  2  3     2     2  2  3      |     31  2.4|
                                           |__________________________________________________________________________|____________|
 _____________________________________________________________________________________________________________________|____________|
                                                                                                                                    
  * : Total animals with tissue examined microscopically; total animals with lesion and mean severity grade                         
  + : Tissue examined microscopically                M : Missing tissue                        1-4 : Lesion qualified as:           
  X : Lesion present but not qualified               A : Autolysis precludes examination               1) Minimal  3) Moderate      
  I : Insufficient tissue                        BLANK : Not examined                                  2) Mild     4) Marked        
                                                                                                                                    
                                                             Page  82                                                               
                                                                                                                                   
NTP Experiment-Test: 93023-06                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09  
Study Type: CHRONIC                                           2,4-HEXADIENAL                                      Date: 03/14/01    
Route: GAVAGE                                                                                                     Time: 15:02:06    
 __________________________________________________________________________________________________________________________________ 
                                           | 7| 6| 7| 7| 7| 7| 5| 7| 3| 7| 6| 7| 4| 7| 7| 7| 7| 7| 7| 7| 7| 7| 6| 7| 7|            |
                             DAY ON TEST   | 3| 2| 3| 3| 3| 3| 6| 3| 6| 3| 2| 2| 8| 2| 3| 1| 3| 2| 2| 2| 3| 3| 2| 3| 3|            |
                                           | 1| 9| 1| 1| 1| 1| 0| 1| 4| 1| 0| 9| 3| 9| 0| 3| 0| 9| 9| 9| 1| 1| 4| 0| 0|            |
 __________________________________________|__________________________________________________________________________|      T (*) |
                                           | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|      O     |
   FISCHER 344 RATS MALE                   | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|      T     |
                               ANIMAL ID   | 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1|      A     |
    45                                     | 2| 2| 2| 2| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 5|      L     |
    MG/KG/DY                               | 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0|            |
 _____________________________________________________________________________________________________________________|____________|
 GENITAL SYSTEM - cont                     |                                                                          |            |
   Prostate                                | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Inflammation, Chronic                |             2     3  3                       3     3     3              3|     17  2.5|
      Epithelium, Ventral, Hyperplasia     |       2                    3                          2        1     1   |     11  1.7|
                                           |__________________________________________________________________________|____________|
   Seminal Vesicle                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
                                           |__________________________________________________________________________|____________|
   Testes                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Germinal Epithelium, Atrophy         |                                        2  3              4               |     11  2.8|
      Interstitial Cell, Hyperplasia       |                                     2              1                     |      7  1.6|
 _____________________________________________________________________________________________________________________|            |
 HEMATOPOIETIC SYSTEM                      |                                                                          |            |
                                           |__________________________________________________________________________|____________|
   Bone Marrow                             | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Hyperplasia                          |                            2                                             |      6  2.8|
                                           |__________________________________________________________________________|____________|
   Lymph Node                              | +  +  +  +  +  +              +     +  +        +     +     +        +   |  29        |
      Mediastinal, Hemorrhage              |                                                                          |      4  2.3|
      Mediastinal, Hyperplasia, Lymphoid   |          2                                                               |      4  2.5|
      Mediastinal, Pigmentation            |          2                                            2                  |      5  2.0|
      Pancreatic, Ectasia                  |                                                                          |      1  3.0|
      Pancreatic, Hemorrhage               |          2  1  1                       1        1           3            |     11  1.5|
      Pancreatic, Hyperplasia, Lymphoid    |       3  2  2                 2        1                                 |     15  1.9|
      Pancreatic, Pigmentation             |    1  1  2  3  2              2        2        2           1            |     22  1.8|
                                           |__________________________________________________________________________|____________|
   Lymph Node, Mandibular                  | M  M  M  M  M  M  M  M  M  M  M  M  M  M  M  M  M  M  M  M  M  M  M  M  M|   3        |
      Ectasia                              |                                                                          |      1  4.0|
                                           |__________________________________________________________________________|____________|
   Lymph Node, Mesenteric                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Hemorrhage                           | 2                                                  1  1                  |      5  1.6|
      Hyperplasia, Lymphoid                | 2     2  2  2  2     2  2     3  2        2           2     2           2|     22  2.1|
      Pigmentation                         | 2  2  2  2  2  2     2     2     2        2     2  2  3     2  2  2  2  2|     31  2.1|
                                           |__________________________________________________________________________|____________|
   Spleen                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Fibrosis                             |                                                                          |      1  2.0|
 _____________________________________________________________________________________________________________________|____________|
                                                                                                                                    
  * : Total animals with tissue examined microscopically; total animals with lesion and mean severity grade                         
  + : Tissue examined microscopically                M : Missing tissue                        1-4 : Lesion qualified as:           
  X : Lesion present but not qualified               A : Autolysis precludes examination               1) Minimal  3) Moderate      
  I : Insufficient tissue                        BLANK : Not examined                                  2) Mild     4) Marked        
                                                                                                                                    
                                                             Page  83                                                               
                                                                                                                                   
NTP Experiment-Test: 93023-06                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09  
Study Type: CHRONIC                                           2,4-HEXADIENAL                                      Date: 03/14/01    
Route: GAVAGE                                                                                                     Time: 15:02:06    
 __________________________________________________________________________________________________________________________________ 
                                           | 7| 6| 7| 7| 7| 7| 5| 7| 3| 7| 6| 7| 4| 7| 7| 7| 7| 7| 7| 7| 7| 7| 6| 7| 7|            |
                             DAY ON TEST   | 3| 2| 3| 3| 3| 3| 6| 3| 6| 3| 2| 2| 8| 2| 3| 1| 3| 2| 2| 2| 3| 3| 2| 3| 3|            |
                                           | 1| 9| 1| 1| 1| 1| 0| 1| 4| 1| 0| 9| 3| 9| 0| 3| 0| 9| 9| 9| 1| 1| 4| 0| 0|            |
 __________________________________________|__________________________________________________________________________|      T (*) |
                                           | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|      O     |
   FISCHER 344 RATS MALE                   | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|      T     |
                               ANIMAL ID   | 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1|      A     |
    45                                     | 2| 2| 2| 2| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 5|      L     |
    MG/KG/DY                               | 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0|            |
 _____________________________________________________________________________________________________________________|____________|
 HEMATOPOIETIC SYSTEM - cont               |                                                                          |            |
      Hematopoietic Cell Proliferation     | 1        2     1     2     1     2     1                             2  1|     22  1.6|
      Pigmentation                         | 2        2  2  3  4  2  3  2           2           2                     |     18  2.3|
      Lymphoid Follicle, Hyperplasia       |                                                                          |      1  3.0|
                                           |__________________________________________________________________________|____________|
   Thymus                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
 _____________________________________________________________________________________________________________________|            |
 INTEGUMENTARY SYSTEM                      |                                                                          |            |
                                           |__________________________________________________________________________|____________|
   Mammary Gland                           | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  46        |
      Cyst                                 |                                                                          |      1  3.0|
      Hyperplasia                          |                2  4                    2     2     3                 2  1|     14  2.6|
                                           |__________________________________________________________________________|____________|
   Skin                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Cyst Epithelial Inclusion            |          X                                                     X         |      2     |
      Granuloma                            |                                                                          |      1  3.0|
 _____________________________________________________________________________________________________________________|            |
 MUSCULOSKELETAL SYSTEM                    |                                                                          |            |
                                           |__________________________________________________________________________|____________|
   Bone                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
                                           |__________________________________________________________________________|____________|
   Skeletal Muscle                         |                                                                          |   1        |
 _____________________________________________________________________________________________________________________|            |
 NERVOUS SYSTEM                            |                                                                          |            |
                                           |__________________________________________________________________________|____________|
   Brain                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Compression                          |                   3                          3                           |      6  3.0|
      Hemorrhage                           |    3                                                                     |      1  3.0|
      Hydrocephalus                        |                                                                          |      1  2.0|
      Necrosis                             |                                                                          |      1  2.0|
                                           |__________________________________________________________________________|____________|
   Peripheral Nerve                        |                                                                          |   1        |
                                           |__________________________________________________________________________|____________|
   Spinal Cord                             |                                                                          |   1        |
 _____________________________________________________________________________________________________________________|            |
                                                                                                                                    
  * : Total animals with tissue examined microscopically; total animals with lesion and mean severity grade                         
  + : Tissue examined microscopically                M : Missing tissue                        1-4 : Lesion qualified as:           
  X : Lesion present but not qualified               A : Autolysis precludes examination               1) Minimal  3) Moderate      
  I : Insufficient tissue                        BLANK : Not examined                                  2) Mild     4) Marked        
                                                                                                                                    
                                                                                                                                    
                                                             Page  84                                                               
                                                                                                                                   
NTP Experiment-Test: 93023-06                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09  
Study Type: CHRONIC                                           2,4-HEXADIENAL                                      Date: 03/14/01    
Route: GAVAGE                                                                                                     Time: 15:02:06    
 __________________________________________________________________________________________________________________________________ 
                                           | 7| 6| 7| 7| 7| 7| 5| 7| 3| 7| 6| 7| 4| 7| 7| 7| 7| 7| 7| 7| 7| 7| 6| 7| 7|            |
                             DAY ON TEST   | 3| 2| 3| 3| 3| 3| 6| 3| 6| 3| 2| 2| 8| 2| 3| 1| 3| 2| 2| 2| 3| 3| 2| 3| 3|            |
                                           | 1| 9| 1| 1| 1| 1| 0| 1| 4| 1| 0| 9| 3| 9| 0| 3| 0| 9| 9| 9| 1| 1| 4| 0| 0|            |
 __________________________________________|__________________________________________________________________________|      T (*) |
                                           | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|      O     |
   FISCHER 344 RATS MALE                   | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|      T     |
                               ANIMAL ID   | 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1|      A     |
    45                                     | 2| 2| 2| 2| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 5|      L     |
    MG/KG/DY                               | 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0|            |
 _____________________________________________________________________________________________________________________|____________|
 RESPIRATORY SYSTEM                        |                                                                          |            |
                                           |__________________________________________________________________________|____________|
   Lung                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Congestion                           |                         3                                                |      2  3.0|
      Edema                                |                                                                          |      1  3.0|
      Hemorrhage                           |                                                                          |      1  3.0|
      Infiltration Cellular, Histiocyte    | 2     1        1           1     1     1  1                          1  1|     19  1.1|
      Metaplasia, Osseous                  |                                                                          |      2  1.5|
      Alveolar Epithelium, Hyperplasia,    |                                                                          |            |
           Focal                           |                                                                          |      1  3.0|
      Alveolar Epithelium, Hyperplasia     |             3  3                                               3  2      |      5  2.8|
                                           |__________________________________________________________________________|____________|
   Nose                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Foreign Body                         |                            X              X        X                     |      5     |
      Inflammation, Chronic                | 3                       2  2        1     1  2     3                    1|     12  1.9|
      Respiratory Epithelium, Hyperplasia  | 2                          2              2        3                     |      7  2.0|
      Respiratory Epithelium, Metaplasia,  |                                                                          |            |
           Squamous                        |                                                    2                     |      2  1.5|
                                           |__________________________________________________________________________|____________|
   Trachea                                 | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
 _____________________________________________________________________________________________________________________|            |
 SPECIAL SENSES SYSTEM                     |                                                                          |            |
                                           |__________________________________________________________________________|____________|
   Harderian Gland                         |                                                                          |   1        |
      Pigmentation                         |                                                                          |      1  3.0|
 _____________________________________________________________________________________________________________________|            |
 URINARY SYSTEM                            |                                                                          |            |
                                           |__________________________________________________________________________|____________|
   Kidney                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Cyst                                 |                                                                          |      1  3.0|
      Inflammation, Chronic                |                                                    1                     |      2  1.5|
      Nephropathy                          | 1              2  1                                   1  1        1     1|     19  1.4|
      Renal Tubule, Dilatation             |    2                                                              2      |      2  2.0|
      Renal Tubule, Pigmentation           |                                                                   1      |      1  1.0|
                                           |__________________________________________________________________________|____________|
 _____________________________________________________________________________________________________________________|____________|
                                                                                                                                    
  * : Total animals with tissue examined microscopically; total animals with lesion and mean severity grade                         
  + : Tissue examined microscopically                M : Missing tissue                        1-4 : Lesion qualified as:           
  X : Lesion present but not qualified               A : Autolysis precludes examination               1) Minimal  3) Moderate      
  I : Insufficient tissue                        BLANK : Not examined                                  2) Mild     4) Marked        
                                                                                                                                    
                                                             Page  85                                                               
                                                                                                                                   
NTP Experiment-Test: 93023-06                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09  
Study Type: CHRONIC                                           2,4-HEXADIENAL                                      Date: 03/14/01    
Route: GAVAGE                                                                                                     Time: 15:02:06    
 __________________________________________________________________________________________________________________________________ 
                                           | 7| 6| 7| 7| 7| 7| 5| 7| 3| 7| 6| 7| 4| 7| 7| 7| 7| 7| 7| 7| 7| 7| 6| 7| 7|            |
                             DAY ON TEST   | 3| 2| 3| 3| 3| 3| 6| 3| 6| 3| 2| 2| 8| 2| 3| 1| 3| 2| 2| 2| 3| 3| 2| 3| 3|            |
                                           | 1| 9| 1| 1| 1| 1| 0| 1| 4| 1| 0| 9| 3| 9| 0| 3| 0| 9| 9| 9| 1| 1| 4| 0| 0|            |
 __________________________________________|__________________________________________________________________________|      T (*) |
                                           | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|      O     |
   FISCHER 344 RATS MALE                   | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|      T     |
                               ANIMAL ID   | 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1|      A     |
    45                                     | 2| 2| 2| 2| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 5|      L     |
    MG/KG/DY                               | 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0|            |
 _____________________________________________________________________________________________________________________|____________|
 URINARY SYSTEM - cont                     |                                                                          |            |
   Urinary Bladder                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
 __________________________________________________________________________________________________________________________________ 
                                                                                                                                    
  * : Total animals with tissue examined microscopically; total animals with lesion and mean severity grade                         
  + : Tissue examined microscopically                M : Missing tissue                        1-4 : Lesion qualified as:           
  X : Lesion present but not qualified               A : Autolysis precludes examination               1) Minimal  3) Moderate      
  I : Insufficient tissue                        BLANK : Not examined                                  2) Mild     4) Marked        
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                             Page  86                                                               
                                                                                                                                   
NTP Experiment-Test: 93023-06                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09  
Study Type: CHRONIC                                           2,4-HEXADIENAL                                      Date: 03/14/01    
Route: GAVAGE                                                                                                     Time: 15:02:06    
 _____________________________________________________________________________________________________________________              
                                           | 7| 5| 7| 7| 7| 7| 3| 7| 6| 7| 6| 5| 7| 6| 6| 7| 7| 5| 7| 7| 7| 7| 7| 3| 7|             
                             DAY ON TEST   | 3| 6| 3| 3| 3| 3| 6| 2| 5| 3| 9| 7| 0| 3| 9| 2| 2| 7| 3| 3| 3| 3| 3| 5| 2|             
                                           | 0| 6| 0| 1| 1| 1| 4| 9| 5| 2| 7| 4| 9| 6| 1| 9| 9| 5| 0| 0| 0| 0| 0| 0| 9|             
 __________________________________________|__________________________________________________________________________|             
                                           | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|             
   FISCHER 344 RATS MALE                   | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|             
                               ANIMAL ID   | 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1|             
    90                                     | 5| 5| 5| 5| 5| 5| 5| 5| 5| 6| 6| 6| 6| 6| 6| 6| 6| 6| 6| 7| 7| 7| 7| 7| 7|             
    MG/KG/DY                               | 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5|             
 __________________________________________|__________________________________________________________________________|             
 ALIMENTARY SYSTEM                         |                                                                          |             
                                           |__________________________________________________________________________|             
   Esophagus                               | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Hemorrhage                           |                                     3                                    |             
                                           |__________________________________________________________________________|             
   Intestine Large, Colon                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                           |__________________________________________________________________________|             
   Intestine Large, Rectum                 | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                           |__________________________________________________________________________|             
   Intestine Large, Cecum                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                           |__________________________________________________________________________|             
   Intestine Small, Duodenum               | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                           |__________________________________________________________________________|             
   Intestine Small, Jejunum                | +  A  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                           |__________________________________________________________________________|             
   Intestine Small, Ileum                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                           |__________________________________________________________________________|             
   Liver                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Basophilic Focus                     | X              X     X     X                 X           X  X  X         |             
      Clear Cell Focus                     |          X                                                               |             
      Eosinophilic Focus                   |       X        X     X                                X                  |             
      Hepatodiaphragmatic Nodule           | X                                                              X         |             
      Infiltration Cellular, Mixed Cell    |                                  1  1                                    |             
      Mixed Cell Focus                     |                            X                             X               |             
      Bile Duct, Hyperplasia               |       1        2           1  3                 1  1     1  1  2         |             
      Centrilobular, Necrosis              |                                                                          |             
      Hepatocyte, Vacuolization Cytoplasmic|                         2                                                |             
      Kupffer Cell, Pigmentation           |                                                                          |             
                                           |__________________________________________________________________________|             
   Mesentery                               | +           +  +        +     +     +  +     +           +               |             
      Accessory Spleen                     |                                                                          |             
      Hemorrhage                           |                                                                          |             
      Fat, Necrosis                        | 2           2  4        3     2     2  2     3           1               |             
                                           |__________________________________________________________________________|             
   Oral Mucosa                             |                                                                          |             
                                           |__________________________________________________________________________|             
   Pancreas                                | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Atrophy                              |                1                 3  2                             2     1|             
      Cyst                                 |                                              3                           |             
 __________________________________________|__________________________________________________________________________|             
                                                                                                                                    
                                                                                                                                    
                                                             Page  87                                                               
                                                                                                                                   
NTP Experiment-Test: 93023-06                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09  
Study Type: CHRONIC                                           2,4-HEXADIENAL                                      Date: 03/14/01    
Route: GAVAGE                                                                                                     Time: 15:02:06    
 _____________________________________________________________________________________________________________________              
                                           | 7| 5| 7| 7| 7| 7| 3| 7| 6| 7| 6| 5| 7| 6| 6| 7| 7| 5| 7| 7| 7| 7| 7| 3| 7|             
                             DAY ON TEST   | 3| 6| 3| 3| 3| 3| 6| 2| 5| 3| 9| 7| 0| 3| 9| 2| 2| 7| 3| 3| 3| 3| 3| 5| 2|             
                                           | 0| 6| 0| 1| 1| 1| 4| 9| 5| 2| 7| 4| 9| 6| 1| 9| 9| 5| 0| 0| 0| 0| 0| 0| 9|             
 __________________________________________|__________________________________________________________________________|             
                                           | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|             
   FISCHER 344 RATS MALE                   | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|             
                               ANIMAL ID   | 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1|             
    90                                     | 5| 5| 5| 5| 5| 5| 5| 5| 5| 6| 6| 6| 6| 6| 6| 6| 6| 6| 6| 7| 7| 7| 7| 7| 7|             
    MG/KG/DY                               | 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5|             
 __________________________________________|__________________________________________________________________________|             
 ALIMENTARY SYSTEM - cont                  |                                                                          |             
      Acinus, Cytoplasmic Alteration       |                                           3                              |             
      Acinus, Hyperplasia, Focal           | 2     2        2     3                       2           2     2         |             
                                           |__________________________________________________________________________|             
   Salivary Glands                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Atrophy                              |                                                                          |             
                                           |__________________________________________________________________________|             
   Stomach, Forestomach                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Erosion                              |                                        1                                 |             
      Inflammation, Chronic Active         |                      3     3           2                                 |             
      Epithelium, Cyst                     |                                              3        3           3     3|             
      Epithelium, Hyperplasia              | 3  3  4  3  3  3  2  3  3  3  1  3  3  3  1  4  3  2  4  3  3  4  3  1  3|             
                                           |__________________________________________________________________________|             
   Stomach, Glandular                      | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Erosion                              |                                                 2                        |             
                                           |__________________________________________________________________________|             
   Tongue                                  |                                                 +                        |             
      Hyperplasia                          |                                                 3                        |             
                                           |__________________________________________________________________________|             
   Tooth                                   |                         +                                                |             
 _____________________________________________________________________________________________________________________|             
 CARDIOVASCULAR SYSTEM                     |                                                                          |             
                                           |__________________________________________________________________________|             
   Blood Vessel                            |                                              +                           |             
                                           |__________________________________________________________________________|             
   Heart                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Cardiomyopathy                       | 2  2  1  2  1  1  2  1  1  3     1  2  2  3     1  2  3  1  1  1  3     2|             
      Inflammation, Suppurative            |                   2                                                      |             
 _____________________________________________________________________________________________________________________|             
 ENDOCRINE SYSTEM                          |                                                                          |             
                                           |__________________________________________________________________________|             
   Adrenal Cortex                          | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Accessory Adrenal Cortical Nodule    |                      3     3           3  3  3  3     3           3      |             
      Angiectasis                          |                                                                          |             
      Degeneration, Fatty                  | 1              1                                         3  1     3      |             
      Hyperplasia, Diffuse                 |                                                                          |             
      Hyperplasia, Focal                   |                   2  2                                            2     4|             
      Hypertrophy, Focal                   |                1                                         3  2     2      |             
                                           |__________________________________________________________________________|             
 __________________________________________|__________________________________________________________________________|             
                                                                                                                                    
                                                                                                                                    
                                                             Page  88                                                               
                                                                                                                                   
NTP Experiment-Test: 93023-06                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09  
Study Type: CHRONIC                                           2,4-HEXADIENAL                                      Date: 03/14/01    
Route: GAVAGE                                                                                                     Time: 15:02:06    
 _____________________________________________________________________________________________________________________              
                                           | 7| 5| 7| 7| 7| 7| 3| 7| 6| 7| 6| 5| 7| 6| 6| 7| 7| 5| 7| 7| 7| 7| 7| 3| 7|             
                             DAY ON TEST   | 3| 6| 3| 3| 3| 3| 6| 2| 5| 3| 9| 7| 0| 3| 9| 2| 2| 7| 3| 3| 3| 3| 3| 5| 2|             
                                           | 0| 6| 0| 1| 1| 1| 4| 9| 5| 2| 7| 4| 9| 6| 1| 9| 9| 5| 0| 0| 0| 0| 0| 0| 9|             
 __________________________________________|__________________________________________________________________________|             
                                           | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|             
   FISCHER 344 RATS MALE                   | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|             
                               ANIMAL ID   | 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1|             
    90                                     | 5| 5| 5| 5| 5| 5| 5| 5| 5| 6| 6| 6| 6| 6| 6| 6| 6| 6| 6| 7| 7| 7| 7| 7| 7|             
    MG/KG/DY                               | 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5|             
 __________________________________________|__________________________________________________________________________|             
 ENDOCRINE SYSTEM - cont                   |                                                                          |             
   Adrenal Medulla                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Hyperplasia                          |                                                 2     2                  |             
                                           |__________________________________________________________________________|             
   Islets, Pancreatic                      | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                           |__________________________________________________________________________|             
   Parathyroid Gland                       | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                           |__________________________________________________________________________|             
   Pituitary Gland                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Cyst                                 |                                                             1            |             
      Pars Distalis, Angiectasis           |                                                                          |             
      Pars Distalis, Cyst                  | 3                                                                 3      |             
      Pars Distalis, Hyperplasia, Focal    | 3                       2                             1           1     1|             
      Pars Distalis, Hyperplasia           |                                                                          |             
      Pars Intermedia, Angiectasis         |                                                                          |             
      Pars Intermedia, Cyst                |                                                                          |             
                                           |__________________________________________________________________________|             
   Thyroid Gland                           | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      C-Cell, Hyperplasia                  |                      2     3              1     2                 2      |             
 _____________________________________________________________________________________________________________________|             
 GENERAL BODY SYSTEM                       |                                                                          |             
    None                                   |                                                                          |             
 _____________________________________________________________________________________________________________________|             
 GENITAL SYSTEM                            |                                                                          |             
                                           |__________________________________________________________________________|             
   Epididymis                              | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Atypia Cellular                      | 2     3  3  3  2     3  2     3     3  2  2     2     3  3  3  3  3     3|             
                                           |__________________________________________________________________________|             
   Preputial Gland                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Cyst                                 |       3                                                           3      |             
      Inflammation, Chronic                | 2     2  2           2                       2  2     2     2     2     3|             
                                           |__________________________________________________________________________|             
   Prostate                                | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Inflammation, Chronic                | 2           2        3  3  2           2  2  3                           |             
      Epithelium, Hyperplasia              |                                     3                                    |             
      Epithelium, Ventral, Degeneration    | 2                                                                        |             
      Epithelium, Ventral, Hyperplasia     |    2                       1                                      2      |             
      Ventral, Inflammation                | 2                                                                        |             
                                           |__________________________________________________________________________|             
 __________________________________________|__________________________________________________________________________|             
                                                                                                                                    
                                                                                                                                    
                                                             Page  89                                                               
                                                                                                                                   
NTP Experiment-Test: 93023-06                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09  
Study Type: CHRONIC                                           2,4-HEXADIENAL                                      Date: 03/14/01    
Route: GAVAGE                                                                                                     Time: 15:02:06    
 _____________________________________________________________________________________________________________________              
                                           | 7| 5| 7| 7| 7| 7| 3| 7| 6| 7| 6| 5| 7| 6| 6| 7| 7| 5| 7| 7| 7| 7| 7| 3| 7|             
                             DAY ON TEST   | 3| 6| 3| 3| 3| 3| 6| 2| 5| 3| 9| 7| 0| 3| 9| 2| 2| 7| 3| 3| 3| 3| 3| 5| 2|             
                                           | 0| 6| 0| 1| 1| 1| 4| 9| 5| 2| 7| 4| 9| 6| 1| 9| 9| 5| 0| 0| 0| 0| 0| 0| 9|             
 __________________________________________|__________________________________________________________________________|             
                                           | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|             
   FISCHER 344 RATS MALE                   | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|             
                               ANIMAL ID   | 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1|             
    90                                     | 5| 5| 5| 5| 5| 5| 5| 5| 5| 6| 6| 6| 6| 6| 6| 6| 6| 6| 6| 7| 7| 7| 7| 7| 7|             
    MG/KG/DY                               | 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5|             
 __________________________________________|__________________________________________________________________________|             
 GENITAL SYSTEM - cont                     |                                                                          |             
   Seminal Vesicle                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                           |__________________________________________________________________________|             
   Testes                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Germinal Epithelium, Atrophy         |                                           4  1                       2   |             
      Interstitial Cell, Hyperplasia       |                                  1           2                           |             
 _____________________________________________________________________________________________________________________|             
 HEMATOPOIETIC SYSTEM                      |                                                                          |             
                                           |__________________________________________________________________________|             
   Bone Marrow                             | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Hyperplasia                          |    3                                2                                    |             
                                           |__________________________________________________________________________|             
   Lymph Node                              |       +     +  +     +  +  +  +           +  +  +     +           +  +  +|             
      Deep Cervical, Hyperplasia, Lymphoid |                                                                          |             
      Mediastinal, Ectasia                 |                                                                          |             
      Mediastinal, Hyperplasia, Lymphoid   |             2  2                                                  3      |             
      Pancreatic, Ectasia                  |                                                                          |             
      Pancreatic, Hemorrhage               |                3     2  1  1              1           1           1     1|             
      Pancreatic, Hyperplasia, Lymphoid    |       2              2  2     2           2  1        2           2      |             
      Pancreatic, Pigmentation             |       2        1     1  1  2  1           1  1        2           1     1|             
                                           |__________________________________________________________________________|             
   Lymph Node, Mandibular                  | M  M  M  M  M  M  +  M  M  M  M  M  I  M  M  M  M  M  +  M  M  M  M  M  M|             
                                           |__________________________________________________________________________|             
   Lymph Node, Mesenteric                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Ectasia                              |                                                                          |             
      Hemorrhage                           | 1                       1                                                |             
      Hyperplasia, Lymphoid                | 2  2     2  2  2  3  2     2     3  2        2     2     2  2           2|             
      Pigmentation                         |    2  2  3     2           2     2  3           2           2  2  2      |             
                                           |__________________________________________________________________________|             
   Spleen                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Fibrosis                             |                                                                          |             
      Hematopoietic Cell Proliferation     | 1  2                                2                 1     2     1      |             
      Pigmentation                         |       3     3  3  3  2  3        2        4  2     2              2     3|             
      Lymphoid Follicle, Atrophy           |                   3                                                      |             
      Lymphoid Follicle, Hyperplasia       |                                                                   3      |             
                                           |__________________________________________________________________________|             
   Thymus                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Hemorrhage                           |                   3                                3                     |             
 __________________________________________|__________________________________________________________________________|             
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                             Page  90                                                               
                                                                                                                                   
NTP Experiment-Test: 93023-06                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09  
Study Type: CHRONIC                                           2,4-HEXADIENAL                                      Date: 03/14/01    
Route: GAVAGE                                                                                                     Time: 15:02:06    
 _____________________________________________________________________________________________________________________              
                                           | 7| 5| 7| 7| 7| 7| 3| 7| 6| 7| 6| 5| 7| 6| 6| 7| 7| 5| 7| 7| 7| 7| 7| 3| 7|             
                             DAY ON TEST   | 3| 6| 3| 3| 3| 3| 6| 2| 5| 3| 9| 7| 0| 3| 9| 2| 2| 7| 3| 3| 3| 3| 3| 5| 2|             
                                           | 0| 6| 0| 1| 1| 1| 4| 9| 5| 2| 7| 4| 9| 6| 1| 9| 9| 5| 0| 0| 0| 0| 0| 0| 9|             
 __________________________________________|__________________________________________________________________________|             
                                           | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|             
   FISCHER 344 RATS MALE                   | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|             
                               ANIMAL ID   | 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1|             
    90                                     | 5| 5| 5| 5| 5| 5| 5| 5| 5| 6| 6| 6| 6| 6| 6| 6| 6| 6| 6| 7| 7| 7| 7| 7| 7|             
    MG/KG/DY                               | 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5|             
 __________________________________________|__________________________________________________________________________|             
 INTEGUMENTARY SYSTEM                      |                                                                          |             
                                           |__________________________________________________________________________|             
   Mammary Gland                           | +  M  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  M  +  +|             
      Hyperplasia                          |       2     2        3        2     2  3  4  4                           |             
                                           |__________________________________________________________________________|             
   Skin                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Cyst Epithelial Inclusion            |                                                                         X|             
      Hyperkeratosis                       |                                     4                                    |             
      Ulcer                                |                                     3                                    |             
      Epidermis, Hyperplasia               |                                     3                                    |             
 _____________________________________________________________________________________________________________________|             
 MUSCULOSKELETAL SYSTEM                    |                                                                          |             
                                           |__________________________________________________________________________|             
   Bone                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                           |__________________________________________________________________________|             
   Skeletal Muscle                         |                                                                      +   |             
 _____________________________________________________________________________________________________________________|             
 NERVOUS SYSTEM                            |                                                                          |             
                                           |__________________________________________________________________________|             
   Brain                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Compression                          |                      3                    4  2                           |             
      Hydrocephalus                        |                                           2  2                       2   |             
                                           |__________________________________________________________________________|             
   Peripheral Nerve                        |                                                                          |             
                                           |__________________________________________________________________________|             
   Spinal Cord                             |                                                                          |             
 _____________________________________________________________________________________________________________________|             
 RESPIRATORY SYSTEM                        |                                                                          |             
                                           |__________________________________________________________________________|             
   Lung                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Congestion                           |                   3                                2                     |             
      Edema                                |    2                             2                 2                     |             
      Hemorrhage                           |                                  1  4                                    |             
      Infiltration Cellular, Histiocyte    | 1  2  2  1  2  1     1        1        1     1  2  1        1     2     1|             
      Inflammation, Granulomatous          |                            2                                             |             
      Inflammation, Suppurative            |                                                                          |             
      Metaplasia, Osseous                  |                                                                          |             
      Alveolar Epithelium, Hyperplasia     |                         2              1                          2      |             
                                           |__________________________________________________________________________|             
 __________________________________________|__________________________________________________________________________|             
                                                                                                                                    
                                                                                                                                    
                                                             Page  91                                                               
                                                                                                                                   
NTP Experiment-Test: 93023-06                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09  
Study Type: CHRONIC                                           2,4-HEXADIENAL                                      Date: 03/14/01    
Route: GAVAGE                                                                                                     Time: 15:02:06    
 _____________________________________________________________________________________________________________________              
                                           | 7| 5| 7| 7| 7| 7| 3| 7| 6| 7| 6| 5| 7| 6| 6| 7| 7| 5| 7| 7| 7| 7| 7| 3| 7|             
                             DAY ON TEST   | 3| 6| 3| 3| 3| 3| 6| 2| 5| 3| 9| 7| 0| 3| 9| 2| 2| 7| 3| 3| 3| 3| 3| 5| 2|             
                                           | 0| 6| 0| 1| 1| 1| 4| 9| 5| 2| 7| 4| 9| 6| 1| 9| 9| 5| 0| 0| 0| 0| 0| 0| 9|             
 __________________________________________|__________________________________________________________________________|             
                                           | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|             
   FISCHER 344 RATS MALE                   | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|             
                               ANIMAL ID   | 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1|             
    90                                     | 5| 5| 5| 5| 5| 5| 5| 5| 5| 6| 6| 6| 6| 6| 6| 6| 6| 6| 6| 7| 7| 7| 7| 7| 7|             
    MG/KG/DY                               | 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5|             
 __________________________________________|__________________________________________________________________________|             
 RESPIRATORY SYSTEM - cont                 |                                                                          |             
   Nose                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Foreign Body                         |                                                                          |             
      Inflammation, Chronic                |                         2                                                |             
      Olfactory Epithelium, Atrophy        |                                           2                              |             
      Respiratory Epithelium, Hyperplasia  |                                                                          |             
                                           |__________________________________________________________________________|             
   Trachea                                 | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
 _____________________________________________________________________________________________________________________|             
 SPECIAL SENSES SYSTEM                     |                                                                          |             
                                           |__________________________________________________________________________|             
   Eye                                     |                                     +                                    |             
      Cataract                             |                                     4                                    |             
      Hemorrhage                           |                                                                          |             
      Inflammation, Chronic                |                                                                          |             
      Retina, Degeneration                 |                                                                          |             
                                           |__________________________________________________________________________|             
   Harderian Gland                         |                         +                                                |             
                                           |__________________________________________________________________________|             
   Zymbal's Gland                          |                                                                          |             
 _____________________________________________________________________________________________________________________|             
 URINARY SYSTEM                            |                                                                          |             
                                           |__________________________________________________________________________|             
   Kidney                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Cyst                                 |       3                                                                  |             
      Glomerulosclerosis                   |                                                                          |             
      Inflammation, Chronic                |                            2                                             |             
      Nephropathy                          | 1     1     2        1     1     1              1  1     1  1  1         |             
      Renal Tubule, Cytoplasmic Alteration |                               2                                          |             
      Renal Tubule, Pigmentation           |                               2                                          |             
      Transitional Epithelium, Hyperplasia |                                                                          |             
                                           |__________________________________________________________________________|             
   Urinary Bladder                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Hemorrhage                           |                                                                          |             
 __________________________________________|__________________________________________________________________________              
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                             Page  92                                                               
                                                                                                                                   
NTP Experiment-Test: 93023-06                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09  
Study Type: CHRONIC                                           2,4-HEXADIENAL                                      Date: 03/14/01    
Route: GAVAGE                                                                                                     Time: 15:02:06    
 __________________________________________________________________________________________________________________________________ 
                                           | 6| 7| 4| 7| 7| 7| 6| 3| 6| 7| 6| 7| 7| 7| 7| 1| 6| 7| 7| 7| 7| 7| 7| 7| 7|            |
                             DAY ON TEST   | 5| 2| 9| 3| 3| 1| 2| 6| 4| 3| 5| 3| 0| 3| 2| 4| 0| 3| 3| 3| 3| 3| 3| 2| 2|            |
                                           | 1| 9| 6| 1| 1| 5| 0| 4| 3| 1| 9| 0| 5| 0| 9| 8| 9| 2| 2| 2| 0| 0| 0| 9| 9|            |
 __________________________________________|__________________________________________________________________________|      T (*) |
                                           | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|      O     |
   FISCHER 344 RATS MALE                   | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|      T     |
                               ANIMAL ID   | 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 2|      A     |
    90                                     | 7| 7| 7| 7| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 0|      L     |
    MG/KG/DY                               | 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0|            |
 _____________________________________________________________________________________________________________________|____________|
 ALIMENTARY SYSTEM                         |                                                                          |            |
                                           |__________________________________________________________________________|____________|
   Esophagus                               | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Hemorrhage                           |                                                                          |      1  3.0|
                                           |__________________________________________________________________________|____________|
   Intestine Large, Colon                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
                                           |__________________________________________________________________________|____________|
   Intestine Large, Rectum                 | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
                                           |__________________________________________________________________________|____________|
   Intestine Large, Cecum                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
                                           |__________________________________________________________________________|____________|
   Intestine Small, Duodenum               | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
                                           |__________________________________________________________________________|____________|
   Intestine Small, Jejunum                | +  +  +  +  +  +  +  A  +  +  +  +  +  +  +  +  A  +  +  +  +  +  +  +  +|  47        |
                                           |__________________________________________________________________________|____________|
   Intestine Small, Ileum                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
                                           |__________________________________________________________________________|____________|
   Liver                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Basophilic Focus                     |    X  X  X  X  X                 X     X  X     X  X  X  X  X  X  X      |     23     |
      Clear Cell Focus                     |             X              X     X     X                 X  X            |      7     |
      Eosinophilic Focus                   |                                           X                              |      5     |
      Hepatodiaphragmatic Nodule           |    X                    X                 X           X                  |      6     |
      Infiltration Cellular, Mixed Cell    | 1                                                                        |      3  1.0|
      Mixed Cell Focus                     |                                                                          |      2     |
      Bile Duct, Hyperplasia               |          2                       1        1                    3     1  1|     15  1.5|
      Centrilobular, Necrosis              |                   1                                                      |      1  1.0|
      Hepatocyte, Vacuolization Cytoplasmic|                                                                          |      1  2.0|
      Kupffer Cell, Pigmentation           |          2                                                               |      1  2.0|
                                           |__________________________________________________________________________|____________|
   Mesentery                               |       +           +        +                       +  +  +  +           +|  17        |
      Accessory Spleen                     |                                                       X  X               |      2     |
      Hemorrhage                           |       4                                                                  |      1  4.0|
      Fat, Necrosis                        |                   3        2                       4        3           3|     14  2.6|
                                           |__________________________________________________________________________|____________|
   Oral Mucosa                             |    +                                                                     |   1        |
 _____________________________________________________________________________________________________________________|____________|
                                                                                                                                    
  * : Total animals with tissue examined microscopically; total animals with lesion and mean severity grade                         
  + : Tissue examined microscopically                M : Missing tissue                        1-4 : Lesion qualified as:           
  X : Lesion present but not qualified               A : Autolysis precludes examination               1) Minimal  3) Moderate      
  I : Insufficient tissue                        BLANK : Not examined                                  2) Mild     4) Marked        
                                                                                                                                    
                                                             Page  93                                                               
                                                                                                                                   
NTP Experiment-Test: 93023-06                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09  
Study Type: CHRONIC                                           2,4-HEXADIENAL                                      Date: 03/14/01    
Route: GAVAGE                                                                                                     Time: 15:02:06    
 __________________________________________________________________________________________________________________________________ 
                                           | 6| 7| 4| 7| 7| 7| 6| 3| 6| 7| 6| 7| 7| 7| 7| 1| 6| 7| 7| 7| 7| 7| 7| 7| 7|            |
                             DAY ON TEST   | 5| 2| 9| 3| 3| 1| 2| 6| 4| 3| 5| 3| 0| 3| 2| 4| 0| 3| 3| 3| 3| 3| 3| 2| 2|            |
                                           | 1| 9| 6| 1| 1| 5| 0| 4| 3| 1| 9| 0| 5| 0| 9| 8| 9| 2| 2| 2| 0| 0| 0| 9| 9|            |
 __________________________________________|__________________________________________________________________________|      T (*) |
                                           | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|      O     |
   FISCHER 344 RATS MALE                   | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|      T     |
                               ANIMAL ID   | 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 2|      A     |
    90                                     | 7| 7| 7| 7| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 0|      L     |
    MG/KG/DY                               | 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0|            |
 _____________________________________________________________________________________________________________________|____________|
 ALIMENTARY SYSTEM - cont                  |                                                                          |            |
                                           |__________________________________________________________________________|____________|
   Pancreas                                | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Atrophy                              | 2     1                    4        3  2              1        1  1      |     13  1.8|
      Cyst                                 |                                                    3                     |      2  3.0|
      Acinus, Cytoplasmic Alteration       |                3                                                         |      2  3.0|
      Acinus, Hyperplasia, Focal           |             2  3           3              3                    2         |     12  2.3|
                                           |__________________________________________________________________________|____________|
   Salivary Glands                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Atrophy                              |                                           1                              |      1  1.0|
                                           |__________________________________________________________________________|____________|
   Stomach, Forestomach                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Erosion                              |                                                                          |      1  1.0|
      Inflammation, Chronic Active         |                   3           3                 2                        |      6  2.7|
      Epithelium, Cyst                     |                                     3                                    |      5  3.0|
      Epithelium, Hyperplasia              | 3  3  2  3  3  2  2  1  3  3  3  3  4  3  3  2  3  3  3  4  4  3  4  3  3|     50  2.9|
                                           |__________________________________________________________________________|____________|
   Stomach, Glandular                      | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Erosion                              |                                     2                                    |      2  2.0|
                                           |__________________________________________________________________________|____________|
   Tongue                                  |                                                                          |   1        |
      Hyperplasia                          |                                                                          |      1  3.0|
                                           |__________________________________________________________________________|____________|
   Tooth                                   |                         +                                                |   2        |
 _____________________________________________________________________________________________________________________|            |
 CARDIOVASCULAR SYSTEM                     |                                                                          |            |
                                           |__________________________________________________________________________|____________|
   Blood Vessel                            |                                                                          |   1        |
                                           |__________________________________________________________________________|____________|
   Heart                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Cardiomyopathy                       | 1  3     1  3  2        1  2     1     3  3     1  2  3  2     3  2  1  2|     40  1.9|
      Inflammation, Suppurative            |                                                                          |      1  2.0|
 _____________________________________________________________________________________________________________________|            |
 ENDOCRINE SYSTEM                          |                                                                          |            |
                                           |__________________________________________________________________________|____________|
 _____________________________________________________________________________________________________________________|____________|
                                                                                                                                    
  * : Total animals with tissue examined microscopically; total animals with lesion and mean severity grade                         
  + : Tissue examined microscopically                M : Missing tissue                        1-4 : Lesion qualified as:           
  X : Lesion present but not qualified               A : Autolysis precludes examination               1) Minimal  3) Moderate      
  I : Insufficient tissue                        BLANK : Not examined                                  2) Mild     4) Marked        
                                                                                                                                    
                                                             Page  94                                                               
                                                                                                                                   
NTP Experiment-Test: 93023-06                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09  
Study Type: CHRONIC                                           2,4-HEXADIENAL                                      Date: 03/14/01    
Route: GAVAGE                                                                                                     Time: 15:02:06    
 __________________________________________________________________________________________________________________________________ 
                                           | 6| 7| 4| 7| 7| 7| 6| 3| 6| 7| 6| 7| 7| 7| 7| 1| 6| 7| 7| 7| 7| 7| 7| 7| 7|            |
                             DAY ON TEST   | 5| 2| 9| 3| 3| 1| 2| 6| 4| 3| 5| 3| 0| 3| 2| 4| 0| 3| 3| 3| 3| 3| 3| 2| 2|            |
                                           | 1| 9| 6| 1| 1| 5| 0| 4| 3| 1| 9| 0| 5| 0| 9| 8| 9| 2| 2| 2| 0| 0| 0| 9| 9|            |
 __________________________________________|__________________________________________________________________________|      T (*) |
                                           | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|      O     |
   FISCHER 344 RATS MALE                   | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|      T     |
                               ANIMAL ID   | 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 2|      A     |
    90                                     | 7| 7| 7| 7| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 0|      L     |
    MG/KG/DY                               | 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0|            |
 _____________________________________________________________________________________________________________________|____________|
 ENDOCRINE SYSTEM - cont                   |                                                                          |            |
   Adrenal Cortex                          | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Accessory Adrenal Cortical Nodule    | 3              3  3                    3        3     3        3  3  3   |     17  3.0|
      Angiectasis                          |                            3                          3                  |      2  3.0|
      Degeneration, Fatty                  |          2     2     1     4        1                             1      |     11  1.8|
      Hyperplasia, Diffuse                 |                            3                                             |      1  3.0|
      Hyperplasia, Focal                   |                                        2                       1         |      6  2.2|
      Hypertrophy, Focal                   |          2           2                                   1        2      |      8  1.9|
                                           |__________________________________________________________________________|____________|
   Adrenal Medulla                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  M  +  +  +  +  +|  49        |
      Hyperplasia                          |          1        1     2                                                |      5  1.6|
                                           |__________________________________________________________________________|____________|
   Islets, Pancreatic                      | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
                                           |__________________________________________________________________________|____________|
   Parathyroid Gland                       | I  +  +  +  +  +  M  +  +  +  +  +  +  +  +  +  M  +  +  +  +  +  +  +  +|  47        |
                                           |__________________________________________________________________________|____________|
   Pituitary Gland                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Cyst                                 |                                                                          |      1  1.0|
      Pars Distalis, Angiectasis           |    3                                                                     |      1  3.0|
      Pars Distalis, Cyst                  |          3                       3     3        3  3     3               |      8  3.0|
      Pars Distalis, Hyperplasia, Focal    |          2                       2                       3        2      |      9  1.9|
      Pars Distalis, Hyperplasia           |             3                                                        3   |      2  3.0|
      Pars Intermedia, Angiectasis         |    3                                                        3            |      2  3.0|
      Pars Intermedia, Cyst                |          3  3                                                     3     3|      4  3.0|
                                           |__________________________________________________________________________|____________|
   Thyroid Gland                           | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      C-Cell, Hyperplasia                  |    2     1                 1        1                    1               |     10  1.6|
 _____________________________________________________________________________________________________________________|            |
 GENERAL BODY SYSTEM                       |                                                                          |            |
    None                                   |                                                                          |            |
 _____________________________________________________________________________________________________________________|            |
 GENITAL SYSTEM                            |                                                                          |            |
                                           |__________________________________________________________________________|____________|
   Epididymis                              | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Atypia Cellular                      | 3  3     3  3  3  2        3  2  2  3  3  3        3  3  2  3  2  3  4   |     37  2.7|
 _____________________________________________________________________________________________________________________|____________|
                                                                                                                                    
  * : Total animals with tissue examined microscopically; total animals with lesion and mean severity grade                         
  + : Tissue examined microscopically                M : Missing tissue                        1-4 : Lesion qualified as:           
  X : Lesion present but not qualified               A : Autolysis precludes examination               1) Minimal  3) Moderate      
  I : Insufficient tissue                        BLANK : Not examined                                  2) Mild     4) Marked        
                                                                                                                                    
                                                             Page  95                                                               
                                                                                                                                   
NTP Experiment-Test: 93023-06                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09  
Study Type: CHRONIC                                           2,4-HEXADIENAL                                      Date: 03/14/01    
Route: GAVAGE                                                                                                     Time: 15:02:06    
 __________________________________________________________________________________________________________________________________ 
                                           | 6| 7| 4| 7| 7| 7| 6| 3| 6| 7| 6| 7| 7| 7| 7| 1| 6| 7| 7| 7| 7| 7| 7| 7| 7|            |
                             DAY ON TEST   | 5| 2| 9| 3| 3| 1| 2| 6| 4| 3| 5| 3| 0| 3| 2| 4| 0| 3| 3| 3| 3| 3| 3| 2| 2|            |
                                           | 1| 9| 6| 1| 1| 5| 0| 4| 3| 1| 9| 0| 5| 0| 9| 8| 9| 2| 2| 2| 0| 0| 0| 9| 9|            |
 __________________________________________|__________________________________________________________________________|      T (*) |
                                           | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|      O     |
   FISCHER 344 RATS MALE                   | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|      T     |
                               ANIMAL ID   | 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 2|      A     |
    90                                     | 7| 7| 7| 7| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 0|      L     |
    MG/KG/DY                               | 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0|            |
 _____________________________________________________________________________________________________________________|____________|
 GENITAL SYSTEM - cont                     |                                                                          |            |
                                           |__________________________________________________________________________|____________|
   Preputial Gland                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Cyst                                 |                                                                          |      2  3.0|
      Inflammation, Chronic                |       2  2  3           3  2     2     3  3        2  2  3  2  2     2   |     24  2.3|
                                           |__________________________________________________________________________|____________|
   Prostate                                | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Inflammation, Chronic                | 3  3              2                                   2           3      |     13  2.5|
      Epithelium, Hyperplasia              |                                  1                                      1|      3  1.7|
      Epithelium, Ventral, Degeneration    |                                                                          |      1  2.0|
      Epithelium, Ventral, Hyperplasia     |    3  1     3  1              2           4           3                  |     10  2.2|
      Ventral, Inflammation                |                                                                          |      1  2.0|
                                           |__________________________________________________________________________|____________|
   Seminal Vesicle                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
                                           |__________________________________________________________________________|____________|
   Testes                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Germinal Epithelium, Atrophy         |                                                          2        3      |      5  2.4|
      Interstitial Cell, Hyperplasia       |       1                                                  1        2      |      5  1.4|
 _____________________________________________________________________________________________________________________|            |
 HEMATOPOIETIC SYSTEM                      |                                                                          |            |
                                           |__________________________________________________________________________|____________|
   Bone Marrow                             | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Hyperplasia                          |                2                                                     2   |      4  2.3|
                                           |__________________________________________________________________________|____________|
   Lymph Node                              |    +     +     +  +     +     +  +  +  +           +  +     +  +  +     M|  28        |
      Deep Cervical, Hyperplasia, Lymphoid |                4                                                         |      1  4.0|
      Mediastinal, Ectasia                 |                   3                                                      |      1  3.0|
      Mediastinal, Hyperplasia, Lymphoid   |    3                                                                     |      4  2.5|
      Pancreatic, Ectasia                  |                                                       4           4      |      2  4.0|
      Pancreatic, Hemorrhage               |                                  1     3              2                  |     11  1.5|
      Pancreatic, Hyperplasia, Lymphoid    |          2              2     2  2     1                    1  2  2      |     16  1.8|
      Pancreatic, Pigmentation             |          2        1     1     1  2  2  2           1  2     2  1  2      |     23  1.4|
                                           |__________________________________________________________________________|____________|
   Lymph Node, Mandibular                  | M  M  M  M  M  M  M  M  M  M  M  M  M  M  M  M  M  M  M  M  M  M  M  M  M|   2        |
                                           |__________________________________________________________________________|____________|
 _____________________________________________________________________________________________________________________|____________|
                                                                                                                                    
  * : Total animals with tissue examined microscopically; total animals with lesion and mean severity grade                         
  + : Tissue examined microscopically                M : Missing tissue                        1-4 : Lesion qualified as:           
  X : Lesion present but not qualified               A : Autolysis precludes examination               1) Minimal  3) Moderate      
  I : Insufficient tissue                        BLANK : Not examined                                  2) Mild     4) Marked        
                                                                                                                                    
                                                             Page  96                                                               
                                                                                                                                   
NTP Experiment-Test: 93023-06                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09  
Study Type: CHRONIC                                           2,4-HEXADIENAL                                      Date: 03/14/01    
Route: GAVAGE                                                                                                     Time: 15:02:06    
 __________________________________________________________________________________________________________________________________ 
                                           | 6| 7| 4| 7| 7| 7| 6| 3| 6| 7| 6| 7| 7| 7| 7| 1| 6| 7| 7| 7| 7| 7| 7| 7| 7|            |
                             DAY ON TEST   | 5| 2| 9| 3| 3| 1| 2| 6| 4| 3| 5| 3| 0| 3| 2| 4| 0| 3| 3| 3| 3| 3| 3| 2| 2|            |
                                           | 1| 9| 6| 1| 1| 5| 0| 4| 3| 1| 9| 0| 5| 0| 9| 8| 9| 2| 2| 2| 0| 0| 0| 9| 9|            |
 __________________________________________|__________________________________________________________________________|      T (*) |
                                           | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|      O     |
   FISCHER 344 RATS MALE                   | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|      T     |
                               ANIMAL ID   | 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 2|      A     |
    90                                     | 7| 7| 7| 7| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 0|      L     |
    MG/KG/DY                               | 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0|            |
 _____________________________________________________________________________________________________________________|____________|
 HEMATOPOIETIC SYSTEM - cont               |                                                                          |            |
   Lymph Node, Mesenteric                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Ectasia                              |                                                          2               |      1  2.0|
      Hemorrhage                           | 1                                                                    1   |      4  1.0|
      Hyperplasia, Lymphoid                |    2  2           2  3                    2        2     3               |     22  2.2|
      Pigmentation                         |    2  2        2  2  2                    2     2              2  2  2   |     21  2.1|
                                           |__________________________________________________________________________|____________|
   Spleen                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Fibrosis                             |                                                                         3|      1  3.0|
      Hematopoietic Cell Proliferation     |                2        1  2           1  2           3  1        1      |     14  1.6|
      Pigmentation                         | 2                    3                    2  3  3     2  2        2      |     20  2.6|
      Lymphoid Follicle, Atrophy           |                      3                       2                           |      3  2.7|
      Lymphoid Follicle, Hyperplasia       |                                                                          |      1  3.0|
                                           |__________________________________________________________________________|____________|
   Thymus                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  M  +  +  +  +  +  +  +  +  +|  49        |
      Hemorrhage                           |                                                                          |      2  3.0|
 _____________________________________________________________________________________________________________________|            |
 INTEGUMENTARY SYSTEM                      |                                                                          |            |
                                           |__________________________________________________________________________|____________|
   Mammary Gland                           | +  +  +  +  +  +  +  +  +  M  +  M  +  +  +  +  +  M  M  +  +  +  +  +  +|  44        |
      Hyperplasia                          |                2                                                     1   |     10  2.5|
                                           |__________________________________________________________________________|____________|
   Skin                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Cyst Epithelial Inclusion            |                            X                                             |      2     |
      Hyperkeratosis                       |                                                                          |      1  4.0|
      Ulcer                                |                4                                                         |      2  3.5|
      Epidermis, Hyperplasia               |                                                                          |      1  3.0|
 _____________________________________________________________________________________________________________________|            |
 MUSCULOSKELETAL SYSTEM                    |                                                                          |            |
                                           |__________________________________________________________________________|____________|
   Bone                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
                                           |__________________________________________________________________________|____________|
   Skeletal Muscle                         | +                                   +                                    |   3        |
 _____________________________________________________________________________________________________________________|            |
 NERVOUS SYSTEM                            |                                                                          |            |
 _____________________________________________________________________________________________________________________|____________|
                                                                                                                                    
  * : Total animals with tissue examined microscopically; total animals with lesion and mean severity grade                         
  + : Tissue examined microscopically                M : Missing tissue                        1-4 : Lesion qualified as:           
  X : Lesion present but not qualified               A : Autolysis precludes examination               1) Minimal  3) Moderate      
  I : Insufficient tissue                        BLANK : Not examined                                  2) Mild     4) Marked        
                                                                                                                                    
                                                             Page  97                                                               
                                                                                                                                   
NTP Experiment-Test: 93023-06                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09  
Study Type: CHRONIC                                           2,4-HEXADIENAL                                      Date: 03/14/01    
Route: GAVAGE                                                                                                     Time: 15:02:06    
 __________________________________________________________________________________________________________________________________ 
                                           | 6| 7| 4| 7| 7| 7| 6| 3| 6| 7| 6| 7| 7| 7| 7| 1| 6| 7| 7| 7| 7| 7| 7| 7| 7|            |
                             DAY ON TEST   | 5| 2| 9| 3| 3| 1| 2| 6| 4| 3| 5| 3| 0| 3| 2| 4| 0| 3| 3| 3| 3| 3| 3| 2| 2|            |
                                           | 1| 9| 6| 1| 1| 5| 0| 4| 3| 1| 9| 0| 5| 0| 9| 8| 9| 2| 2| 2| 0| 0| 0| 9| 9|            |
 __________________________________________|__________________________________________________________________________|      T (*) |
                                           | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|      O     |
   FISCHER 344 RATS MALE                   | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|      T     |
                               ANIMAL ID   | 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 2|      A     |
    90                                     | 7| 7| 7| 7| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 0|      L     |
    MG/KG/DY                               | 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0|            |
 _____________________________________________________________________________________________________________________|____________|
 NERVOUS SYSTEM - cont                     |                                                                          |            |
                                           |__________________________________________________________________________|____________|
   Brain                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Compression                          |                                                                          |      3  3.0|
      Hydrocephalus                        |                                                                          |      3  2.0|
                                           |__________________________________________________________________________|____________|
   Peripheral Nerve                        | +                                   +                                    |   2        |
                                           |__________________________________________________________________________|____________|
   Spinal Cord                             | +                                   +                                    |   2        |
 _____________________________________________________________________________________________________________________|            |
 RESPIRATORY SYSTEM                        |                                                                          |            |
                                           |__________________________________________________________________________|____________|
   Lung                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Congestion                           |                      2                                                   |      3  2.3|
      Edema                                |                      3                       3                           |      5  2.4|
      Hemorrhage                           |                1                             2                           |      4  2.0|
      Infiltration Cellular, Histiocyte    | 1  1     1     1        1  1              1  3     1  1     1        1   |     27  1.3|
      Inflammation, Granulomatous          |                                                                          |      1  2.0|
      Inflammation, Suppurative            |                                              3                           |      1  3.0|
      Metaplasia, Osseous                  |                      1                                                   |      1  1.0|
      Alveolar Epithelium, Hyperplasia     |                3                          1                    3         |      6  2.0|
                                           |__________________________________________________________________________|____________|
   Nose                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Foreign Body                         |                   X                          X                           |      2     |
      Inflammation, Chronic                | 2        2        1  3           1           3  2                        |      8  2.0|
      Olfactory Epithelium, Atrophy        |                3                                                         |      2  2.5|
      Respiratory Epithelium, Hyperplasia  |                   1                                                      |      1  1.0|
                                           |__________________________________________________________________________|____________|
   Trachea                                 | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
 _____________________________________________________________________________________________________________________|            |
 SPECIAL SENSES SYSTEM                     |                                                                          |            |
                                           |__________________________________________________________________________|____________|
   Eye                                     |    +                                                     +               |   3        |
      Cataract                             |                                                          3               |      2  3.5|
      Hemorrhage                           |    4                                                                     |      1  4.0|
 _____________________________________________________________________________________________________________________|____________|
                                                                                                                                    
  * : Total animals with tissue examined microscopically; total animals with lesion and mean severity grade                         
  + : Tissue examined microscopically                M : Missing tissue                        1-4 : Lesion qualified as:           
  X : Lesion present but not qualified               A : Autolysis precludes examination               1) Minimal  3) Moderate      
  I : Insufficient tissue                        BLANK : Not examined                                  2) Mild     4) Marked        
                                                                                                                                    
                                                             Page  98                                                               
                                                                                                                                   
NTP Experiment-Test: 93023-06                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09  
Study Type: CHRONIC                                           2,4-HEXADIENAL                                      Date: 03/14/01    
Route: GAVAGE                                                                                                     Time: 15:02:06    
 __________________________________________________________________________________________________________________________________ 
                                           | 6| 7| 4| 7| 7| 7| 6| 3| 6| 7| 6| 7| 7| 7| 7| 1| 6| 7| 7| 7| 7| 7| 7| 7| 7|            |
                             DAY ON TEST   | 5| 2| 9| 3| 3| 1| 2| 6| 4| 3| 5| 3| 0| 3| 2| 4| 0| 3| 3| 3| 3| 3| 3| 2| 2|            |
                                           | 1| 9| 6| 1| 1| 5| 0| 4| 3| 1| 9| 0| 5| 0| 9| 8| 9| 2| 2| 2| 0| 0| 0| 9| 9|            |
 __________________________________________|__________________________________________________________________________|      T (*) |
                                           | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|      O     |
   FISCHER 344 RATS MALE                   | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|      T     |
                               ANIMAL ID   | 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 2|      A     |
    90                                     | 7| 7| 7| 7| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 0|      L     |
    MG/KG/DY                               | 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0|            |
 _____________________________________________________________________________________________________________________|____________|
 SPECIAL SENSES SYSTEM - cont              |                                                                          |            |
      Inflammation, Chronic                |    4                                                                     |      1  4.0|
      Retina, Degeneration                 |                                                          4               |      1  4.0|
                                           |__________________________________________________________________________|____________|
   Harderian Gland                         |                                                                          |   1        |
                                           |__________________________________________________________________________|____________|
   Zymbal's Gland                          |                +        +                                                |   2        |
 _____________________________________________________________________________________________________________________|            |
 URINARY SYSTEM                            |                                                                          |            |
                                           |__________________________________________________________________________|____________|
   Kidney                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Cyst                                 |                                                                          |      1  3.0|
      Glomerulosclerosis                   |          2                                                               |      1  2.0|
      Inflammation, Chronic                |                            3                                             |      2  2.5|
      Nephropathy                          |          1        1        3     1     1              1  1           1   |     19  1.2|
      Renal Tubule, Cytoplasmic Alteration |                   2                                                      |      2  2.0|
      Renal Tubule, Pigmentation           |       3           2                                                      |      3  2.3|
      Transitional Epithelium, Hyperplasia |                                                                         1|      1  1.0|
                                           |__________________________________________________________________________|____________|
   Urinary Bladder                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Hemorrhage                           | 3                                                                        |      1  3.0|
 __________________________________________________________________________________________________________________________________ 
                                                                                                                                    
  * : Total animals with tissue examined microscopically; total animals with lesion and mean severity grade                         
  + : Tissue examined microscopically                M : Missing tissue                        1-4 : Lesion qualified as:           
  X : Lesion present but not qualified               A : Autolysis precludes examination               1) Minimal  3) Moderate      
  I : Insufficient tissue                        BLANK : Not examined                                  2) Mild     4) Marked        
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                                                                                                    
                                                             Page  99                                                               
                                                                                                                                   
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                             ----------              END OF REPORT             ----------                                           
                             ------------------------------------------------------------                                           
NTP is located at the National Institute of Environmental Health Sciences, part of the National Institutes of Health.