National Toxicology Program

National Toxicology Program
https://ntp.niehs.nih.gov/go/5785

TDMS Study 89002-02 Pathology Tables

NTP Experiment-Test: 89002-02                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09
Study Type: CHRONIC                                         PENTACHLOROPHENOL                                     Date: 08/19/97
Route: DOSED FEED                                                                                                 Time: 11:06:29

                                                           Core Study




       Facility:  Battelle Columbus Laboratory

       Chemical CAS #:  87-86-5

       Lock Date:  07/13/95

       Cage Range:  All

       Reasons For Removal:    25019 Moribund Sacrifice                25020 Natural Death
                               25021 Terminal Sacrifice

       Removal Date Range:     All

       Treatment Groups:       Include 001    0 PPM
                               Include 002    0 PPM
                               Include 003    200 PPM
                               Include 004    200 PPM
                               Include 005    400 PPM
                               Include 006    400 PPM
                               Include 007    600 PPM
                               Include 008    600 PPM




























                                                              Page   1


NTP Experiment-Test: 89002-02                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09
Study Type: CHRONIC                                         PENTACHLOROPHENOL                                     Date: 08/19/97  
Route: DOSED FEED                                                                                                 Time: 11:06:29  
                                                                                                                                    
 _____________________________________________________________________________________________________________________              
                                           | 7| 6| 6| 7| 7| 5| 7| 7| 7| 5| 7| 7| 7| 7| 6| 7| 7| 7| 7| 7| 7| 7| 4| 6| 5|             
                             DAY ON TEST   | 0| 6| 9| 3| 3| 4| 3| 3| 3| 2| 3| 1| 4| 3| 4| 3| 4| 4| 0| 4| 3| 3| 6| 9| 7|             
                                           | 4| 3| 6| 8| 9| 4| 9| 9| 9| 3| 8| 5| 0| 8| 5| 9| 0| 0| 5| 0| 8| 9| 1| 8| 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| 3| 3| 3|             
    0 PPM                                  | 7| 7| 7| 7| 7| 8| 8| 8| 8| 8| 8| 8| 8| 9| 9| 9| 9| 9| 9| 9| 9| 9| 0| 0| 0|             
                                           | 1| 2| 3| 7| 9| 1| 2| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 0| 1| 2|             
 _____________________________________________________________________________________________________________________|             
 ALIMENTARY SYSTEM                         |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Esophagus                               | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Intestine Large, Colon                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Inflammation, Suppurative            |                                                                          |             
                                            __________________________________________________________________________|             
   Intestine Large, Rectum                 | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Parasite Metazoan                    |                                                    X                     |             
                                            __________________________________________________________________________|             
   Intestine Large, Cecum                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Intestine Small, Duodenum               | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Intestine Small, Jejunum                | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Intestine Small, Ileum                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Parasite Metazoan                    | X                                                                        |             
                                            __________________________________________________________________________|             
   Liver                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Basophilic Focus                     |    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           X                 X  X           X         |             
      Eosinophilic Focus                   |                                                    X                     |             
      Hepatodiaphragmatic Nodule           |             X           X                                      X         |             
      Inflammation, Chronic                |          1  1     1  1     2  2     2  1     2  2  2        1  1     1   |             
      Mixed Cell Focus                     |             X        X                          X              X         |             
      Pigmentation, Hemosiderin            | 2                                                                        |             
      Thrombosis                           |                                  2                                       |             
      Bile Duct, Hyperplasia               | 2     2  1  1     1  1  1        1        1        1  2     1  1     1   |             
      Hepatocyte, Vacuolization Cytoplasmic|       3              1           2        2                    1         |             
      Hepatocyte, Centrilobular, Necrosis  |                                                                          |             
                                            __________________________________________________________________________|             
   Mesentery                               |                   +  +  +                                                |             
      Accessory Spleen                     |                                                                          |             
      Artery, Inflammation, Chronic Active |                                                                          |             
      Fat, Necrosis                        |                      4  4                                                |             
                                            __________________________________________________________________________|             
   Oral Mucosa                             |          +                                                               |             
                                            __________________________________________________________________________|             
   Pancreas                                | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Acinus, Atrophy                      |                   2     1     1  1           1        2                  |             
                                            __________________________________________________________________________|             
   Salivary Glands                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Stomach, Forestomach                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Inflammation, Chronic Active         |                                                                          |             
      Epithelium, Hyperplasia              | 2                                                                        |             
      Epithelium, Ulcer                    |                                                                          |             
                                            __________________________________________________________________________|             
   Stomach, Glandular                      | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Epithelium, Erosion                  |       2                                                                  |             
                                            __________________________________________________________________________|             
   Tongue                                  |                         +                                                |             
 _____________________________________________________________________________________________________________________|             
 CARDIOVASCULAR SYSTEM                     |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Blood Vessel                            | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Aorta, Inflammation, Chronic Active  |                                                                          |             
                                            __________________________________________________________________________|             
   Heart                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Cardiomyopathy, Chronic              | 1  1        1  1     1     1  1  1  1  1  1  1           1  2     1  1   |             
 _____________________________________________________________________________________________________________________|             
 ENDOCRINE SYSTEM                          |                                                                          |             
 _____________________________________________________________________________________________________________________|             

                                                             Page   2                                                               
NTP Experiment-Test: 89002-02                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09
Study Type: CHRONIC                                         PENTACHLOROPHENOL                                     Date: 08/19/97  
Route: DOSED FEED                                                                                                 Time: 11:06:29  
                                                                                                                                    
 _____________________________________________________________________________________________________________________              
                                           | 7| 6| 6| 7| 7| 5| 7| 7| 7| 5| 7| 7| 7| 7| 6| 7| 7| 7| 7| 7| 7| 7| 4| 6| 5|             
                             DAY ON TEST   | 0| 6| 9| 3| 3| 4| 3| 3| 3| 2| 3| 1| 4| 3| 4| 3| 4| 4| 0| 4| 3| 3| 6| 9| 7|             
                                           | 4| 3| 6| 8| 9| 4| 9| 9| 9| 3| 8| 5| 0| 8| 5| 9| 0| 0| 5| 0| 8| 9| 1| 8| 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| 3| 3| 3|             
    0 PPM                                  | 7| 7| 7| 7| 7| 8| 8| 8| 8| 8| 8| 8| 8| 9| 9| 9| 9| 9| 9| 9| 9| 9| 0| 0| 0|             
                                           | 1| 2| 3| 7| 9| 1| 2| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 0| 1| 2|             
 _____________________________________________________________________________________________________________________|             
 ENDOCRINE SYSTEM - cont                   |                                                                          |             
                                           |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Adrenal Cortex                          | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Accessory Adrenal Cortical Nodule    |                                                                          |             
      Atrophy                              |                                                       3                  |             
      Degeneration, Fatty                  |       3     2           1                 1                          2   |             
      Hyperplasia                          |             2     3                                2     1           1   |             
      Hypertrophy                          |                         1                                                |             
      Pigmentation                         |                                                       3                  |             
                                            __________________________________________________________________________|             
   Adrenal Medulla                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Hyperplasia                          |                         2                                                |             
                                            __________________________________________________________________________|             
   Islets, Pancreatic                      | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Parathyroid Gland                       | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  M  +  +  +  +  M  +  +  +  +|             
      Hyperplasia                          | 2                                                                        |             
                                            __________________________________________________________________________|             
   Pituitary Gland                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Necrosis                             |                                                       3                  |             
      Pars Distalis, Cyst                  | 2  2     3  2     2  1        2     2  2  1        1     1  1  2        2|             
      Pars Distalis, Hemorrhage            |                                                                          |             
      Pars Distalis, Hyperplasia           | 2     3  2  2  2  2           1     3              1     2              2|             
      Pars Intermedia, Cyst                |                                                                          |             
                                            __________________________________________________________________________|             
   Thyroid Gland                           | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      C-Cell, Hyperplasia                  |       1     1                    1     1        1     1                  |             
      Follicular Cell, Hyperplasia, Cystic |                                                                          |             
 _____________________________________________________________________________________________________________________|             
 GENERAL BODY SYSTEM                       |                                                                          |             
                                           |                                                                          |             
    None                                   |                                                                          |             
 _____________________________________________________________________________________________________________________|             
 GENITAL SYSTEM                            |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Clitoral Gland                          | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Hyperplasia                          |    2              4     2  2  2  3                          3        2   |             
      Inflammation, Chronic Active         |                1                                            3            |             
      Duct, Cyst                           |                                                                          |             
                                            __________________________________________________________________________|             
   Ovary                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Cyst                                 |          3                                                              3|             
      Bilateral, Cyst                      |                                     4                                    |             
                                            __________________________________________________________________________|             
   Uterus                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Vagina                                  |       +           +                                                      |             
      Hypertrophy                          |       3                                                                  |             
 _____________________________________________________________________________________________________________________|             
 HEMATOPOIETIC SYSTEM                      |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Bone Marrow                             | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Hyperplasia                          | 3  4  4                 4        4        4              3  3           4|             
      Myelofibrosis                        |                                                       2                  |             
                                            __________________________________________________________________________|             
   Lymph Node                              | +  +  +  +  +     +     +     +  +  +  +  +  +  +     +     +  +        +|             
      Mediastinal, Pigmentation,           |                                                                          |             
 _____________________________________________________________________________________________________________________|             

                                                             Page   3                                                               
NTP Experiment-Test: 89002-02                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09
Study Type: CHRONIC                                         PENTACHLOROPHENOL                                     Date: 08/19/97  
Route: DOSED FEED                                                                                                 Time: 11:06:29  
                                                                                                                                    
 _____________________________________________________________________________________________________________________              
                                           | 7| 6| 6| 7| 7| 5| 7| 7| 7| 5| 7| 7| 7| 7| 6| 7| 7| 7| 7| 7| 7| 7| 4| 6| 5|             
                             DAY ON TEST   | 0| 6| 9| 3| 3| 4| 3| 3| 3| 2| 3| 1| 4| 3| 4| 3| 4| 4| 0| 4| 3| 3| 6| 9| 7|             
                                           | 4| 3| 6| 8| 9| 4| 9| 9| 9| 3| 8| 5| 0| 8| 5| 9| 0| 0| 5| 0| 8| 9| 1| 8| 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| 3| 3| 3|             
    0 PPM                                  | 7| 7| 7| 7| 7| 8| 8| 8| 8| 8| 8| 8| 8| 9| 9| 9| 9| 9| 9| 9| 9| 9| 0| 0| 0|             
                                           | 1| 2| 3| 7| 9| 1| 2| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 0| 1| 2|             
 _____________________________________________________________________________________________________________________|             
 HEMATOPOIETIC SYSTEM - cont               |                                                                          |             
                                           |                                                                          |             
          Hemosiderin                      | 1  1  2  1  1     1           1  2  2  1  1  2  2           2  1         |             
                                            __________________________________________________________________________|             
   Lymph Node, Mandibular                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Ectasia                              |                                                                      2   |             
                                            __________________________________________________________________________|             
   Lymph Node, Mesenteric                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Spleen                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Fibrosis                             |       2                                                                  |             
      Hematopoietic Cell Proliferation     |                                  2                       1  1            |             
      Necrosis                             |                                                                         1|             
                                            __________________________________________________________________________|             
   Thymus                                  | +  +  +  +  +  +  +  +  +  +  +  +  M  +  +  +  +  +  +  +  +  +  +  +  +|             
 _____________________________________________________________________________________________________________________|             
 INTEGUMENTARY SYSTEM                      |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Mammary Gland                           | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Cyst                                 |          4                                                               |             
      Hyperplasia, Cystic                  | 1     3  3  4  2  2  3  2  2  2  2  2  3  4     2        2     2  1  2  2|             
                                            __________________________________________________________________________|             
   Skin                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Epidermis, Hyperplasia               |                                                             2            |             
 _____________________________________________________________________________________________________________________|             
 MUSCULOSKELETAL SYSTEM                    |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Bone                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Osteopetrosis                        | 2           3                       3                 3              3   |             
 _____________________________________________________________________________________________________________________|             
 NERVOUS SYSTEM                            |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Brain                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
 _____________________________________________________________________________________________________________________|             
 RESPIRATORY SYSTEM                        |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Lung                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Inflammation, Chronic Active         |                      1     1              1  1     1                 1   |             
      Alveolar Epithelium, Hyperplasia     |          3                             2  3        3        1            |             
      Alveolus, Infiltration Cellular,     |                                                                          |             
           Histiocyte                      | 1  1     1  2  1  1  2  2  1  1     1  1  1  1  1  1  1  1  1  1  1      |             
                                            __________________________________________________________________________|             
   Nose                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Fungus                               |                      X                                            X  X   |             
      Inflammation, Chronic Active         |          1  2        2              2                             3  3   |             
      Nasolacrimal Duct, Inflammation,     |                                                                          |             
           Suppurative                     |       2                    3     1                                       |             
      Respiratory Epithelium, Hyperplasia  |          2           3              3                             2  3   |             
      Respiratory Epithelium, Metaplasia,  |                                                                          |             
           Squamous                        |                                                                          |             
                                            __________________________________________________________________________|             
   Trachea                                 | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
 _____________________________________________________________________________________________________________________|             
 SPECIAL SENSES SYSTEM                     |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Eye                                     |                                                                      +   |             
      Atrophy                              |                                                                          |             
 _____________________________________________________________________________________________________________________|             
 URINARY SYSTEM                            |                                                                          |             
 _____________________________________________________________________________________________________________________|             

                                                             Page   4                                                               
NTP Experiment-Test: 89002-02                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09
Study Type: CHRONIC                                         PENTACHLOROPHENOL                                     Date: 08/19/97  
Route: DOSED FEED                                                                                                 Time: 11:06:29  
                                                                                                                                    
 _____________________________________________________________________________________________________________________              
                                           | 7| 6| 6| 7| 7| 5| 7| 7| 7| 5| 7| 7| 7| 7| 6| 7| 7| 7| 7| 7| 7| 7| 4| 6| 5|             
                             DAY ON TEST   | 0| 6| 9| 3| 3| 4| 3| 3| 3| 2| 3| 1| 4| 3| 4| 3| 4| 4| 0| 4| 3| 3| 6| 9| 7|             
                                           | 4| 3| 6| 8| 9| 4| 9| 9| 9| 3| 8| 5| 0| 8| 5| 9| 0| 0| 5| 0| 8| 9| 1| 8| 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| 3| 3| 3|             
    0 PPM                                  | 7| 7| 7| 7| 7| 8| 8| 8| 8| 8| 8| 8| 8| 9| 9| 9| 9| 9| 9| 9| 9| 9| 0| 0| 0|             
                                           | 1| 2| 3| 7| 9| 1| 2| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 0| 1| 2|             
 _____________________________________________________________________________________________________________________|             
 URINARY SYSTEM - cont                     |                                                                          |             
                                           |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Kidney                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Cyst                                 |                                                                          |             
      Nephropathy, Chronic                 | 1  1  1  2  2  1  1  2  1  1  2  1  1  1  1  1  1  1  1  1  2  2     2   |             
      Renal Tubule, Pigmentation           | 1  1  3  1  1  1  1  1  2  1  1  1  1  1  1  1  1  1  1  1  1  2  1  1   |             
                                            __________________________________________________________________________|             
   Urinary Bladder                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
 _____________________________________________________________________________________________________________________|             

                                                             Page   5                                                               
NTP Experiment-Test: 89002-02                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09
Study Type: CHRONIC                                         PENTACHLOROPHENOL                                     Date: 08/19/97  
Route: DOSED FEED                                                                                                 Time: 11:06:29  
                                                                                                                                    
 __________________________________________________________________________________________________________________________________ 
                                           | 3| 7| 6| 7| 7| 5| 4| 5| 5| 7| 7| 7| 6| 7| 7| 7| 6| 7| 7| 7| 7| 7| 5| 7| 6|            |
                             DAY ON TEST   | 9| 3| 4| 3| 4| 6| 7| 0| 8| 4| 3| 3| 9| 3| 3| 3| 2| 4| 3| 3| 3| 4| 4| 3| 6|            |
                                           | 1| 9| 8| 8| 0| 9| 5| 7| 5| 0| 8| 8| 8| 9| 8| 9| 0| 0| 8| 9| 1| 0| 3| 8| 3|      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     |
    0 PPM                                  | 0| 0| 0| 0| 0| 0| 0| 1| 1| 1| 1| 1| 1| 1| 1| 1| 2| 2| 2| 2| 2| 2| 2| 2| 3|      L     |
                                           | 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 6| 7| 8| 9| 1| 3| 4| 5| 6| 7| 8| 9| 0|            |
 __________________________________________________________________________________________________________________________________ 
 ALIMENTARY SYSTEM                         |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Esophagus                               | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
                                            __________________________________________________________________________|____________|
   Intestine Large, Colon                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Inflammation, Suppurative            |                                                          2               |      1  2.0|
                                            __________________________________________________________________________|____________|
   Intestine Large, Rectum                 | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Parasite Metazoan                    |                            X                                             |      2     |
                                            __________________________________________________________________________|____________|
   Intestine Large, Cecum                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
                                            __________________________________________________________________________|____________|
   Intestine Small, Duodenum               | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
                                            __________________________________________________________________________|____________|
   Intestine Small, Jejunum                | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
                                            __________________________________________________________________________|____________|
   Intestine Small, Ileum                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Parasite Metazoan                    |                                                                          |      1     |
                                            __________________________________________________________________________|____________|
   Liver                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Basophilic Focus                     | X  X  X  X  X  X     X  X  X  X  X     X  X  X  X  X     X  X  X  X  X   |     41     |
      Clear Cell Focus                     |             X                             X        X                 X   |     11     |
      Eosinophilic Focus                   |                                                 X                        |      2     |
      Hepatodiaphragmatic Nodule           |       X           X     X                             X  X     X         |      9     |
      Inflammation, Chronic                |    1  2     1  1     1  2  1  1        1  1  1  1  1        3  1     1  1|     31  1.3|
      Mixed Cell Focus                     |                                        X           X     X               |      7     |
      Pigmentation, Hemosiderin            |                                                                          |      1  2.0|
      Thrombosis                           | 2                                                                        |      2  2.0|
      Bile Duct, Hyperplasia               |          1  1           1  1  1  1  2  1  1              1               |     24  1.2|
      Hepatocyte, Vacuolization Cytoplasmic|                                                    1        3            |      7  1.9|
      Hepatocyte, Centrilobular, Necrosis  | 2              2                                                         |      2  2.0|
                                            __________________________________________________________________________|____________|
   Mesentery                               | +  +              +                 +                    +               |   8        |
      Accessory Spleen                     |                                                          X               |      1     |
      Artery, Inflammation, Chronic Active |    3                                                                     |      1  3.0|
      Fat, Necrosis                        | 4                                                                        |      3  4.0|
                                            __________________________________________________________________________|____________|
   Oral Mucosa                             |                                                                          |   1        |
                                            __________________________________________________________________________|____________|
   Pancreas                                | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Acinus, Atrophy                      |       1                 1                             1        2         |     10  1.3|
                                            __________________________________________________________________________|____________|
   Salivary Glands                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
                                            __________________________________________________________________________|____________|
   Stomach, Forestomach                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Inflammation, Chronic Active         |                                                             2            |      1  2.0|
      Epithelium, Hyperplasia              |                                                             3     2      |      3  2.3|
      Epithelium, Ulcer                    |                   4                                         4            |      2  4.0|
                                            __________________________________________________________________________|____________|
   Stomach, Glandular                      | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Epithelium, Erosion                  |                                                                          |      1  2.0|
                                            __________________________________________________________________________|____________|
   Tongue                                  |                                                                          |   1        |
 _____________________________________________________________________________________________________________________|            |
 CARDIOVASCULAR 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   6                                                               
NTP Experiment-Test: 89002-02                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09
Study Type: CHRONIC                                         PENTACHLOROPHENOL                                     Date: 08/19/97  
Route: DOSED FEED                                                                                                 Time: 11:06:29  
                                                                                                                                    
 __________________________________________________________________________________________________________________________________ 
                                           | 3| 7| 6| 7| 7| 5| 4| 5| 5| 7| 7| 7| 6| 7| 7| 7| 6| 7| 7| 7| 7| 7| 5| 7| 6|            |
                             DAY ON TEST   | 9| 3| 4| 3| 4| 6| 7| 0| 8| 4| 3| 3| 9| 3| 3| 3| 2| 4| 3| 3| 3| 4| 4| 3| 6|            |
                                           | 1| 9| 8| 8| 0| 9| 5| 7| 5| 0| 8| 8| 8| 9| 8| 9| 0| 0| 8| 9| 1| 0| 3| 8| 3|      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     |
    0 PPM                                  | 0| 0| 0| 0| 0| 0| 0| 1| 1| 1| 1| 1| 1| 1| 1| 1| 2| 2| 2| 2| 2| 2| 2| 2| 3|      L     |
                                           | 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 6| 7| 8| 9| 1| 3| 4| 5| 6| 7| 8| 9| 0|            |
 __________________________________________________________________________________________________________________________________ 
 CARDIOVASCULAR SYSTEM - cont              |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Blood Vessel                            | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Aorta, Inflammation, Chronic Active  |    3                                                                     |      1  3.0|
                                            __________________________________________________________________________|____________|
   Heart                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Cardiomyopathy, Chronic              |       1     1        1  2  2  1  1           1     2                 1  1|     27  1.1|
 _____________________________________________________________________________________________________________________|            |
 ENDOCRINE SYSTEM                          |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Adrenal Cortex                          | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Accessory Adrenal Cortical Nodule    |                                                                      2   |      1  2.0|
      Atrophy                              |                                                                          |      1  3.0|
      Degeneration, Fatty                  |          1              1           2                          1         |      9  1.6|
      Hyperplasia                          |                                              1                 2         |      7  1.7|
      Hypertrophy                          |                                                                          |      1  1.0|
      Pigmentation                         |                                                                          |      1  3.0|
                                            __________________________________________________________________________|____________|
   Adrenal Medulla                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Hyperplasia                          |             2                 2                                          |      3  2.0|
                                            __________________________________________________________________________|____________|
   Islets, Pancreatic                      | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
                                            __________________________________________________________________________|____________|
   Parathyroid Gland                       | M  +  +  +  +  +  +  +  +  +  +  +  +  +  M  +  +  +  +  +  +  +  +  +  +|  46        |
      Hyperplasia                          |                                                                          |      1  2.0|
                                            __________________________________________________________________________|____________|
   Pituitary Gland                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Necrosis                             |                                                                          |      1  3.0|
      Pars Distalis, Cyst                  |    2  3  2  1  2  1  1  1  2  2  2     2  2  3     3        2  2  2  2  2|     35  1.9|
      Pars Distalis, Hemorrhage            |                                                       4                  |      1  4.0|
      Pars Distalis, Hyperplasia           |    2     1     2  2        2  2  2  2     2        2     2     2  2      |     24  2.0|
      Pars Intermedia, Cyst                |                                     1                                    |      1  1.0|
                                            __________________________________________________________________________|____________|
   Thyroid Gland                           | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      C-Cell, Hyperplasia                  |    1     1  1              1        2           1  1        1        1  1|     16  1.1|
      Follicular Cell, Hyperplasia, Cystic |                                                                   2      |      1  2.0|
 _____________________________________________________________________________________________________________________|            |
 GENERAL BODY SYSTEM                       |                                                                          |            |
                                           |                                                                          |            |
    None                                   |                                                                          |            |
 _____________________________________________________________________________________________________________________|            |
 GENITAL SYSTEM                            |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Clitoral Gland                          | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Hyperplasia                          |                            2  4                                          |     10  2.6|
      Inflammation, Chronic Active         |                         1                                               1|      4  1.5|
      Duct, Cyst                           |                                                          2               |      1  2.0|
                                            __________________________________________________________________________|____________|
   Ovary                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Cyst                                 |                            3                                             |      3  3.0|
      Bilateral, Cyst                      |                                                                          |      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   7                                                               
NTP Experiment-Test: 89002-02                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09
Study Type: CHRONIC                                         PENTACHLOROPHENOL                                     Date: 08/19/97  
Route: DOSED FEED                                                                                                 Time: 11:06:29  
                                                                                                                                    
 __________________________________________________________________________________________________________________________________ 
                                           | 3| 7| 6| 7| 7| 5| 4| 5| 5| 7| 7| 7| 6| 7| 7| 7| 6| 7| 7| 7| 7| 7| 5| 7| 6|            |
                             DAY ON TEST   | 9| 3| 4| 3| 4| 6| 7| 0| 8| 4| 3| 3| 9| 3| 3| 3| 2| 4| 3| 3| 3| 4| 4| 3| 6|            |
                                           | 1| 9| 8| 8| 0| 9| 5| 7| 5| 0| 8| 8| 8| 9| 8| 9| 0| 0| 8| 9| 1| 0| 3| 8| 3|      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     |
    0 PPM                                  | 0| 0| 0| 0| 0| 0| 0| 1| 1| 1| 1| 1| 1| 1| 1| 1| 2| 2| 2| 2| 2| 2| 2| 2| 3|      L     |
                                           | 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 6| 7| 8| 9| 1| 3| 4| 5| 6| 7| 8| 9| 0|            |
 __________________________________________________________________________________________________________________________________ 
 GENITAL SYSTEM - cont                     |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Uterus                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
                                            __________________________________________________________________________|____________|
   Vagina                                  |                                                                          |   2        |
      Hypertrophy                          |                                                                          |      1  3.0|
 _____________________________________________________________________________________________________________________|            |
 HEMATOPOIETIC SYSTEM                      |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Bone Marrow                             | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Hyperplasia                          |                   4                 4                                    |     11  3.7|
      Myelofibrosis                        |                                                                          |      1  2.0|
                                            __________________________________________________________________________|____________|
   Lymph Node                              |    +  +  +  +  +  +  +  +  +        +  +     +  +     +        +  +     +|  35        |
      Mediastinal, Pigmentation,           |                                                                          |            |
          Hemosiderin                      |    2  1  2  2  1     2  1  1           1     1  2     2        2  1     1|     30  1.4|
                                            __________________________________________________________________________|____________|
   Lymph Node, Mandibular                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Ectasia                              |                                                                          |      1  2.0|
                                            __________________________________________________________________________|____________|
   Lymph Node, Mesenteric                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
                                            __________________________________________________________________________|____________|
   Spleen                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Fibrosis                             |                                                                          |      1  2.0|
      Hematopoietic Cell Proliferation     | 1  1           3                       1                 1  1            |      9  1.3|
      Necrosis                             |                                                                          |      1  1.0|
                                            __________________________________________________________________________|____________|
   Thymus                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  M  +  +  +  +  +|  48        |
 _____________________________________________________________________________________________________________________|            |
 INTEGUMENTARY SYSTEM                      |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Mammary Gland                           | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Cyst                                 |                                                                      4   |      2  4.0|
      Hyperplasia, Cystic                  |    2  2  2  2  4  2  1  2  3  2  2  2  2  1  2  2  2  3  3  3  2  1     2|     43  2.2|
                                            __________________________________________________________________________|____________|
   Skin                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Epidermis, Hyperplasia               |                                                                          |      1  2.0|
 _____________________________________________________________________________________________________________________|            |
 MUSCULOSKELETAL SYSTEM                    |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Bone                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Osteopetrosis                        |                                                          3               |      6  2.8|
 _____________________________________________________________________________________________________________________|            |
 NERVOUS SYSTEM                            |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Brain                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
 _____________________________________________________________________________________________________________________|            |
 RESPIRATORY SYSTEM                        |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Lung                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Inflammation, Chronic Active         |       1                 1  1  1                    1     1               |     12  1.0|
      Alveolar Epithelium, Hyperplasia     |                                                                          |      5  2.4|
      Alveolus, Infiltration Cellular,     |                                                                          |            |
 __________________________________________________________________________________________________________________________________ 

  * : 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: 89002-02                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09
Study Type: CHRONIC                                         PENTACHLOROPHENOL                                     Date: 08/19/97  
Route: DOSED FEED                                                                                                 Time: 11:06:29  
                                                                                                                                    
 __________________________________________________________________________________________________________________________________ 
                                           | 3| 7| 6| 7| 7| 5| 4| 5| 5| 7| 7| 7| 6| 7| 7| 7| 6| 7| 7| 7| 7| 7| 5| 7| 6|            |
                             DAY ON TEST   | 9| 3| 4| 3| 4| 6| 7| 0| 8| 4| 3| 3| 9| 3| 3| 3| 2| 4| 3| 3| 3| 4| 4| 3| 6|            |
                                           | 1| 9| 8| 8| 0| 9| 5| 7| 5| 0| 8| 8| 8| 9| 8| 9| 0| 0| 8| 9| 1| 0| 3| 8| 3|      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     |
    0 PPM                                  | 0| 0| 0| 0| 0| 0| 0| 1| 1| 1| 1| 1| 1| 1| 1| 1| 2| 2| 2| 2| 2| 2| 2| 2| 3|      L     |
                                           | 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 6| 7| 8| 9| 1| 3| 4| 5| 6| 7| 8| 9| 0|            |
 __________________________________________________________________________________________________________________________________ 
 RESPIRATORY SYSTEM - cont                 |                                                                          |            |
                                           |                                                                          |            |
           Histiocyte                      |    1  1  1  1  1        1  1  1  1     1  1  1  1  2  1  1  1  1     1  1|     41  1.1|
                                            __________________________________________________________________________|____________|
   Nose                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Fungus                               |                X                                            X     X      |      6     |
      Inflammation, Chronic Active         |    2  1        3           2  1                             2     2      |     13  2.0|
      Nasolacrimal Duct, Inflammation,     |                                                                          |            |
           Suppurative                     |                         3  2     1     1     1                 2         |      9  1.8|
      Respiratory Epithelium, Hyperplasia  |    2           3           3                                2     2      |     10  2.5|
      Respiratory Epithelium, Metaplasia,  |                                                                          |            |
           Squamous                        |    2                                                        3     3      |      3  2.7|
                                            __________________________________________________________________________|____________|
   Trachea                                 | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
 _____________________________________________________________________________________________________________________|            |
 SPECIAL SENSES SYSTEM                     |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Eye                                     |                               +           +                              |   3        |
      Atrophy                              |                               4           4                              |      2  4.0|
 _____________________________________________________________________________________________________________________|            |
 URINARY SYSTEM                            |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Kidney                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Cyst                                 |                            3                                             |      1  3.0|
      Nephropathy, Chronic                 |    1  1  2  2        1  2  1  1  1  1  1  1  1  1  2  1  1  2  1     1  1|     44  1.3|
      Renal Tubule, Pigmentation           | 1  1  1  1  1  1  1     1  1  1  1  1  1  1  1  1  1  2  1  1  1  1  2  1|     48  1.1|
                                            __________________________________________________________________________|____________|
   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   9                                                               
NTP Experiment-Test: 89002-02                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09
Study Type: CHRONIC                                         PENTACHLOROPHENOL                                     Date: 08/19/97  
Route: DOSED FEED                                                                                                 Time: 11:06:29  
                                                                                                                                    
 _____________________________________________________________________________________________________________________              
                                           | 7| 7| 7| 7| 7| 7| 2| 7| 5| 7| 6| 6| 7| 7| 7| 7| 7| 7| 6| 5| 7| 7| 7| 7| 7|             
                             DAY ON TEST   | 2| 3| 0| 3| 3| 3| 8| 3| 2| 3| 2| 9| 3| 3| 3| 4| 3| 3| 2| 3| 4| 3| 4| 3| 3|             
                                           | 6| 9| 0| 1| 8| 8| 4| 8| 2| 8| 0| 8| 9| 8| 9| 0| 8| 9| 0| 5| 0| 9| 0| 9| 8|             
 _____________________________________________________________________________________________________________________|             
                                           | 0| 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|             
    200 PPM                                | 3| 3| 3| 3| 3| 3| 3| 3| 3| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 5| 5| 5| 5| 5| 5|             
                                           | 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                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Parasite Metazoan                    |                            X                    X                        |             
                                            __________________________________________________________________________|             
   Intestine Large, Rectum                 | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Parasite Metazoan                    |                      X                       X                           |             
                                            __________________________________________________________________________|             
   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  X  X  X|             
      Clear Cell Focus                     |                X     X     X        X                                    |             
      Eosinophilic Focus                   |                                                                          |             
      Hepatodiaphragmatic Nodule           |                                                    X                     |             
      Inflammation, Chronic                |    1     2  2  1  1  1  1  2        1  2  2     2  2  2  1  1  2  2     1|             
      Mixed Cell Focus                     |                            X                                      X     X|             
      Pigmentation, Bile                   |                               2                                          |             
      Thrombosis                           |                                  4                                       |             
      Bile Duct, Cyst                      |                                                                          |             
      Bile Duct, Hyperplasia               | 2  1        1                    1           1        1  1     1     1   |             
      Hepatocyte, Necrosis                 |                                                                          |             
      Hepatocyte, Vacuolization Cytoplasmic|                                                          2               |             
                                            __________________________________________________________________________|             
   Mesentery                               |                                                                          |             
      Accessory Spleen                     |                                                                          |             
                                            __________________________________________________________________________|             
   Pancreas                                | +  +  A  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Acinus, Atrophy                      |                                  1  3           1           1        1  2|             
                                            __________________________________________________________________________|             
   Salivary Glands                         | +  +  +  M  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Stomach, Forestomach                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Epithelium, Hyperplasia              |                               2                                          |             
                                            __________________________________________________________________________|             
   Stomach, Glandular                      | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Epithelium, Erosion                  |                               4  3                                       |             
 _____________________________________________________________________________________________________________________|             
 CARDIOVASCULAR SYSTEM                     |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Blood Vessel                            | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Heart                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Cardiomyopathy, Chronic              | 2  2  2     1  1  1  2  1     1           1        2  1  1  1  1     1   |             
      Atrium, Thrombosis                   |                               3                                          |             
 _____________________________________________________________________________________________________________________|             
 ENDOCRINE SYSTEM                          |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Adrenal Cortex                          | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Accessory Adrenal Cortical Nodule    |                                                                          |             
      Atrophy                              |                                                                          |             
      Degeneration, Cystic                 |                                           3                              |             
      Degeneration, Fatty                  |             1                 3        1     1                 1     2   |             
 _____________________________________________________________________________________________________________________|             

                                                             Page  10                                                               
NTP Experiment-Test: 89002-02                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09
Study Type: CHRONIC                                         PENTACHLOROPHENOL                                     Date: 08/19/97  
Route: DOSED FEED                                                                                                 Time: 11:06:29  
                                                                                                                                    
 _____________________________________________________________________________________________________________________              
                                           | 7| 7| 7| 7| 7| 7| 2| 7| 5| 7| 6| 6| 7| 7| 7| 7| 7| 7| 6| 5| 7| 7| 7| 7| 7|             
                             DAY ON TEST   | 2| 3| 0| 3| 3| 3| 8| 3| 2| 3| 2| 9| 3| 3| 3| 4| 3| 3| 2| 3| 4| 3| 4| 3| 3|             
                                           | 6| 9| 0| 1| 8| 8| 4| 8| 2| 8| 0| 8| 9| 8| 9| 0| 8| 9| 0| 5| 0| 9| 0| 9| 8|             
 _____________________________________________________________________________________________________________________|             
                                           | 0| 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|             
    200 PPM                                | 3| 3| 3| 3| 3| 3| 3| 3| 3| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 5| 5| 5| 5| 5| 5|             
                                           | 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                   |                                                                          |             
                                           |                                                                          |             
      Hyperplasia                          |             1                          1  1  1                 2  1      |             
      Hypertrophy                          |                                           3                          2   |             
                                            __________________________________________________________________________|             
   Adrenal Medulla                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Hyperplasia                          |                                  2                                      1|             
                                            __________________________________________________________________________|             
   Islets, Pancreatic                      | +  +  M  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Parathyroid Gland                       | +  +  +  +  +  +  +  +  +  M  +  +  +  +  +  +  +  +  +  +  +  +  +  +  M|             
                                            __________________________________________________________________________|             
   Pituitary Gland                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Hemorrhage                           |                                                                          |             
      Pars Distalis, Cyst                  | 2     2              4     3  2  2  2  3  2     3  1           2         |             
      Pars Distalis, Hyperplasia           | 2                          2  1     2  2        4     2     3  3         |             
      Pars Intermedia, Cyst                |                                        2                                 |             
                                            __________________________________________________________________________|             
   Thyroid Gland                           | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      C-Cell, Hyperplasia                  |    1     1  2  1     1     1        1  1  1     1  1     1     2  1  1   |             
 _____________________________________________________________________________________________________________________|             
 GENERAL BODY SYSTEM                       |                                                                          |             
                                           |                                                                          |             
    None                                   |                                                                          |             
 _____________________________________________________________________________________________________________________|             
 GENITAL SYSTEM                            |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Clitoral Gland                          | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Hyperplasia                          |    4           2                          2     4                        |             
      Inflammation, Chronic Active         |                                     2     2     1     1  1               |             
      Bilateral, Hyperplasia               |                                                    3                     |             
                                            __________________________________________________________________________|             
   Ovary                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Cyst                                 |                                           4              4  4            |             
                                            __________________________________________________________________________|             
   Uterus                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Hydrometra                           |                                                                          |             
      Endometrium, Hyperplasia, Cystic     |                                                                          |             
 _____________________________________________________________________________________________________________________|             
 HEMATOPOIETIC SYSTEM                      |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Bone Marrow                             | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Hyperplasia, Histiocytic             |                                  2                                       |             
      Hyperplasia                          | 4     4                       4                 3  3           3     4   |             
      Myelofibrosis                        |                                  2                                       |             
                                            __________________________________________________________________________|             
   Lymph Node                              | +  +  +     +  +     +     +     +  +  +     +  +     +  +           +   |             
      Mediastinal, Pigmentation,           |                                                                          |             
          Hemosiderin                      | 1  2        1  2     1     2     1     2     2  1     1  1           2   |             
                                            __________________________________________________________________________|             
   Lymph Node, Mandibular                  | +  +  +  M  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Lymph Node, Mesenteric                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Spleen                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Hematopoietic Cell Proliferation     |                      1     1                    2  1     1  1  1         |             
      Pigmentation, Hemosiderin            |                                                                          |             
                                            __________________________________________________________________________|             
   Thymus                                  | +  +  +  +  +  M  +  +  +  +  M  +  +  +  +  +  M  +  +  +  +  +  +  +  +|             
      Cyst                                 |                                                                          |             
 _____________________________________________________________________________________________________________________|             
 INTEGUMENTARY SYSTEM                      |                                                                          |             
 _____________________________________________________________________________________________________________________|             

                                                             Page  11                                                               
NTP Experiment-Test: 89002-02                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09
Study Type: CHRONIC                                         PENTACHLOROPHENOL                                     Date: 08/19/97  
Route: DOSED FEED                                                                                                 Time: 11:06:29  
                                                                                                                                    
 _____________________________________________________________________________________________________________________              
                                           | 7| 7| 7| 7| 7| 7| 2| 7| 5| 7| 6| 6| 7| 7| 7| 7| 7| 7| 6| 5| 7| 7| 7| 7| 7|             
                             DAY ON TEST   | 2| 3| 0| 3| 3| 3| 8| 3| 2| 3| 2| 9| 3| 3| 3| 4| 3| 3| 2| 3| 4| 3| 4| 3| 3|             
                                           | 6| 9| 0| 1| 8| 8| 4| 8| 2| 8| 0| 8| 9| 8| 9| 0| 8| 9| 0| 5| 0| 9| 0| 9| 8|             
 _____________________________________________________________________________________________________________________|             
                                           | 0| 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|             
    200 PPM                                | 3| 3| 3| 3| 3| 3| 3| 3| 3| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 5| 5| 5| 5| 5| 5|             
                                           | 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               |                                                                          |             
                                           |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Mammary Gland                           | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Cyst                                 |    3     4                                                               |             
      Hyperplasia, Cystic                  | 2  2     4  4  2     2  4  2  2  2  2  1  2  2  3  2  2  3  2  2  2  2  2|             
                                            __________________________________________________________________________|             
   Skin                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
 _____________________________________________________________________________________________________________________|             
 MUSCULOSKELETAL SYSTEM                    |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Bone                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Osteopetrosis                        |                                  2                                       |             
      Mandible, Cyst                       |                   3                                                      |             
 _____________________________________________________________________________________________________________________|             
 NERVOUS SYSTEM                            |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Brain                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Gliosis                              |                                                                          |             
      Hemorrhage                           |                                                                          |             
 _____________________________________________________________________________________________________________________|             
 RESPIRATORY SYSTEM                        |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Lung                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Inflammation, Chronic Active         |                      1  1                       1     1                  |             
      Metaplasia, Osseous                  |                                                                          |             
      Alveolar Epithelium, Hyperplasia     |          2                                                               |             
      Alveolus, Infiltration Cellular,     |                                                                          |             
           Histiocyte                      |    1     1  1  1     1  1  1  1  1  1  2  1  1  1  1  1  1  1  1  1  1  1|             
                                            __________________________________________________________________________|             
   Nose                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Fungus                               |       X                                                                  |             
      Inflammation, Chronic Active         | 1     2                    1           2  1     1  1  1  1  1            |             
      Nasolacrimal Duct, Inflammation,     |                                                                          |             
           Suppurative                     |    3                                      1                       1      |             
      Respiratory Epithelium, Hyperplasia  |       2                                2           2                     |             
      Respiratory Epithelium, Metaplasia,  |                                                                          |             
           Squamous                        |       2                                2           2                     |             
                                            __________________________________________________________________________|             
   Trachea                                 | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
 _____________________________________________________________________________________________________________________|             
 SPECIAL SENSES SYSTEM                     |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Eye                                     |                                  +                                +      |             
      Lens, Cataract                       |                                                                   4      |             
      Lens, Fibrosis                       |                                  3                                       |             
      Lens, Synechia                       |                                  4                                       |             
      Retina, Atrophy                      |                                  4                                4      |             
                                            __________________________________________________________________________|             
   Zymbal's Gland                          |                                                                         +|             
 _____________________________________________________________________________________________________________________|             
 URINARY SYSTEM                            |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Kidney                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Mineralization                       |                                                                          |             
 _____________________________________________________________________________________________________________________|             

                                                             Page  12                                                               
NTP Experiment-Test: 89002-02                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09
Study Type: CHRONIC                                         PENTACHLOROPHENOL                                     Date: 08/19/97  
Route: DOSED FEED                                                                                                 Time: 11:06:29  
                                                                                                                                    
 _____________________________________________________________________________________________________________________              
                                           | 7| 7| 7| 7| 7| 7| 2| 7| 5| 7| 6| 6| 7| 7| 7| 7| 7| 7| 6| 5| 7| 7| 7| 7| 7|             
                             DAY ON TEST   | 2| 3| 0| 3| 3| 3| 8| 3| 2| 3| 2| 9| 3| 3| 3| 4| 3| 3| 2| 3| 4| 3| 4| 3| 3|             
                                           | 6| 9| 0| 1| 8| 8| 4| 8| 2| 8| 0| 8| 9| 8| 9| 0| 8| 9| 0| 5| 0| 9| 0| 9| 8|             
 _____________________________________________________________________________________________________________________|             
                                           | 0| 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|             
    200 PPM                                | 3| 3| 3| 3| 3| 3| 3| 3| 3| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 5| 5| 5| 5| 5| 5|             
                                           | 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                     |                                                                          |             
                                           |                                                                          |             
      Nephropathy, Chronic                 | 1  1  1  2  1  2  1  2  1  1  1  1  1  1  2  1  1  1  1  1  1  1  1  1  1|             
      Papilla, Necrosis                    |                                                                          |             
      Pelvis, Inflammation, Suppurative    |                                                                          |             
      Renal Tubule, Pigmentation           | 1  1  1  1  1  1     1  1  1  1  2  1  1  1  1  1  1  1  1  1  1  1  1  1|             
                                            __________________________________________________________________________|             
   Urinary Bladder                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Calculus Micro Observation Only      |                                                                          |             
      Inflammation, Chronic Active         |                                                                          |             
 _____________________________________________________________________________________________________________________|             

                                                             Page  13                                                               
NTP Experiment-Test: 89002-02                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09
Study Type: CHRONIC                                         PENTACHLOROPHENOL                                     Date: 08/19/97  
Route: DOSED FEED                                                                                                 Time: 11:06:29  
                                                                                                                                    
 __________________________________________________________________________________________________________________________________ 
                                           | 7| 7| 6| 3| 7| 7| 7| 7| 7| 7| 7| 5| 7| 7| 7| 7| 7| 7| 7| 7| 7| 3| 7| 7| 4|            |
                             DAY ON TEST   | 3| 4| 5| 3| 0| 4| 4| 3| 3| 3| 1| 3| 3| 4| 1| 4| 3| 3| 3| 4| 3| 9| 3| 4| 3|            |
                                           | 9| 0| 0| 7| 1| 0| 0| 9| 9| 9| 5| 5| 8| 0| 5| 0| 8| 9| 8| 0| 8| 2| 9| 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 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     |
    200 PPM                                | 5| 5| 5| 5| 6| 6| 6| 6| 6| 6| 6| 6| 6| 6| 7| 7| 7| 7| 7| 7| 7| 7| 7| 7| 8|      L     |
                                           | 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                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Parasite Metazoan                    |                                                                          |      2     |
                                            __________________________________________________________________________|____________|
   Intestine Large, Rectum                 | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Parasite Metazoan                    |                X  X                                      X               |      5     |
                                            __________________________________________________________________________|____________|
   Intestine Large, Cecum                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
                                            __________________________________________________________________________|____________|
   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     X  X   |     42     |
      Clear Cell Focus                     |                            X                 X  X  X  X           X      |     10     |
      Eosinophilic Focus                   |                                     X                                    |      1     |
      Hepatodiaphragmatic Nodule           |          X                                         X           X         |      4     |
      Inflammation, Chronic                | 2  2  1     1  1  1  2  1  1        2  1     2  2  1  1  2  1            |     36  1.5|
      Mixed Cell Focus                     |    X              X                                   X  X               |      7     |
      Pigmentation, Bile                   |                                           1                              |      2  1.5|
      Thrombosis                           |                                                                          |      1  4.0|
      Bile Duct, Cyst                      |                                                          3               |      1  3.0|
      Bile Duct, Hyperplasia               |                1              2  2  1  1  2  1              1           2|     18  1.3|
      Hepatocyte, Necrosis                 |          3                                                               |      1  3.0|
      Hepatocyte, Vacuolization Cytoplasmic|          3                                                               |      2  2.5|
                                            __________________________________________________________________________|____________|
   Mesentery                               |    +                                                                     |   1        |
      Accessory Spleen                     |    X                                                                     |      1     |
                                            __________________________________________________________________________|____________|
   Pancreas                                | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  49        |
      Acinus, Atrophy                      | 2  1                 1  1        2     1                    1     1      |     14  1.4|
                                            __________________________________________________________________________|____________|
   Salivary Glands                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  49        |
                                            __________________________________________________________________________|____________|
   Stomach, Forestomach                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Epithelium, Hyperplasia              |                                                                          |      1  2.0|
                                            __________________________________________________________________________|____________|
   Stomach, Glandular                      | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Epithelium, Erosion                  |                                                                          |      2  3.5|
 _____________________________________________________________________________________________________________________|            |
 CARDIOVASCULAR SYSTEM                     |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Blood Vessel                            | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
                                            __________________________________________________________________________|____________|
   Heart                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Cardiomyopathy, Chronic              |       1        1  2  1  2  2        2  1  1  2  1     1  1        2  2   |     31  1.4|
      Atrium, Thrombosis                   |                                                                          |      1  3.0|
 _____________________________________________________________________________________________________________________|            |
 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  14                                                               
NTP Experiment-Test: 89002-02                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09
Study Type: CHRONIC                                         PENTACHLOROPHENOL                                     Date: 08/19/97  
Route: DOSED FEED                                                                                                 Time: 11:06:29  
                                                                                                                                    
 __________________________________________________________________________________________________________________________________ 
                                           | 7| 7| 6| 3| 7| 7| 7| 7| 7| 7| 7| 5| 7| 7| 7| 7| 7| 7| 7| 7| 7| 3| 7| 7| 4|            |
                             DAY ON TEST   | 3| 4| 5| 3| 0| 4| 4| 3| 3| 3| 1| 3| 3| 4| 1| 4| 3| 3| 3| 4| 3| 9| 3| 4| 3|            |
                                           | 9| 0| 0| 7| 1| 0| 0| 9| 9| 9| 5| 5| 8| 0| 5| 0| 8| 9| 8| 0| 8| 2| 9| 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 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     |
    200 PPM                                | 5| 5| 5| 5| 6| 6| 6| 6| 6| 6| 6| 6| 6| 6| 7| 7| 7| 7| 7| 7| 7| 7| 7| 7| 8|      L     |
                                           | 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    |                            2        1                                    |      2  1.5|
      Atrophy                              |                               2                                          |      1  2.0|
      Degeneration, Cystic                 |    2                 2                 2                                 |      4  2.3|
      Degeneration, Fatty                  |                      1  1           2                    1  1            |     11  1.4|
      Hyperplasia                          | 1  1           1        2  2                          1                  |     12  1.3|
      Hypertrophy                          |    2                 2                 2                 2               |      6  2.2|
                                            __________________________________________________________________________|____________|
   Adrenal Medulla                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Hyperplasia                          |    2           1  2                                                  1  1|      7  1.4|
                                            __________________________________________________________________________|____________|
   Islets, Pancreatic                      | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  49        |
                                            __________________________________________________________________________|____________|
   Parathyroid Gland                       | +  +  +  +  +  +  M  M  +  +  +  +  +  +  +  +  +  +  +  +  +  M  +  +  M|  44        |
                                            __________________________________________________________________________|____________|
   Pituitary Gland                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Hemorrhage                           |                                                                         2|      1  2.0|
      Pars Distalis, Cyst                  | 2  2  2     2  2  2        2  2  3  4  3     3  1  2           4  3      |     28  2.4|
      Pars Distalis, Hyperplasia           | 2  2  2     1     2           3        3     2  2  2  3           4      |     21  2.3|
      Pars Intermedia, Cyst                |                                        3                                 |      2  2.5|
                                            __________________________________________________________________________|____________|
   Thyroid Gland                           | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      C-Cell, Hyperplasia                  | 2     1                    1        2              1              1  2  1|     23  1.2|
 _____________________________________________________________________________________________________________________|            |
 GENERAL BODY SYSTEM                       |                                                                          |            |
                                           |                                                                          |            |
    None                                   |                                                                          |            |
 _____________________________________________________________________________________________________________________|            |
 GENITAL SYSTEM                            |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Clitoral Gland                          | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Hyperplasia                          | 3  2  1           2              3     2                    2            |     11  2.5|
      Inflammation, Chronic Active         | 2     2  2              1        2     2                                 |     11  1.6|
      Bilateral, Hyperplasia               |                                                                          |      1  3.0|
                                            __________________________________________________________________________|____________|
   Ovary                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Cyst                                 |    4                                            3           2            |      6  3.5|
                                            __________________________________________________________________________|____________|
   Uterus                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Hydrometra                           | 4                    4                                                   |      2  4.0|
      Endometrium, Hyperplasia, Cystic     |    4                                                                     |      1  4.0|
 _____________________________________________________________________________________________________________________|            |
 HEMATOPOIETIC SYSTEM                      |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Bone Marrow                             | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Hyperplasia, Histiocytic             |                                                                          |      1  2.0|
      Hyperplasia                          | 3     3                       4  4        4                          4   |     13  3.6|
      Myelofibrosis                        |                                                                          |      1  2.0|
                                            __________________________________________________________________________|____________|
   Lymph Node                              |    +  +  +                    +  +  +     +           +  +     +     +  +|  27        |
 __________________________________________________________________________________________________________________________________ 

  * : 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  15                                                               
NTP Experiment-Test: 89002-02                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09
Study Type: CHRONIC                                         PENTACHLOROPHENOL                                     Date: 08/19/97  
Route: DOSED FEED                                                                                                 Time: 11:06:29  
                                                                                                                                    
 __________________________________________________________________________________________________________________________________ 
                                           | 7| 7| 6| 3| 7| 7| 7| 7| 7| 7| 7| 5| 7| 7| 7| 7| 7| 7| 7| 7| 7| 3| 7| 7| 4|            |
                             DAY ON TEST   | 3| 4| 5| 3| 0| 4| 4| 3| 3| 3| 1| 3| 3| 4| 1| 4| 3| 3| 3| 4| 3| 9| 3| 4| 3|            |
                                           | 9| 0| 0| 7| 1| 0| 0| 9| 9| 9| 5| 5| 8| 0| 5| 0| 8| 9| 8| 0| 8| 2| 9| 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 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     |
    200 PPM                                | 5| 5| 5| 5| 6| 6| 6| 6| 6| 6| 6| 6| 6| 6| 7| 7| 7| 7| 7| 7| 7| 7| 7| 7| 8|      L     |
                                           | 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               |                                                                          |            |
                                           |                                                                          |            |
      Mediastinal, Pigmentation,           |                                                                          |            |
          Hemosiderin                      |    1  1  1                    1     1     1           2  1           1   |     22  1.3|
                                            __________________________________________________________________________|____________|
   Lymph Node, Mandibular                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  49        |
                                            __________________________________________________________________________|____________|
   Lymph Node, Mesenteric                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
                                            __________________________________________________________________________|____________|
   Spleen                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Hematopoietic Cell Proliferation     |             1  1        1                          1              1      |     12  1.1|
      Pigmentation, Hemosiderin            |          3                                                               |      1  3.0|
                                            __________________________________________________________________________|____________|
   Thymus                                  | +  +  M  +  +  +  +  +  +  +  +  +  +  +  M  +  +  +  +  +  +  +  +  +  M|  44        |
      Cyst                                 |                                                                2         |      1  2.0|
 _____________________________________________________________________________________________________________________|            |
 INTEGUMENTARY SYSTEM                      |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Mammary Gland                           | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Cyst                                 |                                                                          |      2  3.5|
      Hyperplasia, Cystic                  | 2  2  3     2  2  2  2  2  2  2  2  3  2     2     2  1  2  2  2  4  2   |     44  2.2|
                                            __________________________________________________________________________|____________|
   Skin                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
 _____________________________________________________________________________________________________________________|            |
 MUSCULOSKELETAL SYSTEM                    |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Bone                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Osteopetrosis                        |                                                                          |      1  2.0|
      Mandible, Cyst                       |                                                                          |      1  3.0|
 _____________________________________________________________________________________________________________________|            |
 NERVOUS SYSTEM                            |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Brain                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Gliosis                              |                                        2                                 |      1  2.0|
      Hemorrhage                           |                                                                3         |      1  3.0|
 _____________________________________________________________________________________________________________________|            |
 RESPIRATORY SYSTEM                        |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Lung                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Inflammation, Chronic Active         |                1  1     1  1           1        1                 1  1   |     12  1.0|
      Metaplasia, Osseous                  |                         1                                                |      1  1.0|
      Alveolar Epithelium, Hyperplasia     |                            2                                             |      2  2.0|
      Alveolus, Infiltration Cellular,     |                                                                          |            |
           Histiocyte                      | 1  1  1     1     1  1  1  1        1  1  1  1  1  1  1  1  1     1  1  1|     42  1.0|
                                            __________________________________________________________________________|____________|
   Nose                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Fungus                               |          X                                                               |      2     |
      Inflammation, Chronic Active         |          2           1                                            1      |     13  1.2|
      Nasolacrimal Duct, Inflammation,     |                                                                          |            |
           Suppurative                     |             2                 1                             1            |      6  1.5|
      Respiratory Epithelium, Hyperplasia  |                                                                          |      3  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  16                                                               
NTP Experiment-Test: 89002-02                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09
Study Type: CHRONIC                                         PENTACHLOROPHENOL                                     Date: 08/19/97  
Route: DOSED FEED                                                                                                 Time: 11:06:29  
                                                                                                                                    
 __________________________________________________________________________________________________________________________________ 
                                           | 7| 7| 6| 3| 7| 7| 7| 7| 7| 7| 7| 5| 7| 7| 7| 7| 7| 7| 7| 7| 7| 3| 7| 7| 4|            |
                             DAY ON TEST   | 3| 4| 5| 3| 0| 4| 4| 3| 3| 3| 1| 3| 3| 4| 1| 4| 3| 3| 3| 4| 3| 9| 3| 4| 3|            |
                                           | 9| 0| 0| 7| 1| 0| 0| 9| 9| 9| 5| 5| 8| 0| 5| 0| 8| 9| 8| 0| 8| 2| 9| 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 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     |
    200 PPM                                | 5| 5| 5| 5| 6| 6| 6| 6| 6| 6| 6| 6| 6| 6| 7| 7| 7| 7| 7| 7| 7| 7| 7| 7| 8|      L     |
                                           | 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                 |                                                                          |            |
                                           |                                                                          |            |
      Respiratory Epithelium, Metaplasia,  |                                                                          |            |
           Squamous                        |                                                                          |      3  2.0|
                                            __________________________________________________________________________|____________|
   Trachea                                 | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
 _____________________________________________________________________________________________________________________|            |
 SPECIAL SENSES SYSTEM                     |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Eye                                     |                         +                                                |   3        |
      Lens, Cataract                       |                         4                                                |      2  4.0|
      Lens, Fibrosis                       |                                                                          |      1  3.0|
      Lens, Synechia                       |                         4                                                |      2  4.0|
      Retina, Atrophy                      |                         4                                                |      3  4.0|
                                            __________________________________________________________________________|____________|
   Zymbal's Gland                          |                                                                          |   1        |
 _____________________________________________________________________________________________________________________|            |
 URINARY SYSTEM                            |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Kidney                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Mineralization                       |       2                                                                  |      1  2.0|
      Nephropathy, Chronic                 | 1  1        1  1  1  1  1  1     2  1  1  1  1  1  1  1  1  1     1  2  1|     46  1.1|
      Papilla, Necrosis                    |       4                                                                  |      1  4.0|
      Pelvis, Inflammation, Suppurative    |       3                                                                  |      1  3.0|
      Renal Tubule, Pigmentation           | 1  1  1  1  1  1  1  1  1  1  1  3  1  1  1  1  1  1  1  1  1     1  2  2|     48  1.1|
                                            __________________________________________________________________________|____________|
   Urinary Bladder                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Calculus Micro Observation Only      |       X                                                                  |      1     |
      Inflammation, Chronic Active         |       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  17                                                               
NTP Experiment-Test: 89002-02                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09
Study Type: CHRONIC                                         PENTACHLOROPHENOL                                     Date: 08/19/97  
Route: DOSED FEED                                                                                                 Time: 11:06:29  
                                                                                                                                    
 _____________________________________________________________________________________________________________________              
                                           | 4| 6| 6| 7| 6| 7| 5| 7| 7| 7| 7| 6| 7| 7| 7| 7| 7| 6| 7| 7| 3| 7| 7| 7| 7|             
                             DAY ON TEST   | 5| 0| 9| 3| 7| 3| 9| 3| 3| 3| 4| 1| 3| 3| 3| 3| 3| 2| 3| 3| 9| 2| 4| 4| 4|             
                                           | 1| 0| 0| 8| 0| 8| 2| 9| 9| 3| 0| 4| 8| 8| 9| 9| 9| 5| 8| 8| 9| 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| 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| 4| 4| 4| 4| 4| 4|             
    400 PPM                                | 8| 8| 8| 8| 8| 8| 8| 8| 8| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 0| 0| 0| 0| 0| 0|             
                                           | 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                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Parasite Metazoan                    |                                                                          |             
                                            __________________________________________________________________________|             
   Intestine Large, Rectum                 | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Parasite Metazoan                    | X        X                                                              X|             
                                            __________________________________________________________________________|             
   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     X  X  X|             
      Clear Cell Focus                     |                X                                X        X               |             
      Eosinophilic Focus                   |                               X                                          |             
      Fibrosis                             |    1                                                                     |             
      Hepatodiaphragmatic Nodule           |    X                 X                          X                       X|             
      Inflammation, Chronic                |    1  1  1  1  1        3     3     1  1  1  1  1        1  1     3  1   |             
      Mixed Cell Focus                     |                                                                          |             
      Pigmentation, Bile                   |                                                                   2      |             
      Bile Duct, Hyperplasia               |    1     1  1     3              2                 2  1           2      |             
      Hepatocyte, Necrosis                 |          2                                                               |             
      Hepatocyte, Vacuolization Cytoplasmic|                                           1                              |             
      Hepatocyte, Centrilobular,           |                                                                          |             
          Degeneration                     |                            2                                             |             
      Hepatocyte, Centrilobular, Necrosis  |                            2                                3            |             
                                            __________________________________________________________________________|             
   Mesentery                               |                                  +              +  +                     |             
      Fat, Necrosis                        |                                                 4                        |             
                                            __________________________________________________________________________|             
   Pancreas                                | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Cyst                                 |                               4                                          |             
      Acinus, Atrophy                      |             1                 4              1                    1      |             
      Acinus, Hyperplasia                  |                1                                                         |             
                                            __________________________________________________________________________|             
   Salivary Glands                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Stomach, Forestomach                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Inflammation, Chronic Active         | 3                                                  3                     |             
      Epithelium, Hyperplasia              | 3                                                  2                     |             
      Epithelium, Ulcer                    | 4                                                  4                     |             
                                            __________________________________________________________________________|             
   Stomach, Glandular                      | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Epithelium, Erosion                  |                            2                                             |             
 _____________________________________________________________________________________________________________________|             
 CARDIOVASCULAR SYSTEM                     |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Blood Vessel                            | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Heart                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Cardiomyopathy, Chronic              |       1  1  1  1  2  2  2     2  2  1     1  1  1     2  2     2  2  2  2|             
      Necrosis                             |                   2                                                      |             
 _____________________________________________________________________________________________________________________|             
 ENDOCRINE SYSTEM                          |                                                                          |             
 _____________________________________________________________________________________________________________________|             

                                                             Page  18                                                               
NTP Experiment-Test: 89002-02                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09
Study Type: CHRONIC                                         PENTACHLOROPHENOL                                     Date: 08/19/97  
Route: DOSED FEED                                                                                                 Time: 11:06:29  
                                                                                                                                    
 _____________________________________________________________________________________________________________________              
                                           | 4| 6| 6| 7| 6| 7| 5| 7| 7| 7| 7| 6| 7| 7| 7| 7| 7| 6| 7| 7| 3| 7| 7| 7| 7|             
                             DAY ON TEST   | 5| 0| 9| 3| 7| 3| 9| 3| 3| 3| 4| 1| 3| 3| 3| 3| 3| 2| 3| 3| 9| 2| 4| 4| 4|             
                                           | 1| 0| 0| 8| 0| 8| 2| 9| 9| 3| 0| 4| 8| 8| 9| 9| 9| 5| 8| 8| 9| 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| 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| 4| 4| 4| 4| 4| 4|             
    400 PPM                                | 8| 8| 8| 8| 8| 8| 8| 8| 8| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 0| 0| 0| 0| 0| 0|             
                                           | 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 Cortex                          | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Degeneration, Cystic                 |                                        1                                 |             
      Degeneration, Fatty                  | 4     1           2        1     1                             2  1     1|             
      Hyperplasia                          | 1     2              2  1     1  1        1     3     1           1  2   |             
      Hypertrophy                          |                                                                          |             
                                            __________________________________________________________________________|             
   Adrenal Medulla                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Hyperplasia                          |       1                                                     2        1   |             
                                            __________________________________________________________________________|             
   Islets, Pancreatic                      | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Parathyroid Gland                       | +  +  +  M  +  +  +  M  +  +  +  +  M  +  M  M  +  +  M  +  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Pituitary Gland                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Pars Distalis, Cyst                  |          3  2  3  2  2  2  2  1              2  3  2  2  2     2     2  2|             
      Pars Distalis, Hyperplasia           | 4           2  4     2  3  2     2              2  2                 2  1|             
      Pars Intermedia, Hyperplasia         |                                                                          |             
                                            __________________________________________________________________________|             
   Thyroid Gland                           | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      C-Cell, Hyperplasia                  |       1  1     1  1  2  1  2  1           1  1        2  1        1  1  1|             
 _____________________________________________________________________________________________________________________|             
 GENERAL BODY SYSTEM                       |                                                                          |             
                                           |                                                                          |             
    None                                   |                                                                          |             
 _____________________________________________________________________________________________________________________|             
 GENITAL SYSTEM                            |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Clitoral Gland                          | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  M  +  +  +|             
      Hyperplasia                          |          3     1                          2           3              4  2|             
      Inflammation, Chronic Active         | 1                                                                 2  3   |             
      Bilateral, Hyperplasia               |    4                                                                     |             
                                            __________________________________________________________________________|             
   Ovary                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Cyst                                 |                            4                                             |             
                                            __________________________________________________________________________|             
   Uterus                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Hemorrhage                           |                                                    4                     |             
      Endometrium, Hyperplasia, Cystic     |                                                                          |             
                                            __________________________________________________________________________|             
   Vagina                                  |                                                    +                     |             
      Inflammation, Suppurative            |                                                    3                     |             
 _____________________________________________________________________________________________________________________|             
 HEMATOPOIETIC SYSTEM                      |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Bone Marrow                             | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Hyperplasia                          |             4        3  3  3                          3        4        4|             
                                            __________________________________________________________________________|             
   Lymph Node                              | +  +  +  +  +     +              +  +  +           +        +  +  +  +  +|             
      Mediastinal, Hemorrhage              |                                                             4            |             
      Mediastinal, Pigmentation,           |                                                                          |             
          Hemosiderin                      | 1  1  2  1  1     1                 1                       2     1  2  2|             
                                            __________________________________________________________________________|             
   Lymph Node, Mandibular                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Lymph Node, Mesenteric                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Ectasia                              |                      3                                3                  |             
                                            __________________________________________________________________________|             
   Spleen                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
 _____________________________________________________________________________________________________________________|             

                                                             Page  19                                                               
NTP Experiment-Test: 89002-02                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09
Study Type: CHRONIC                                         PENTACHLOROPHENOL                                     Date: 08/19/97  
Route: DOSED FEED                                                                                                 Time: 11:06:29  
                                                                                                                                    
 _____________________________________________________________________________________________________________________              
                                           | 4| 6| 6| 7| 6| 7| 5| 7| 7| 7| 7| 6| 7| 7| 7| 7| 7| 6| 7| 7| 3| 7| 7| 7| 7|             
                             DAY ON TEST   | 5| 0| 9| 3| 7| 3| 9| 3| 3| 3| 4| 1| 3| 3| 3| 3| 3| 2| 3| 3| 9| 2| 4| 4| 4|             
                                           | 1| 0| 0| 8| 0| 8| 2| 9| 9| 3| 0| 4| 8| 8| 9| 9| 9| 5| 8| 8| 9| 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| 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| 4| 4| 4| 4| 4| 4|             
    400 PPM                                | 8| 8| 8| 8| 8| 8| 8| 8| 8| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 0| 0| 0| 0| 0| 0|             
                                           | 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               |                                                                          |             
                                           |                                                                          |             
      Hematopoietic Cell Proliferation     |             3              2                                1            |             
                                            __________________________________________________________________________|             
   Thymus                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  M  +  +  +  +  +  +  +|             
      Cyst                                 |                                                                   2      |             
 _____________________________________________________________________________________________________________________|             
 INTEGUMENTARY SYSTEM                      |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Mammary Gland                           | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Hyperplasia, Cystic                  | 2  2  1  2  1  2  2  1  2  2  3  2  3  2     2  3  2  2  3     2  2  2  2|             
                                            __________________________________________________________________________|             
   Skin                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Inflammation, Chronic Active         |    4                                                                     |             
      Epidermis, Hyperplasia               |    2                                                                     |             
      Epidermis, Ulcer                     |    4                                                                     |             
 _____________________________________________________________________________________________________________________|             
 MUSCULOSKELETAL SYSTEM                    |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Bone                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Osteopetrosis                        |                                                                          |             
                                            __________________________________________________________________________|             
   Skeletal Muscle                         |                                  +                 +                     |             
 _____________________________________________________________________________________________________________________|             
 NERVOUS SYSTEM                            |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Brain                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
 _____________________________________________________________________________________________________________________|             
 RESPIRATORY SYSTEM                        |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Lung                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Inflammation, Chronic Active         |          1     1        1     1                       1           1  2   |             
      Alveolar Epithelium, Hyperplasia     |       2  1     1                    2                                1   |             
      Alveolus, Infiltration Cellular,     |                                                                          |             
           Histiocyte                      |    1  1  1     1  1  1  1  1  1     1  1  1  1  1  2  1  1  1  1  1  2  1|             
                                            __________________________________________________________________________|             
   Nose                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Fungus                               |                                                                         X|             
      Inflammation, Chronic Active         |                                                 1                 1     2|             
      Nasolacrimal Duct, Inflammation,     |                                                                          |             
           Suppurative                     |    1        2                    1           2                 1         |             
      Respiratory Epithelium, Hyperplasia  |                                                                         2|             
      Vein, Turbinate, Septum, Thrombosis  |                                                                4         |             
                                            __________________________________________________________________________|             
   Trachea                                 | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
 _____________________________________________________________________________________________________________________|             
 SPECIAL SENSES SYSTEM                     |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Eye                                     |       +                                                                  |             
      Lens, Cataract                       |       3                                                                  |             
      Retina, Atrophy                      |       4                                                                  |             
 _____________________________________________________________________________________________________________________|             
 URINARY SYSTEM                            |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Kidney                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Nephropathy, Chronic                 | 1  1  1  1  1  1  1  1  1     1     1  1  1  1  1     1  1        2  1  1|             
      Renal Tubule, Pigmentation           | 1  1  1  1  1  1  3  2  1  1  1  1  1  1  1  1  1  2  2  1  1  1  2  1  1|             
 _____________________________________________________________________________________________________________________|             

                                                             Page  20                                                               
NTP Experiment-Test: 89002-02                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09
Study Type: CHRONIC                                         PENTACHLOROPHENOL                                     Date: 08/19/97  
Route: DOSED FEED                                                                                                 Time: 11:06:29  
                                                                                                                                    
 _____________________________________________________________________________________________________________________              
                                           | 4| 6| 6| 7| 6| 7| 5| 7| 7| 7| 7| 6| 7| 7| 7| 7| 7| 6| 7| 7| 3| 7| 7| 7| 7|             
                             DAY ON TEST   | 5| 0| 9| 3| 7| 3| 9| 3| 3| 3| 4| 1| 3| 3| 3| 3| 3| 2| 3| 3| 9| 2| 4| 4| 4|             
                                           | 1| 0| 0| 8| 0| 8| 2| 9| 9| 3| 0| 4| 8| 8| 9| 9| 9| 5| 8| 8| 9| 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| 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| 4| 4| 4| 4| 4| 4|             
    400 PPM                                | 8| 8| 8| 8| 8| 8| 8| 8| 8| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 0| 0| 0| 0| 0| 0|             
                                           | 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                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  M  +  +  +|             
 _____________________________________________________________________________________________________________________|             

                                                             Page  21                                                               
NTP Experiment-Test: 89002-02                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09
Study Type: CHRONIC                                         PENTACHLOROPHENOL                                     Date: 08/19/97  
Route: DOSED FEED                                                                                                 Time: 11:06:29  
                                                                                                                                    
 __________________________________________________________________________________________________________________________________ 
                                           | 7| 4| 7| 6| 7| 5| 7| 7| 7| 6| 7| 7| 7| 7| 7| 7| 7| 7| 7| 5| 7| 7| 5| 7| 7|            |
                             DAY ON TEST   | 3| 1| 4| 4| 3| 6| 4| 3| 4| 8| 3| 4| 3| 4| 3| 4| 3| 4| 3| 4| 3| 3| 3| 3| 4|            |
                                           | 9| 7| 0| 7| 9| 3| 0| 8| 0| 4| 9| 0| 8| 0| 9| 0| 8| 0| 8| 4| 8| 9| 5| 9| 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 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   | 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4|      A     |
    400 PPM                                | 0| 0| 0| 0| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 3|      L     |
                                           | 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                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Parasite Metazoan                    |    X                                                                     |      1     |
                                            __________________________________________________________________________|____________|
   Intestine Large, Rectum                 | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Parasite Metazoan                    | X                 X           X  X                                      X|      8     |
                                            __________________________________________________________________________|____________|
   Intestine Large, Cecum                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
                                            __________________________________________________________________________|____________|
   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     X  X     X  X|     44     |
      Clear Cell Focus                     |             X                    X              X              X        X|      8     |
      Eosinophilic Focus                   |                                                                          |      1     |
      Fibrosis                             |                                                                          |      1  1.0|
      Hepatodiaphragmatic Nodule           | X  X                    X                                                |      7     |
      Inflammation, Chronic                | 1           1     2     2  1  2  2  2  3  1  1  2     1     2  1     1  2|     33  1.5|
      Mixed Cell Focus                     |             X                    X  X  X     X                           |      5     |
      Pigmentation, Bile                   |                                                                          |      1  2.0|
      Bile Duct, Hyperplasia               |             1  2  1     1  1     1  1  1  1  1  1        2        2     1|     22  1.4|
      Hepatocyte, Necrosis                 | 1                                                                        |      2  1.5|
      Hepatocyte, Vacuolization Cytoplasmic|                                                                          |      1  1.0|
      Hepatocyte, Centrilobular,           |                                                                          |            |
          Degeneration                     |                                                                          |      1  2.0|
      Hepatocyte, Centrilobular, Necrosis  |                                                                          |      2  2.5|
                                            __________________________________________________________________________|____________|
   Mesentery                               | +                          +                                             |   5        |
      Fat, Necrosis                        | 4                          4                                             |      3  4.0|
                                            __________________________________________________________________________|____________|
   Pancreas                                | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Cyst                                 |                                                                          |      1  4.0|
      Acinus, Atrophy                      |       2     1     1  2  1                 1           2  1     2     1   |     14  1.5|
      Acinus, Hyperplasia                  |                                                                          |      1  1.0|
                                            __________________________________________________________________________|____________|
   Salivary Glands                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
                                            __________________________________________________________________________|____________|
   Stomach, Forestomach                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Inflammation, Chronic Active         |                            3                                             |      3  3.0|
      Epithelium, Hyperplasia              |                            2                                             |      3  2.3|
      Epithelium, Ulcer                    |                            4                                             |      3  4.0|
                                            __________________________________________________________________________|____________|
   Stomach, Glandular                      | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Epithelium, Erosion                  |                                                                          |      1  2.0|
 _____________________________________________________________________________________________________________________|            |
 CARDIOVASCULAR 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  22                                                               
NTP Experiment-Test: 89002-02                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09
Study Type: CHRONIC                                         PENTACHLOROPHENOL                                     Date: 08/19/97  
Route: DOSED FEED                                                                                                 Time: 11:06:29  
                                                                                                                                    
 __________________________________________________________________________________________________________________________________ 
                                           | 7| 4| 7| 6| 7| 5| 7| 7| 7| 6| 7| 7| 7| 7| 7| 7| 7| 7| 7| 5| 7| 7| 5| 7| 7|            |
                             DAY ON TEST   | 3| 1| 4| 4| 3| 6| 4| 3| 4| 8| 3| 4| 3| 4| 3| 4| 3| 4| 3| 4| 3| 3| 3| 3| 4|            |
                                           | 9| 7| 0| 7| 9| 3| 0| 8| 0| 4| 9| 0| 8| 0| 9| 0| 8| 0| 8| 4| 8| 9| 5| 9| 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 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   | 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4|      A     |
    400 PPM                                | 0| 0| 0| 0| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 3|      L     |
                                           | 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|            |
 __________________________________________________________________________________________________________________________________ 
 CARDIOVASCULAR SYSTEM - cont              |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Blood Vessel                            | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
                                            __________________________________________________________________________|____________|
   Heart                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Cardiomyopathy, Chronic              | 1     1     2     2  1  1  1  2  1  2  1  1        2  1           1  2  2|     36  1.5|
      Necrosis                             |                                                                          |      1  2.0|
 _____________________________________________________________________________________________________________________|            |
 ENDOCRINE SYSTEM                          |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Adrenal Cortex                          | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Degeneration, Cystic                 |                   2                          1                           |      3  1.3|
      Degeneration, Fatty                  | 1     1                    1           1           2  2     1        2  1|     17  1.5|
      Hyperplasia                          |             1     1     1  1        1  1     1  1     1        2     2  2|     23  1.3|
      Hypertrophy                          | 1                 2                 2        1  2  2  2     2            |      8  1.8|
                                            __________________________________________________________________________|____________|
   Adrenal Medulla                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Hyperplasia                          |                               1              1                       1   |      6  1.2|
                                            __________________________________________________________________________|____________|
   Islets, Pancreatic                      | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
                                            __________________________________________________________________________|____________|
   Parathyroid Gland                       | M  M  +  +  +  +  +  M  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  41        |
                                            __________________________________________________________________________|____________|
   Pituitary Gland                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Pars Distalis, Cyst                  | 1     3  3  1  2  1     2     2  1  2     2  2  3     2     2  2     2  2|     34  2.0|
      Pars Distalis, Hyperplasia           | 2        2  2     3  3        2  1        2  3  3     2     2     3  3  3|     26  2.4|
      Pars Intermedia, Hyperplasia         |                                                                         3|      1  3.0|
                                            __________________________________________________________________________|____________|
   Thyroid Gland                           | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      C-Cell, Hyperplasia                  |          1  1     1  1     2        2  1     2  1     1  1           2   |     27  1.3|
 _____________________________________________________________________________________________________________________|            |
 GENERAL BODY SYSTEM                       |                                                                          |            |
                                           |                                                                          |            |
    None                                   |                                                                          |            |
 _____________________________________________________________________________________________________________________|            |
 GENITAL SYSTEM                            |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Clitoral Gland                          | +  +  +  M  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  48        |
      Hyperplasia                          | 2     2     4                       2     2  2        2                  |     13  2.4|
      Inflammation, Chronic Active         |    1                                                                     |      4  1.8|
      Bilateral, Hyperplasia               |                                                                          |      1  4.0|
                                            __________________________________________________________________________|____________|
   Ovary                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Cyst                                 |          2                          4                 3                  |      4  3.3|
                                            __________________________________________________________________________|____________|
   Uterus                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Hemorrhage                           |                                                                          |      1  4.0|
      Endometrium, Hyperplasia, Cystic     |                                                                   2      |      1  2.0|
                                            __________________________________________________________________________|____________|
   Vagina                                  |                                                                          |   1        |
      Inflammation, Suppurative            |                                                                          |      1  3.0|
 _____________________________________________________________________________________________________________________|            |
 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  23                                                               
NTP Experiment-Test: 89002-02                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09
Study Type: CHRONIC                                         PENTACHLOROPHENOL                                     Date: 08/19/97  
Route: DOSED FEED                                                                                                 Time: 11:06:29  
                                                                                                                                    
 __________________________________________________________________________________________________________________________________ 
                                           | 7| 4| 7| 6| 7| 5| 7| 7| 7| 6| 7| 7| 7| 7| 7| 7| 7| 7| 7| 5| 7| 7| 5| 7| 7|            |
                             DAY ON TEST   | 3| 1| 4| 4| 3| 6| 4| 3| 4| 8| 3| 4| 3| 4| 3| 4| 3| 4| 3| 4| 3| 3| 3| 3| 4|            |
                                           | 9| 7| 0| 7| 9| 3| 0| 8| 0| 4| 9| 0| 8| 0| 9| 0| 8| 0| 8| 4| 8| 9| 5| 9| 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 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   | 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4|      A     |
    400 PPM                                | 0| 0| 0| 0| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 3|      L     |
                                           | 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                          |       3              4        3  3     3           4  4  3  3     2      |     17  3.3|
                                            __________________________________________________________________________|____________|
   Lymph Node                              |    +  +  +     +        +  +  +     +                       +     +     +|  26        |
      Mediastinal, Hemorrhage              |                                                                          |      1  4.0|
      Mediastinal, Pigmentation,           |                                                                          |            |
          Hemosiderin                      |    2  2  2     1        2  2  1     2                       2           2|     21  1.6|
                                            __________________________________________________________________________|____________|
   Lymph Node, Mandibular                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
                                            __________________________________________________________________________|____________|
   Lymph Node, Mesenteric                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Ectasia                              |                               2                                          |      3  2.7|
                                            __________________________________________________________________________|____________|
   Spleen                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Hematopoietic Cell Proliferation     |                                     1  1  1                              |      6  1.5|
                                            __________________________________________________________________________|____________|
   Thymus                                  | +  +  +  +  +  +  +  +  +  +  +  +  M  +  +  +  +  +  +  +  +  +  +  +  +|  48        |
      Cyst                                 |                                                       2     3            |      3  2.3|
 _____________________________________________________________________________________________________________________|            |
 INTEGUMENTARY SYSTEM                      |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Mammary Gland                           | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Hyperplasia, Cystic                  | 2     2  2  2  2  2  2  2  2     2  2  2  2  2  3  2  2  1  2  2     2  2|     45  2.0|
                                            __________________________________________________________________________|____________|
   Skin                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Inflammation, Chronic Active         |                                                                          |      1  4.0|
      Epidermis, Hyperplasia               |                         3                                                |      2  2.5|
      Epidermis, Ulcer                     |                                                                          |      1  4.0|
 _____________________________________________________________________________________________________________________|            |
 MUSCULOSKELETAL SYSTEM                    |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Bone                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Osteopetrosis                        |       3              2           3     3                                 |      4  2.8|
                                            __________________________________________________________________________|____________|
   Skeletal Muscle                         |                                                                          |   2        |
 _____________________________________________________________________________________________________________________|            |
 NERVOUS SYSTEM                            |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Brain                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
 _____________________________________________________________________________________________________________________|            |
 RESPIRATORY SYSTEM                        |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Lung                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Inflammation, Chronic Active         |             1     1     1     1  1     1  1  1        1        1         |     17  1.1|
      Alveolar Epithelium, Hyperplasia     |                                                                          |      5  1.4|
      Alveolus, Infiltration Cellular,     |                                                                          |            |
           Histiocyte                      | 1  1  2  2  1     1  1  1  1  1  1  1  1  1  1  1     1  1  1  1  1  1  1|     45  1.1|
                                            __________________________________________________________________________|____________|
   Nose                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Fungus                               |                                                                          |      1     |
      Inflammation, Chronic Active         |       1                 2                          1     1               |      7  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  24                                                               
NTP Experiment-Test: 89002-02                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09
Study Type: CHRONIC                                         PENTACHLOROPHENOL                                     Date: 08/19/97  
Route: DOSED FEED                                                                                                 Time: 11:06:29  
                                                                                                                                    
 __________________________________________________________________________________________________________________________________ 
                                           | 7| 4| 7| 6| 7| 5| 7| 7| 7| 6| 7| 7| 7| 7| 7| 7| 7| 7| 7| 5| 7| 7| 5| 7| 7|            |
                             DAY ON TEST   | 3| 1| 4| 4| 3| 6| 4| 3| 4| 8| 3| 4| 3| 4| 3| 4| 3| 4| 3| 4| 3| 3| 3| 3| 4|            |
                                           | 9| 7| 0| 7| 9| 3| 0| 8| 0| 4| 9| 0| 8| 0| 9| 0| 8| 0| 8| 4| 8| 9| 5| 9| 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 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   | 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4|      A     |
    400 PPM                                | 0| 0| 0| 0| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 3|      L     |
                                           | 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                 |                                                                          |            |
                                           |                                                                          |            |
      Nasolacrimal Duct, Inflammation,     |                                                                          |            |
           Suppurative                     | 1           1                             2                 1           3|     10  1.5|
      Respiratory Epithelium, Hyperplasia  |                                                    1                     |      2  1.5|
      Vein, Turbinate, Septum, Thrombosis  |                                                                          |      1  4.0|
                                            __________________________________________________________________________|____________|
   Trachea                                 | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
 _____________________________________________________________________________________________________________________|            |
 SPECIAL SENSES SYSTEM                     |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Eye                                     |    +                                                                     |   2        |
      Lens, Cataract                       |    3                                                                     |      2  3.0|
      Retina, Atrophy                      |    4                                                                     |      2  4.0|
 _____________________________________________________________________________________________________________________|            |
 URINARY SYSTEM                            |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Kidney                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Nephropathy, Chronic                 | 1     2  1  1  1  1  2  1  2  1  1  2  1  1  1  1  1  1  1  1  1  1  1  1|     44  1.1|
      Renal Tubule, Pigmentation           | 1  1  1  1  1  2  1  2  1  2  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1|     50  1.2|
                                            __________________________________________________________________________|____________|
   Urinary Bladder                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  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  25                                                               
NTP Experiment-Test: 89002-02                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09
Study Type: CHRONIC                                         PENTACHLOROPHENOL                                     Date: 08/19/97  
Route: DOSED FEED                                                                                                 Time: 11:06:29  
                                                                                                                                    
 _____________________________________________________________________________________________________________________              
                                           | 7| 7| 5| 4| 6| 7| 7| 7| 7| 6| 7| 4| 6| 5| 7| 7| 7| 6| 6| 7| 5| 4| 7| 5| 7|             
                             DAY ON TEST   | 2| 3| 8| 4| 9| 3| 4| 4| 4| 3| 0| 5| 4| 8| 3| 3| 3| 0| 3| 3| 7| 1| 3| 8| 4|             
                                           | 2| 8| 6| 4| 2| 9| 0| 0| 0| 4| 4| 9| 6| 8| 8| 8| 9| 5| 2| 8| 1| 7| 9| 6| 0|             
 _____________________________________________________________________________________________________________________|             
                                           | 0| 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   | 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4|             
    600 PPM                                | 3| 3| 3| 3| 3| 3| 3| 3| 3| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 5| 5| 5| 5| 5| 5|             
                                           | 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                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Parasite Metazoan                    |                X                          X                             X|             
                                            __________________________________________________________________________|             
   Intestine Large, Rectum                 | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Parasite Metazoan                    | X           X                                      X                     |             
                                            __________________________________________________________________________|             
   Intestine Large, Cecum                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Intestine Small, Duodenum               | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Intestine Small, Jejunum                | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Intestine Small, Ileum                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Liver                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Angiectasis                          |                                                                          |             
      Basophilic Focus                     | X           X  X  X  X  X  X  X     X     X  X  X  X     X     X  X     X|             
      Clear Cell Focus                     |                                           X                              |             
      Eosinophilic Focus                   |                   X                                                      |             
      Hematopoietic Cell Proliferation     |          1                                                               |             
      Hepatodiaphragmatic Nodule           |                               X                                          |             
      Inflammation, Chronic                | 1           2  2  1  1  1     1     1     1  1  1  1     1        1      |             
      Mixed Cell Focus                     |                X                                                         |             
      Bile Duct, Hyperplasia               |    2              1        1                    1     1           1  2  2|             
      Hepatocyte, Degeneration, Cystic     |                                                                          |             
      Hepatocyte, Vacuolization Cytoplasmic|                                           1                              |             
      Hepatocyte, Centrilobular,           |                                                                          |             
          Degeneration                     |                                                                          |             
      Kupffer Cell, Hypertrophy            |                               1                                          |             
                                            __________________________________________________________________________|             
   Mesentery                               |    +              +                                   +                  |             
      Fat, Necrosis                        |                   4                                                      |             
                                            __________________________________________________________________________|             
   Oral Mucosa                             |                                                                          |             
                                            __________________________________________________________________________|             
   Pancreas                                | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Inflammation, Chronic Active         |                                                                          |             
      Acinus, Atrophy                      |                                                 1  1              1      |             
                                            __________________________________________________________________________|             
   Salivary Glands                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Stomach, Forestomach                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Inflammation, Chronic Active         |                                                                          |             
      Epithelium, Hyperplasia              |                                                                          |             
      Epithelium, Ulcer                    |                                                                          |             
                                            __________________________________________________________________________|             
   Stomach, Glandular                      | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Epithelium, Erosion                  |                                                                          |             
 _____________________________________________________________________________________________________________________|             
 CARDIOVASCULAR SYSTEM                     |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Blood Vessel                            | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Heart                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Cardiomyopathy, Chronic              | 1  1        1        1  1  1  1  1     2  1  1              1     2  1  1|             
 _____________________________________________________________________________________________________________________|             
 ENDOCRINE SYSTEM                          |                                                                          |             
                                           |                                                                          |             
 _____________________________________________________________________________________________________________________|             

                                                             Page  26                                                               
NTP Experiment-Test: 89002-02                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09
Study Type: CHRONIC                                         PENTACHLOROPHENOL                                     Date: 08/19/97  
Route: DOSED FEED                                                                                                 Time: 11:06:29  
                                                                                                                                    
 _____________________________________________________________________________________________________________________              
                                           | 7| 7| 5| 4| 6| 7| 7| 7| 7| 6| 7| 4| 6| 5| 7| 7| 7| 6| 6| 7| 5| 4| 7| 5| 7|             
                             DAY ON TEST   | 2| 3| 8| 4| 9| 3| 4| 4| 4| 3| 0| 5| 4| 8| 3| 3| 3| 0| 3| 3| 7| 1| 3| 8| 4|             
                                           | 2| 8| 6| 4| 2| 9| 0| 0| 0| 4| 4| 9| 6| 8| 8| 8| 9| 5| 2| 8| 1| 7| 9| 6| 0|             
 _____________________________________________________________________________________________________________________|             
                                           | 0| 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   | 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4|             
    600 PPM                                | 3| 3| 3| 3| 3| 3| 3| 3| 3| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 5| 5| 5| 5| 5| 5|             
                                           | 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 Cortex                          | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Degeneration, Fatty                  |       2           2        2                 2  1     2                  |             
      Fibrosis                             |    2                                                                     |             
      Hyperplasia                          |                         2  2  1                          1        1      |             
      Hypertrophy                          |    1                                         2  1                        |             
                                            __________________________________________________________________________|             
   Adrenal Medulla                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Hyperplasia                          |                      1     1                       2  1        1         |             
                                            __________________________________________________________________________|             
   Islets, Pancreatic                      | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Hyperplasia                          |                                                                          |             
                                            __________________________________________________________________________|             
   Parathyroid Gland                       | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  M  +  +  +  M  +|             
                                            __________________________________________________________________________|             
   Pituitary Gland                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Thrombosis                           |                                                 4                        |             
      Pars Distalis, Cyst                  |       2  2     2  2  2  2  2     2  2  2              2     2     3     2|             
      Pars Distalis, Hyperplasia           |       2  2     2  2     2  2     1  2                 2        2  1  3  2|             
      Pars Intermedia, Cyst                |                1                                                         |             
                                            __________________________________________________________________________|             
   Thyroid Gland                           | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      C-Cell, Hyperplasia                  |    1           1              1                    2     1        1     1|             
 _____________________________________________________________________________________________________________________|             
 GENERAL BODY SYSTEM                       |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Tissue NOS                              |    +                                                                     |             
 _____________________________________________________________________________________________________________________|             
 GENITAL SYSTEM                            |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Clitoral Gland                          | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Hyperplasia                          |    3                       2                          1              2   |             
      Inflammation, Chronic Active         |                3                                                         |             
      Duct, Cyst                           | 2                                                                        |             
                                            __________________________________________________________________________|             
   Ovary                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Cyst                                 |          2                                                           4   |             
                                            __________________________________________________________________________|             
   Uterus                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Hydrometra                           |             3                                                            |             
      Endometrium, Hyperplasia, Cystic     |                                                                          |             
 _____________________________________________________________________________________________________________________|             
 HEMATOPOIETIC SYSTEM                      |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Bone Marrow                             | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Hyperplasia, Histiocytic             |                                                                         2|             
      Hyperplasia                          |    4  4  4                 4     3                 4  4     4        4  4|             
                                            __________________________________________________________________________|             
   Lymph Node                              |             +     +  +  +  +        +     +        +  +     +  +     +   |             
      Mediastinal, Pigmentation,           |                                                                          |             
          Hemosiderin                      |             1     2  1  1           1     1        1           1     1   |             
                                            __________________________________________________________________________|             
   Lymph Node, Mandibular                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Lymph Node, Mesenteric                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Spleen                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Accessory Spleen                     |          X                                                               |             
      Hematopoietic Cell Proliferation     |          1        1                                3           2  1      |             
 _____________________________________________________________________________________________________________________|             

                                                             Page  27                                                               
NTP Experiment-Test: 89002-02                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09
Study Type: CHRONIC                                         PENTACHLOROPHENOL                                     Date: 08/19/97  
Route: DOSED FEED                                                                                                 Time: 11:06:29  
                                                                                                                                    
 _____________________________________________________________________________________________________________________              
                                           | 7| 7| 5| 4| 6| 7| 7| 7| 7| 6| 7| 4| 6| 5| 7| 7| 7| 6| 6| 7| 5| 4| 7| 5| 7|             
                             DAY ON TEST   | 2| 3| 8| 4| 9| 3| 4| 4| 4| 3| 0| 5| 4| 8| 3| 3| 3| 0| 3| 3| 7| 1| 3| 8| 4|             
                                           | 2| 8| 6| 4| 2| 9| 0| 0| 0| 4| 4| 9| 6| 8| 8| 8| 9| 5| 2| 8| 1| 7| 9| 6| 0|             
 _____________________________________________________________________________________________________________________|             
                                           | 0| 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   | 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4|             
    600 PPM                                | 3| 3| 3| 3| 3| 3| 3| 3| 3| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 5| 5| 5| 5| 5| 5|             
                                           | 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               |                                                                          |             
                                           |                                                                          |             
      Necrosis                             |                            4                                             |             
                                            __________________________________________________________________________|             
   Thymus                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  M  +  +  +  +  +  +  +  +  +  +  +|             
      Ectopic Parathyroid Gland            |                                                                          |             
 _____________________________________________________________________________________________________________________|             
 INTEGUMENTARY SYSTEM                      |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Mammary Gland                           | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Hyperplasia, Cystic                  | 2  2  2  1  1  2  1     2     4  1     1  2  2  2  2  1  2  2  2  2  2   |             
      Inflammation, Chronic                | 3                                                                        |             
                                            __________________________________________________________________________|             
   Skin                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
 _____________________________________________________________________________________________________________________|             
 MUSCULOSKELETAL SYSTEM                    |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Bone                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Osteopetrosis                        |                            3                                             |             
                                            __________________________________________________________________________|             
   Skeletal Muscle                         |                                                                          |             
 _____________________________________________________________________________________________________________________|             
 NERVOUS SYSTEM                            |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Brain                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Hemorrhage                           |          3                       3                                       |             
 _____________________________________________________________________________________________________________________|             
 RESPIRATORY SYSTEM                        |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Lung                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Inflammation, Chronic Active         |                1  1                       1  1  1  1     1               |             
      Alveolar Epithelium, Hyperplasia     |                                        2     1                           |             
      Alveolus, Infiltration Cellular,     |                                                                          |             
           Histiocyte                      | 1  2  1     1  1  1  1  1  1  1  1  1  1  1  1  1  1     1  1  1  1  1  1|             
                                            __________________________________________________________________________|             
   Nose                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Inflammation, Chronic Active         |                   1                                         1        2   |             
      Nasolacrimal Duct, Inflammation,     |                                                                          |             
           Suppurative                     |                1                 2           3                          1|             
      Respiratory Epithelium, Hyperplasia  |             2     2                                                  2   |             
      Respiratory Epithelium, Metaplasia,  |                                                                          |             
           Squamous                        |                                                             1            |             
                                            __________________________________________________________________________|             
   Trachea                                 | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
 _____________________________________________________________________________________________________________________|             
 SPECIAL SENSES SYSTEM                     |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Eye                                     |                      +                                               +   |             
      Lens, Cataract                       |                      4                                               4   |             
      Retina, Atrophy                      |                      4                                               4   |             
 _____________________________________________________________________________________________________________________|             
 URINARY SYSTEM                            |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Kidney                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Accumulation, Hyaline Droplet        |       2                                                                  |             
      Hydronephrosis                       |                                        4                                 |             
      Nephropathy, Chronic                 | 1  1  1     1  1  1  1  1  1  2  1  1  1  2  1  1  1  1  1  1  1  1  1  1|             
 _____________________________________________________________________________________________________________________|             

                                                             Page  28                                                               
NTP Experiment-Test: 89002-02                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09
Study Type: CHRONIC                                         PENTACHLOROPHENOL                                     Date: 08/19/97  
Route: DOSED FEED                                                                                                 Time: 11:06:29  
                                                                                                                                    
 _____________________________________________________________________________________________________________________              
                                           | 7| 7| 5| 4| 6| 7| 7| 7| 7| 6| 7| 4| 6| 5| 7| 7| 7| 6| 6| 7| 5| 4| 7| 5| 7|             
                             DAY ON TEST   | 2| 3| 8| 4| 9| 3| 4| 4| 4| 3| 0| 5| 4| 8| 3| 3| 3| 0| 3| 3| 7| 1| 3| 8| 4|             
                                           | 2| 8| 6| 4| 2| 9| 0| 0| 0| 4| 4| 9| 6| 8| 8| 8| 9| 5| 2| 8| 1| 7| 9| 6| 0|             
 _____________________________________________________________________________________________________________________|             
                                           | 0| 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   | 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4|             
    600 PPM                                | 3| 3| 3| 3| 3| 3| 3| 3| 3| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 5| 5| 5| 5| 5| 5|             
                                           | 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, Pigmentation           | 1  2  3  1  2  1  1  1  1  1  2  1  1  2  1  1  1  2  1  2  2  1  1  3  2|             
                                            __________________________________________________________________________|             
   Ureter                                  |                                        +                                 |             
                                            __________________________________________________________________________|             
   Urinary Bladder                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
 _____________________________________________________________________________________________________________________|             

                                                             Page  29                                                               
NTP Experiment-Test: 89002-02                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09
Study Type: CHRONIC                                         PENTACHLOROPHENOL                                     Date: 08/19/97  
Route: DOSED FEED                                                                                                 Time: 11:06:29  
                                                                                                                                    
 __________________________________________________________________________________________________________________________________ 
                                           | 7| 6| 7| 6| 5| 7| 6| 7| 7| 6| 7| 6| 7| 7| 6| 7| 7| 7| 7| 7| 7| 7| 5| 7| 7|            |
                             DAY ON TEST   | 3| 0| 4| 8| 7| 3| 4| 3| 4| 3| 3| 9| 3| 4| 1| 4| 3| 3| 3| 4| 4| 3| 9| 3| 4|            |
                                           | 9| 5| 0| 4| 2| 8| 2| 8| 0| 4| 9| 0| 8| 0| 3| 0| 9| 9| 9| 0| 0| 8| 2| 9| 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 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   | 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4|      A     |
    600 PPM                                | 5| 5| 5| 5| 6| 6| 6| 6| 6| 6| 6| 6| 6| 6| 7| 7| 7| 7| 7| 7| 7| 7| 7| 7| 8|      L     |
                                           | 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                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Parasite Metazoan                    |                                                    X        X            |      5     |
                                            __________________________________________________________________________|____________|
   Intestine Large, Rectum                 | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Parasite Metazoan                    | X                                            X                           |      5     |
                                            __________________________________________________________________________|____________|
   Intestine Large, Cecum                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
                                            __________________________________________________________________________|____________|
   Intestine Small, Duodenum               | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
                                            __________________________________________________________________________|____________|
   Intestine Small, Jejunum                | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
                                            __________________________________________________________________________|____________|
   Intestine Small, Ileum                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
                                            __________________________________________________________________________|____________|
   Liver                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Angiectasis                          |                                           1                              |      1  1.0|
      Basophilic Focus                     | X  X  X        X        X  X  X        X  X  X  X  X  X  X  X  X     X  X|     35     |
      Clear Cell Focus                     |                                                       X                 X|      3     |
      Eosinophilic Focus                   |                            X                                   X         |      3     |
      Hematopoietic Cell Proliferation     |                                                                          |      1  1.0|
      Hepatodiaphragmatic Nodule           | X                             X                                          |      3     |
      Inflammation, Chronic                | 2     1        1     3     1     1              1  1  1  1     1  1     2|     27  1.2|
      Mixed Cell Focus                     |                                                 X                        |      2     |
      Bile Duct, Hyperplasia               |    2                 2        2     2  2  1  1  1        1     1     2   |     19  1.5|
      Hepatocyte, Degeneration, Cystic     |                                                                      2   |      1  2.0|
      Hepatocyte, Vacuolization Cytoplasmic|                                  1        1                              |      3  1.0|
      Hepatocyte, Centrilobular,           |                                                                          |            |
          Degeneration                     |                                                    1                     |      1  1.0|
      Kupffer Cell, Hypertrophy            |                                                                          |      1  1.0|
                                            __________________________________________________________________________|____________|
   Mesentery                               |    +     +                                                               |   5        |
      Fat, Necrosis                        |                                                                          |      1  4.0|
                                            __________________________________________________________________________|____________|
   Oral Mucosa                             |       +                                                                  |   1        |
                                            __________________________________________________________________________|____________|
   Pancreas                                | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Inflammation, Chronic Active         |                         1                                                |      1  1.0|
      Acinus, Atrophy                      |       2  2              1  3        2                       2            |      9  1.7|
                                            __________________________________________________________________________|____________|
   Salivary Glands                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
                                            __________________________________________________________________________|____________|
   Stomach, Forestomach                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Inflammation, Chronic Active         |          3                                                               |      1  3.0|
      Epithelium, Hyperplasia              |    2     2        1                                                      |      3  1.7|
      Epithelium, Ulcer                    |          4                                                               |      1  4.0|
                                            __________________________________________________________________________|____________|
   Stomach, Glandular                      | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Epithelium, Erosion                  |             2     1                                                      |      2  1.5|
 _____________________________________________________________________________________________________________________|            |
 CARDIOVASCULAR 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  30                                                               
NTP Experiment-Test: 89002-02                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09
Study Type: CHRONIC                                         PENTACHLOROPHENOL                                     Date: 08/19/97  
Route: DOSED FEED                                                                                                 Time: 11:06:29  
                                                                                                                                    
 __________________________________________________________________________________________________________________________________ 
                                           | 7| 6| 7| 6| 5| 7| 6| 7| 7| 6| 7| 6| 7| 7| 6| 7| 7| 7| 7| 7| 7| 7| 5| 7| 7|            |
                             DAY ON TEST   | 3| 0| 4| 8| 7| 3| 4| 3| 4| 3| 3| 9| 3| 4| 1| 4| 3| 3| 3| 4| 4| 3| 9| 3| 4|            |
                                           | 9| 5| 0| 4| 2| 8| 2| 8| 0| 4| 9| 0| 8| 0| 3| 0| 9| 9| 9| 0| 0| 8| 2| 9| 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 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   | 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4|      A     |
    600 PPM                                | 5| 5| 5| 5| 6| 6| 6| 6| 6| 6| 6| 6| 6| 6| 7| 7| 7| 7| 7| 7| 7| 7| 7| 7| 8|      L     |
                                           | 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|            |
 __________________________________________________________________________________________________________________________________ 
 CARDIOVASCULAR SYSTEM - cont              |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Blood Vessel                            | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
                                            __________________________________________________________________________|____________|
   Heart                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Cardiomyopathy, Chronic              | 1  1  2  1     2  2     1     1  1  1  2  1  1  2  2  1  2     1     1  1|     35  1.3|
 _____________________________________________________________________________________________________________________|            |
 ENDOCRINE SYSTEM                          |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Adrenal Cortex                          | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Degeneration, Fatty                  | 1        1     2                       1           2     1  1  1     1   |     15  1.5|
      Fibrosis                             |                                                                          |      1  2.0|
      Hyperplasia                          |                2        1                          2     2  2  1     2   |     12  1.6|
      Hypertrophy                          |                2        1              1                 1               |      7  1.3|
                                            __________________________________________________________________________|____________|
   Adrenal Medulla                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Hyperplasia                          |          1                                         2                     |      7  1.3|
                                            __________________________________________________________________________|____________|
   Islets, Pancreatic                      | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Hyperplasia                          |                                                 2                        |      1  2.0|
                                            __________________________________________________________________________|____________|
   Parathyroid Gland                       | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  M  +  +  +  +  +  +|  47        |
                                            __________________________________________________________________________|____________|
   Pituitary Gland                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Thrombosis                           |                                                                          |      1  4.0|
      Pars Distalis, Cyst                  | 2  2  3  2        1     3  1  2  1     2     2  2  2  2  2  1        2  2|     32  2.0|
      Pars Distalis, Hyperplasia           | 2     2  2           4  2     2  3  3  1  2     2     2     1        2   |     27  2.0|
      Pars Intermedia, Cyst                |                                                                          |      1  1.0|
                                            __________________________________________________________________________|____________|
   Thyroid Gland                           | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      C-Cell, Hyperplasia                  | 1  1  1     1  2     2        1  2  2  1                 1  1        2   |     20  1.3|
 _____________________________________________________________________________________________________________________|            |
 GENERAL BODY SYSTEM                       |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Tissue NOS                              |                                                                          |   1        |
 _____________________________________________________________________________________________________________________|            |
 GENITAL SYSTEM                            |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Clitoral Gland                          | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Hyperplasia                          |                2           1        2     3        3  2        2         |     11  2.1|
      Inflammation, Chronic Active         |       2     2     1                                         2            |      5  2.0|
      Duct, Cyst                           |                                                                          |      1  2.0|
                                            __________________________________________________________________________|____________|
   Ovary                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Cyst                                 |             4        3                                4  2     3     3   |      8  3.1|
                                            __________________________________________________________________________|____________|
   Uterus                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Hydrometra                           |                                                       4                  |      2  3.5|
      Endometrium, Hyperplasia, Cystic     |                      3                                                   |      1  3.0|
 _____________________________________________________________________________________________________________________|            |
 HEMATOPOIETIC SYSTEM                      |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Bone Marrow                             | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  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  31                                                               
NTP Experiment-Test: 89002-02                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09
Study Type: CHRONIC                                         PENTACHLOROPHENOL                                     Date: 08/19/97  
Route: DOSED FEED                                                                                                 Time: 11:06:29  
                                                                                                                                    
 __________________________________________________________________________________________________________________________________ 
                                           | 7| 6| 7| 6| 5| 7| 6| 7| 7| 6| 7| 6| 7| 7| 6| 7| 7| 7| 7| 7| 7| 7| 5| 7| 7|            |
                             DAY ON TEST   | 3| 0| 4| 8| 7| 3| 4| 3| 4| 3| 3| 9| 3| 4| 1| 4| 3| 3| 3| 4| 4| 3| 9| 3| 4|            |
                                           | 9| 5| 0| 4| 2| 8| 2| 8| 0| 4| 9| 0| 8| 0| 3| 0| 9| 9| 9| 0| 0| 8| 2| 9| 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 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   | 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4|      A     |
    600 PPM                                | 5| 5| 5| 5| 6| 6| 6| 6| 6| 6| 6| 6| 6| 6| 7| 7| 7| 7| 7| 7| 7| 7| 7| 7| 8|      L     |
                                           | 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               |                                                                          |            |
                                           |                                                                          |            |
      Hyperplasia, Histiocytic             |                                                                          |      1  2.0|
      Hyperplasia                          |    4     4  4     4           4     4  3           4     4  3        4   |     21  3.9|
                                            __________________________________________________________________________|____________|
   Lymph Node                              |    +     +  +  +  +        +     +  +        +  +  +  +     +     +  +  +|  28        |
      Mediastinal, Pigmentation,           |                                                                          |            |
          Hemosiderin                      |    1        1  2  2        2     2  1        2  1  2  1     1     1  1  1|     24  1.3|
                                            __________________________________________________________________________|____________|
   Lymph Node, Mandibular                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
                                            __________________________________________________________________________|____________|
   Lymph Node, Mesenteric                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
                                            __________________________________________________________________________|____________|
   Spleen                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Accessory Spleen                     |                                                                          |      1     |
      Hematopoietic Cell Proliferation     |                         3        3              1  3                    1|     10  1.9|
      Necrosis                             |                                                                          |      1  4.0|
                                            __________________________________________________________________________|____________|
   Thymus                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  M  +  +  +  M  +  +  +  +  +  +|  47        |
      Ectopic Parathyroid Gland            |                   2        2                                             |      2  2.0|
 _____________________________________________________________________________________________________________________|            |
 INTEGUMENTARY SYSTEM                      |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Mammary Gland                           | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Hyperplasia, Cystic                  | 2  2     2  2  2     2  2     3  2  2     2  2  2  2  2  2  2  2  3  2  2|     42  2.0|
      Inflammation, Chronic                |                                                                          |      1  3.0|
                                            __________________________________________________________________________|____________|
   Skin                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
 _____________________________________________________________________________________________________________________|            |
 MUSCULOSKELETAL SYSTEM                    |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Bone                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Osteopetrosis                        |                         4                                                |      2  3.5|
                                            __________________________________________________________________________|____________|
   Skeletal Muscle                         |                                           +                              |   1        |
 _____________________________________________________________________________________________________________________|            |
 NERVOUS SYSTEM                            |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Brain                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Hemorrhage                           |                                                                          |      2  3.0|
 _____________________________________________________________________________________________________________________|            |
 RESPIRATORY SYSTEM                        |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Lung                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Inflammation, Chronic Active         |                      1  1  1  1                 1  1  1              1   |     15  1.0|
      Alveolar Epithelium, Hyperplasia     |                                                                   2      |      3  1.7|
      Alveolus, Infiltration Cellular,     |                                                                          |            |
           Histiocyte                      | 1     1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1     2  1|     46  1.0|
                                            __________________________________________________________________________|____________|
   Nose                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Inflammation, Chronic Active         |                                                    1  1        2         |      6  1.3|
      Nasolacrimal Duct, Inflammation,     |                                                                          |            |
           Suppurative                     |             2     2                                                      |      6  1.8|
 __________________________________________________________________________________________________________________________________ 

  * : 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  32                                                               
NTP Experiment-Test: 89002-02                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09
Study Type: CHRONIC                                         PENTACHLOROPHENOL                                     Date: 08/19/97  
Route: DOSED FEED                                                                                                 Time: 11:06:29  
                                                                                                                                    
 __________________________________________________________________________________________________________________________________ 
                                           | 7| 6| 7| 6| 5| 7| 6| 7| 7| 6| 7| 6| 7| 7| 6| 7| 7| 7| 7| 7| 7| 7| 5| 7| 7|            |
                             DAY ON TEST   | 3| 0| 4| 8| 7| 3| 4| 3| 4| 3| 3| 9| 3| 4| 1| 4| 3| 3| 3| 4| 4| 3| 9| 3| 4|            |
                                           | 9| 5| 0| 4| 2| 8| 2| 8| 0| 4| 9| 0| 8| 0| 3| 0| 9| 9| 9| 0| 0| 8| 2| 9| 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 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   | 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4|      A     |
    600 PPM                                | 5| 5| 5| 5| 6| 6| 6| 6| 6| 6| 6| 6| 6| 6| 7| 7| 7| 7| 7| 7| 7| 7| 7| 7| 8|      L     |
                                           | 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                 |                                                                          |            |
                                           |                                                                          |            |
      Respiratory Epithelium, Hyperplasia  |                                                                2         |      4  2.0|
      Respiratory Epithelium, Metaplasia,  |                                                                          |            |
           Squamous                        |                                                                          |      1  1.0|
                                            __________________________________________________________________________|____________|
   Trachea                                 | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
 _____________________________________________________________________________________________________________________|            |
 SPECIAL SENSES SYSTEM                     |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Eye                                     |                                                                          |   2        |
      Lens, Cataract                       |                                                                          |      2  4.0|
      Retina, Atrophy                      |                                                                          |      2  4.0|
 _____________________________________________________________________________________________________________________|            |
 URINARY SYSTEM                            |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Kidney                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Accumulation, Hyaline Droplet        |                                                                          |      1  2.0|
      Hydronephrosis                       |                                                                          |      1  4.0|
      Nephropathy, Chronic                 | 1  1  1     1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1|     48  1.0|
      Renal Tubule, Pigmentation           | 1  2  1  1  2  2  1  2  1  1  1  2  1  1  2  1  1  1  1  1  1  1  2  1  1|     50  1.4|
                                            __________________________________________________________________________|____________|
   Ureter                                  |                                                                          |   1        |
                                            __________________________________________________________________________|____________|
   Urinary Bladder                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  M  +  +  +  +  +  +  +  +|  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  33                                                               
NTP Experiment-Test: 89002-02                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09
Study Type: CHRONIC                                         PENTACHLOROPHENOL                                     Date: 08/19/97  
Route: DOSED FEED                                                                                                 Time: 11:06:29  
                                                                                                                                    
 _____________________________________________________________________________________________________________________              
                                           | 6| 6| 5| 7| 5| 7| 6| 5| 6| 7| 7| 7| 5| 6| 3| 7| 7| 5| 6| 6| 7| 7| 7| 7| 7|             
                             DAY ON TEST   | 4| 0| 6| 1| 6| 3| 1| 7| 4| 3| 3| 0| 3| 9| 9| 3| 1| 7| 6| 8| 3| 2| 0| 3| 3|             
                                           | 6| 0| 1| 5| 4| 3| 9| 6| 5| 6| 6| 3| 5| 5| 6| 6| 5| 9| 3| 4| 6| 4| 2| 6| 6|             
 _____________________________________________________________________________________________________________________|             
                                           | 0| 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 PPM                                  | 0| 0| 0| 0| 0| 0| 0| 0| 0| 1| 1| 1| 1| 1| 1| 1| 1| 2| 2| 2| 2| 2| 2| 2| 2|             
                                           | 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 2| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 7| 8|             
 _____________________________________________________________________________________________________________________|             
 ALIMENTARY SYSTEM                         |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Esophagus                               | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Intestine Large, Colon                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Parasite Metazoan                    |                                              X                           |             
                                            __________________________________________________________________________|             
   Intestine Large, Rectum                 | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Parasite Metazoan                    |                                                                          |             
                                            __________________________________________________________________________|             
   Intestine Large, Cecum                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Intestine Small, Duodenum               | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Epithelium, Erosion                  |                            3                                             |             
                                            __________________________________________________________________________|             
   Intestine Small, Jejunum                | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Intestine Small, Ileum                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Liver                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Angiectasis                          |          1                                                               |             
      Basophilic Focus                     |    X                       X        X     X  X              X  X     X  X|             
      Clear Cell Focus                     |                                                                      X  X|             
      Eosinophilic Focus                   |                   X                                                      |             
      Inflammation, Chronic                | 2        1              1  1        2     1  1  1  1        1     1  1  1|             
      Mixed Cell Focus                     |                                                                          |             
      Bile Duct, Hyperplasia               | 1  3     1  1  3  2  1  2  1  2  3  1  3  1  2  2  1  3  3  1  2  1  2  1|             
      Hepatocyte, Degeneration, Cystic     |                2     1     3  2  2     2     1  1        3               |             
      Hepatocyte, Necrosis                 |                                     1                                    |             
      Hepatocyte, Vacuolization Cytoplasmic|                         1  1        1           1              1         |             
      Hepatocyte, Centrilobular,           |                                                                          |             
          Degeneration                     |                                                                1         |             
      Hepatocyte, Centrilobular, Necrosis  |                               4                                          |             
      Kupffer Cell, Hypertrophy            |          1                                                               |             
                                            __________________________________________________________________________|             
   Mesentery                               |    +                          +                          +               |             
      Fat, Necrosis                        |    4                          4                          4               |             
                                            __________________________________________________________________________|             
   Oral Mucosa                             |                                                                      +   |             
                                            __________________________________________________________________________|             
   Pancreas                                | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Inflammation, Chronic Active         |                                                             2            |             
      Acinus, Atrophy                      |    2              1                    1              1  1  1  3         |             
      Artery, Inflammation, Chronic Active | 3                                                                        |             
                                            __________________________________________________________________________|             
   Salivary Glands                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Stomach, Forestomach                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Inflammation, Chronic Active         |                3                                3  3           3  2      |             
      Epithelium, Hyperplasia              |                2                                3  2           2  2      |             
      Epithelium, Ulcer                    |                4                                4              2         |             
                                            __________________________________________________________________________|             
   Stomach, Glandular                      | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Inflammation, Chronic Active         |                                                                          |             
      Mineralization                       |          2                                                               |             
      Epithelium, Erosion                  |                               2                                          |             
      Epithelium, Ulcer                    |                                                                          |             
                                            __________________________________________________________________________|             
   Tongue                                  |                                                                   +      |             
 _____________________________________________________________________________________________________________________|             
 CARDIOVASCULAR SYSTEM                     |                                                                          |             
 _____________________________________________________________________________________________________________________|             

                                                             Page  34                                                               
NTP Experiment-Test: 89002-02                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09
Study Type: CHRONIC                                         PENTACHLOROPHENOL                                     Date: 08/19/97  
Route: DOSED FEED                                                                                                 Time: 11:06:29  
                                                                                                                                    
 _____________________________________________________________________________________________________________________              
                                           | 6| 6| 5| 7| 5| 7| 6| 5| 6| 7| 7| 7| 5| 6| 3| 7| 7| 5| 6| 6| 7| 7| 7| 7| 7|             
                             DAY ON TEST   | 4| 0| 6| 1| 6| 3| 1| 7| 4| 3| 3| 0| 3| 9| 9| 3| 1| 7| 6| 8| 3| 2| 0| 3| 3|             
                                           | 6| 0| 1| 5| 4| 3| 9| 6| 5| 6| 6| 3| 5| 5| 6| 6| 5| 9| 3| 4| 6| 4| 2| 6| 6|             
 _____________________________________________________________________________________________________________________|             
                                           | 0| 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 PPM                                  | 0| 0| 0| 0| 0| 0| 0| 0| 0| 1| 1| 1| 1| 1| 1| 1| 1| 2| 2| 2| 2| 2| 2| 2| 2|             
                                           | 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 2| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 7| 8|             
 _____________________________________________________________________________________________________________________|             
 CARDIOVASCULAR SYSTEM - cont              |                                                                          |             
                                           |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Blood Vessel                            | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Aorta, Mineralization                |          3                                                               |             
      Pulmonary Artery, Thrombosis         |                                                          4               |             
                                            __________________________________________________________________________|             
   Heart                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Cardiomyopathy, Chronic              | 1     2  2  2  2  2  2  2  2  2  2  2        2  2  2  2  2  2     2  2  2|             
      Atrium, Thrombosis                   |                4           2  2                                          |             
 _____________________________________________________________________________________________________________________|             
 ENDOCRINE SYSTEM                          |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Adrenal Cortex                          | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Atrophy                              |          3                                                               |             
      Degeneration, Cystic                 |                            2                                             |             
      Degeneration, Fatty                  |                         1  1  2     1  1  1  1  1  2  1        3  1  1   |             
      Hyperplasia                          | 1           2                          1     2     2              2      |             
      Necrosis                             |                2                                                         |             
                                            __________________________________________________________________________|             
   Adrenal Medulla                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Hyperplasia                          |          1     2              2              1              3     3     1|             
                                            __________________________________________________________________________|             
   Islets, Pancreatic                      | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Hyperplasia                          |                                                                          |             
                                            __________________________________________________________________________|             
   Parathyroid Gland                       | +  +  +  +  +  +  +  +  M  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Hyperplasia                          |          3                 2  2        2                 2        3     2|             
                                            __________________________________________________________________________|             
   Pituitary Gland                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Craniopharyngeal Duct, Cyst          |                                                                          |             
      Pars Distalis, Cyst                  |          3                                         2     2  1  2         |             
      Pars Distalis, Hyperplasia           |    2           3  3              2           2        2  2  1  2  2  2   |             
                                            __________________________________________________________________________|             
   Thyroid Gland                           | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      C-Cell, Hyperplasia                  | 2                 2              2              1  1           2  2  2   |             
      Follicular Cell, Hyperplasia, Cystic |                                              2                           |             
 _____________________________________________________________________________________________________________________|             
 GENERAL BODY SYSTEM                       |                                                                          |             
                                           |                                                                          |             
    None                                   |                                                                          |             
 _____________________________________________________________________________________________________________________|             
 GENITAL SYSTEM                            |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Coagulating Gland                       |                +                                +                        |             
      Inflammation, Chronic Active         |                4                                4                        |             
                                            __________________________________________________________________________|             
   Epididymis                              | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Preputial Gland                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Hyperplasia                          |                               4                             1           3|             
      Inflammation, Chronic Active         |    2     2     2  2     2  2  2  2  2  2  1  2  2  2  2  2  2  1  2  2  2|             
      Duct, Cyst                           |       2                                                                  |             
                                            __________________________________________________________________________|             
   Prostate                                | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Inflammation, Chronic Active         | 2  1     2  2  4  1  2  2        1  2  2  2  1  4  1  2  3        2  1  2|             
                                            __________________________________________________________________________|             
   Seminal Vesicle                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Testes                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
 _____________________________________________________________________________________________________________________|             

                                                             Page  35                                                               
NTP Experiment-Test: 89002-02                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09
Study Type: CHRONIC                                         PENTACHLOROPHENOL                                     Date: 08/19/97  
Route: DOSED FEED                                                                                                 Time: 11:06:29  
                                                                                                                                    
 _____________________________________________________________________________________________________________________              
                                           | 6| 6| 5| 7| 5| 7| 6| 5| 6| 7| 7| 7| 5| 6| 3| 7| 7| 5| 6| 6| 7| 7| 7| 7| 7|             
                             DAY ON TEST   | 4| 0| 6| 1| 6| 3| 1| 7| 4| 3| 3| 0| 3| 9| 9| 3| 1| 7| 6| 8| 3| 2| 0| 3| 3|             
                                           | 6| 0| 1| 5| 4| 3| 9| 6| 5| 6| 6| 3| 5| 5| 6| 6| 5| 9| 3| 4| 6| 4| 2| 6| 6|             
 _____________________________________________________________________________________________________________________|             
                                           | 0| 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 PPM                                  | 0| 0| 0| 0| 0| 0| 0| 0| 0| 1| 1| 1| 1| 1| 1| 1| 1| 2| 2| 2| 2| 2| 2| 2| 2|             
                                           | 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 2| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 7| 8|             
 _____________________________________________________________________________________________________________________|             
 GENITAL SYSTEM - cont                     |                                                                          |             
                                           |                                                                          |             
      Arteriole, Inflammation, Chronic     |                                                                          |             
      Germinal Epithelium, Atrophy         |                4                                                         |             
      Interstitial Cell, Hyperplasia       | 1              1     1  1     1  1  1                                    |             
 _____________________________________________________________________________________________________________________|             
 HEMATOPOIETIC SYSTEM                      |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Bone Marrow                             | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Hyperplasia                          |    4  4  4  3     4     4  3  4  4     4              4  4     4     3   |             
      Myelofibrosis                        |                                                          1               |             
                                            __________________________________________________________________________|             
   Lymph Node                              |                +  +     +        +     +  +  +  +     +  +  +     +      |             
      Mediastinal, Pigmentation,           |                                                                          |             
          Hemosiderin                      |                1  1     1        1        1  1  1     2  1  1     2      |             
                                            __________________________________________________________________________|             
   Lymph Node, Mandibular                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Hyperplasia, Plasma Cell             |                               2                                          |             
                                            __________________________________________________________________________|             
   Lymph Node, Mesenteric                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Infiltration Cellular, Histiocyte    |          3                                                               |             
                                            __________________________________________________________________________|             
   Spleen                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Fibrosis                             |                                                             2            |             
      Hematopoietic Cell Proliferation     |                               3                                4         |             
      Necrosis                             |                4                                                         |             
                                            __________________________________________________________________________|             
   Thymus                                  | +  +  +  +  +  +  +  +  +  +  +  +  M  +  +  +  +  +  +  +  +  +  +  +  +|             
 _____________________________________________________________________________________________________________________|             
 INTEGUMENTARY SYSTEM                      |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Mammary Gland                           | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Hyperplasia, Cystic                  | 3  1  2        3     1  2  2     2  3  2  3  2     1  2  2     2  2  1  2|             
                                            __________________________________________________________________________|             
   Skin                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Epidermis, Hyperplasia               |                                                       3                  |             
      Sebaceous Gland, Hyperplasia         |                                                       2                  |             
 _____________________________________________________________________________________________________________________|             
 MUSCULOSKELETAL SYSTEM                    |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Bone                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Fibrous Osteodystrophy               |          3                                                               |             
 _____________________________________________________________________________________________________________________|             
 NERVOUS SYSTEM                            |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Brain                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Hemorrhage                           |             4                                                            |             
 _____________________________________________________________________________________________________________________|             
 RESPIRATORY SYSTEM                        |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Lung                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Foreign Body                         |                      X                                                   |             
      Inflammation, Chronic Active         |                                                    1           1         |             
      Alveolar Epithelium, Hyperplasia     |                                                                          |             
      Alveolus, Infiltration Cellular,     |                                                                          |             
           Histiocyte                      | 1           1  1     1  1        1  1  1  1  1  1  1  1     1  1  1  1  1|             
                                            __________________________________________________________________________|             
   Nose                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
 _____________________________________________________________________________________________________________________|             

                                                             Page  36                                                               
NTP Experiment-Test: 89002-02                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09
Study Type: CHRONIC                                         PENTACHLOROPHENOL                                     Date: 08/19/97  
Route: DOSED FEED                                                                                                 Time: 11:06:29  
                                                                                                                                    
 _____________________________________________________________________________________________________________________              
                                           | 6| 6| 5| 7| 5| 7| 6| 5| 6| 7| 7| 7| 5| 6| 3| 7| 7| 5| 6| 6| 7| 7| 7| 7| 7|             
                             DAY ON TEST   | 4| 0| 6| 1| 6| 3| 1| 7| 4| 3| 3| 0| 3| 9| 9| 3| 1| 7| 6| 8| 3| 2| 0| 3| 3|             
                                           | 6| 0| 1| 5| 4| 3| 9| 6| 5| 6| 6| 3| 5| 5| 6| 6| 5| 9| 3| 4| 6| 4| 2| 6| 6|             
 _____________________________________________________________________________________________________________________|             
                                           | 0| 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 PPM                                  | 0| 0| 0| 0| 0| 0| 0| 0| 0| 1| 1| 1| 1| 1| 1| 1| 1| 2| 2| 2| 2| 2| 2| 2| 2|             
                                           | 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 2| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 7| 8|             
 _____________________________________________________________________________________________________________________|             
 RESPIRATORY SYSTEM - cont                 |                                                                          |             
                                           |                                                                          |             
      Fungus                               |    X  X     X        X              X     X        X        X  X        X|             
      Inflammation, Chronic Active         |    2  3     2        2     2        2     2     1  2        3  4        3|             
      Nasolacrimal Duct, Inflammation,     |                                                                          |             
           Suppurative                     |          2     3                                2                        |             
      Respiratory Epithelium, Hyperplasia  |    3        2        2     2        2     2     1  2        3  3        3|             
      Respiratory Epithelium, Metaplasia,  |                                                                          |             
           Squamous                        |    2        2        2                    2        2           2        2|             
                                            __________________________________________________________________________|             
   Trachea                                 | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
 _____________________________________________________________________________________________________________________|             
 SPECIAL SENSES SYSTEM                     |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Eye                                     |                                           +                              |             
      Lens, Cataract                       |                                           4                              |             
      Retina, Atrophy                      |                                           4                              |             
 _____________________________________________________________________________________________________________________|             
 URINARY SYSTEM                            |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Kidney                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Cyst                                 |                                                                          |             
      Nephropathy, Chronic                 | 2  2  2  4  2  3  1  2  2  4  3  3  3  3  2  3  4  4  2  4  3  2  4  2  3|             
      Renal Tubule, Hyperplasia            |                                        3                                 |             
      Renal Tubule, Pigmentation           | 1  1  3  1  1  2  1  1  1  1  1  2  1  1  1  1  1  1  1  1  1  1  1  1  1|             
                                            __________________________________________________________________________|             
   Urinary Bladder                         | M  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Inflammation, Chronic Active         |                                                                          |             
 _____________________________________________________________________________________________________________________|             

                                                             Page  37                                                               
NTP Experiment-Test: 89002-02                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09
Study Type: CHRONIC                                         PENTACHLOROPHENOL                                     Date: 08/19/97  
Route: DOSED FEED                                                                                                 Time: 11:06:29  
                                                                                                                                    
 __________________________________________________________________________________________________________________________________ 
                                           | 5| 6| 6| 7| 7| 6| 4| 7| 6| 7| 7| 4| 7| 6| 7| 6| 6| 7| 6| 6| 6| 3| 7| 6| 6|            |
                             DAY ON TEST   | 9| 8| 8| 3| 3| 9| 3| 3| 6| 3| 2| 2| 3| 9| 3| 4| 4| 3| 9| 0| 1| 9| 2| 7| 0|            |
                                           | 3| 1| 4| 6| 6| 8| 5| 3| 0| 7| 9| 0| 7| 8| 7| 7| 3| 7| 0| 0| 7| 6| 2| 5| 3|      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 PPM                                  | 2| 3| 3| 3| 3| 3| 3| 3| 4| 4| 4| 4| 4| 4| 4| 4| 5| 5| 5| 5| 5| 5| 5| 5| 6|      L     |
                                           | 9| 0| 1| 2| 5| 6| 7| 8| 0| 1| 2| 3| 4| 5| 6| 8| 0| 1| 3| 4| 5| 6| 8| 9| 0|            |
 __________________________________________________________________________________________________________________________________ 
 ALIMENTARY SYSTEM                         |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Esophagus                               | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
                                            __________________________________________________________________________|____________|
   Intestine Large, Colon                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Parasite Metazoan                    |                                                                          |      1     |
                                            __________________________________________________________________________|____________|
   Intestine Large, Rectum                 | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Parasite Metazoan                    |                                                 X                        |      1     |
                                            __________________________________________________________________________|____________|
   Intestine Large, Cecum                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
                                            __________________________________________________________________________|____________|
   Intestine Small, Duodenum               | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Epithelium, Erosion                  |                                                                          |      1  3.0|
                                            __________________________________________________________________________|____________|
   Intestine Small, Jejunum                | +  +  +  +  +  +  +  +  +  +  +  A  +  +  +  +  +  +  +  +  +  +  +  +  +|  49        |
                                            __________________________________________________________________________|____________|
   Intestine Small, Ileum                  | +  +  +  +  +  +  +  +  +  +  +  +  +  M  +  +  +  +  +  +  +  +  +  +  +|  49        |
                                            __________________________________________________________________________|____________|
   Liver                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Angiectasis                          |                                              3                           |      2  2.0|
      Basophilic Focus                     |             X              X  X     X     X        X           X     X   |     17     |
      Clear Cell Focus                     |             X                       X     X        X                     |      6     |
      Eosinophilic Focus                   |                               X                                          |      2     |
      Inflammation, Chronic                |             1     2           1     1     1        1     1  2  1         |     22  1.2|
      Mixed Cell Focus                     |                                           X                              |      1     |
      Bile Duct, Hyperplasia               | 2  2  3  3  2  2  1  3  2  2  2  1  2  2  2  3  3  2  3  1  1  1  3  2  2|     49  1.9|
      Hepatocyte, Degeneration, Cystic     |          2              1              2     2        1  1        2      |     16  1.8|
      Hepatocyte, Necrosis                 |       2                                                     2            |      3  1.7|
      Hepatocyte, Vacuolization Cytoplasmic|    1                                                     3  2  1     2   |     10  1.4|
      Hepatocyte, Centrilobular,           |                                                                          |            |
          Degeneration                     |                                                             3            |      2  2.0|
      Hepatocyte, Centrilobular, Necrosis  |                               2                                          |      2  3.0|
      Kupffer Cell, Hypertrophy            |                                                                          |      1  1.0|
                                            __________________________________________________________________________|____________|
   Mesentery                               | +        +              +  +  +              +  +     +     +     +  +  +|  15        |
      Fat, Necrosis                        | 4        4              4  4  4              4        4     4           4|     12  4.0|
                                            __________________________________________________________________________|____________|
   Oral Mucosa                             |                                                                          |   1        |
                                            __________________________________________________________________________|____________|
   Pancreas                                | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Inflammation, Chronic Active         |                                                                          |      1  2.0|
      Acinus, Atrophy                      |       1     2                 1           1        1                     |     12  1.3|
      Artery, Inflammation, Chronic Active |                                                                          |      1  3.0|
                                            __________________________________________________________________________|____________|
   Salivary Glands                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
                                            __________________________________________________________________________|____________|
   Stomach, Forestomach                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Inflammation, Chronic Active         |    3  2              1                                   3        3      |     10  2.6|
      Epithelium, Hyperplasia              |    2  1                                                  3               |      8  2.1|
      Epithelium, Ulcer                    |    4  4              1                                   4        4      |      8  3.4|
                                            __________________________________________________________________________|____________|
   Stomach, Glandular                      | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Inflammation, Chronic Active         |       2                                                                  |      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  38                                                               
NTP Experiment-Test: 89002-02                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09
Study Type: CHRONIC                                         PENTACHLOROPHENOL                                     Date: 08/19/97  
Route: DOSED FEED                                                                                                 Time: 11:06:29  
                                                                                                                                    
 __________________________________________________________________________________________________________________________________ 
                                           | 5| 6| 6| 7| 7| 6| 4| 7| 6| 7| 7| 4| 7| 6| 7| 6| 6| 7| 6| 6| 6| 3| 7| 6| 6|            |
                             DAY ON TEST   | 9| 8| 8| 3| 3| 9| 3| 3| 6| 3| 2| 2| 3| 9| 3| 4| 4| 3| 9| 0| 1| 9| 2| 7| 0|            |
                                           | 3| 1| 4| 6| 6| 8| 5| 3| 0| 7| 9| 0| 7| 8| 7| 7| 3| 7| 0| 0| 7| 6| 2| 5| 3|      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 PPM                                  | 2| 3| 3| 3| 3| 3| 3| 3| 4| 4| 4| 4| 4| 4| 4| 4| 5| 5| 5| 5| 5| 5| 5| 5| 6|      L     |
                                           | 9| 0| 1| 2| 5| 6| 7| 8| 0| 1| 2| 3| 4| 5| 6| 8| 0| 1| 3| 4| 5| 6| 8| 9| 0|            |
 __________________________________________________________________________________________________________________________________ 
 ALIMENTARY SYSTEM - cont                  |                                                                          |            |
                                           |                                                                          |            |
      Mineralization                       |                                                                          |      1  2.0|
      Epithelium, Erosion                  |                                                                         2|      2  2.0|
      Epithelium, Ulcer                    |       4                                                                  |      1  4.0|
                                            __________________________________________________________________________|____________|
   Tongue                                  |                                                                          |   1        |
 _____________________________________________________________________________________________________________________|            |
 CARDIOVASCULAR SYSTEM                     |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Blood Vessel                            | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Aorta, Mineralization                |                                                                          |      1  3.0|
      Pulmonary Artery, Thrombosis         |                                                                          |      1  4.0|
                                            __________________________________________________________________________|____________|
   Heart                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Cardiomyopathy, Chronic              | 1  2  1  2  2  2     3  2  3  2  2  2  2  2  2  2  2     2  2  1     2   |     42  2.0|
      Atrium, Thrombosis                   |       3  2           4                 3                                 |      7  2.9|
 _____________________________________________________________________________________________________________________|            |
 ENDOCRINE SYSTEM                          |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Adrenal Cortex                          | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Atrophy                              |                                                                          |      1  3.0|
      Degeneration, Cystic                 |                                                                          |      1  2.0|
      Degeneration, Fatty                  | 1  3  1  1     2  1        2  1        2  1        1  2  2     1        2|     28  1.4|
      Hyperplasia                          | 2  2  1     1              1                       1     1               |     13  1.5|
      Necrosis                             |                                                                          |      1  2.0|
                                            __________________________________________________________________________|____________|
   Adrenal Medulla                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Hyperplasia                          |    2     1  1  1     2  1     1        1     1        2           2      |     18  1.6|
                                            __________________________________________________________________________|____________|
   Islets, Pancreatic                      | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Hyperplasia                          |             2                             3                              |      2  2.5|
                                            __________________________________________________________________________|____________|
   Parathyroid Gland                       | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  M  +  +  +  M  +|  47        |
      Hyperplasia                          |    2                                                  2                  |      9  2.2|
                                            __________________________________________________________________________|____________|
   Pituitary Gland                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Craniopharyngeal Duct, Cyst          |             1                                                            |      1  1.0|
      Pars Distalis, Cyst                  |                                           2        1                     |      7  1.9|
      Pars Distalis, Hyperplasia           | 1     1     1           1     2     1  1     1     1  2              2   |     22  1.7|
                                            __________________________________________________________________________|____________|
   Thyroid Gland                           | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      C-Cell, Hyperplasia                  |    1     2  2  1           1                 2     1                    2|     16  1.6|
      Follicular Cell, Hyperplasia, Cystic |                                                                          |      1  2.0|
 _____________________________________________________________________________________________________________________|            |
 GENERAL BODY SYSTEM                       |                                                                          |            |
                                           |                                                                          |            |
    None                                   |                                                                          |            |
 _____________________________________________________________________________________________________________________|            |
 GENITAL SYSTEM                            |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Coagulating Gland                       |                                                                          |   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  39                                                               
NTP Experiment-Test: 89002-02                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09
Study Type: CHRONIC                                         PENTACHLOROPHENOL                                     Date: 08/19/97  
Route: DOSED FEED                                                                                                 Time: 11:06:29  
                                                                                                                                    
 __________________________________________________________________________________________________________________________________ 
                                           | 5| 6| 6| 7| 7| 6| 4| 7| 6| 7| 7| 4| 7| 6| 7| 6| 6| 7| 6| 6| 6| 3| 7| 6| 6|            |
                             DAY ON TEST   | 9| 8| 8| 3| 3| 9| 3| 3| 6| 3| 2| 2| 3| 9| 3| 4| 4| 3| 9| 0| 1| 9| 2| 7| 0|            |
                                           | 3| 1| 4| 6| 6| 8| 5| 3| 0| 7| 9| 0| 7| 8| 7| 7| 3| 7| 0| 0| 7| 6| 2| 5| 3|      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 PPM                                  | 2| 3| 3| 3| 3| 3| 3| 3| 4| 4| 4| 4| 4| 4| 4| 4| 5| 5| 5| 5| 5| 5| 5| 5| 6|      L     |
                                           | 9| 0| 1| 2| 5| 6| 7| 8| 0| 1| 2| 3| 4| 5| 6| 8| 0| 1| 3| 4| 5| 6| 8| 9| 0|            |
 __________________________________________________________________________________________________________________________________ 
 GENITAL SYSTEM - cont                     |                                                                          |            |
                                           |                                                                          |            |
      Inflammation, Chronic Active         |                                                                          |      2  4.0|
                                            __________________________________________________________________________|____________|
   Epididymis                              | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
                                            __________________________________________________________________________|____________|
   Preputial Gland                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Hyperplasia                          |          2                          3                          2     2   |      7  2.4|
      Inflammation, Chronic Active         | 2  2  1  2  2  2     3  1  2  2  1  3  2  2     2  2  2  2  2     2  2   |     42  1.9|
      Duct, Cyst                           |                      4                                                   |      2  3.0|
                                            __________________________________________________________________________|____________|
   Prostate                                | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Inflammation, Chronic Active         | 1  2  1  2  1  2  2  1     2     2  1     2     1     2  2     2  2     1|     38  1.8|
                                            __________________________________________________________________________|____________|
   Seminal Vesicle                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
                                            __________________________________________________________________________|____________|
   Testes                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Arteriole, Inflammation, Chronic     |          2                                                               |      1  2.0|
      Germinal Epithelium, Atrophy         |          2                                                               |      2  3.0|
      Interstitial Cell, Hyperplasia       |          2        2                                                     1|     10  1.2|
 _____________________________________________________________________________________________________________________|            |
 HEMATOPOIETIC SYSTEM                      |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Bone Marrow                             | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Hyperplasia                          | 4     4  4     4     4  4     4        3     4     3  4     3  4  3  4  4|     30  3.8|
      Myelofibrosis                        |                                                                          |      1  1.0|
                                            __________________________________________________________________________|____________|
   Lymph Node                              | +  +  +  +  +  +  +  +  +  +  +     +  +     +  +  +  +  +  +     +  +  +|  34        |
      Mediastinal, Pigmentation,           |                                                                          |            |
          Hemosiderin                      |    1  2     1     1  1  2     1     1  1     1     2     1  1           1|     25  1.2|
                                            __________________________________________________________________________|____________|
   Lymph Node, Mandibular                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Hyperplasia, Plasma Cell             |                                                                          |      1  2.0|
                                            __________________________________________________________________________|____________|
   Lymph Node, Mesenteric                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Infiltration Cellular, Histiocyte    |                                                                          |      1  3.0|
                                            __________________________________________________________________________|____________|
   Spleen                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Fibrosis                             |             2              3        1                                   2|      5  2.0|
      Hematopoietic Cell Proliferation     |                                                             2  2         |      4  2.8|
      Necrosis                             |                                                       4                  |      2  4.0|
                                            __________________________________________________________________________|____________|
   Thymus                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  49        |
 _____________________________________________________________________________________________________________________|            |
 INTEGUMENTARY SYSTEM                      |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Mammary Gland                           | +  +  +  +  +  +  +  +  M  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  49        |
      Hyperplasia, Cystic                  | 2  3  2  3     3     2     2  1  2  1  2  3           2  3        2  2  2|     36  2.1|
                                            __________________________________________________________________________|____________|
   Skin                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Epidermis, Hyperplasia               |                                                                          |      1  3.0|
      Sebaceous Gland, Hyperplasia         |                                                                          |      1  2.0|
 _____________________________________________________________________________________________________________________|            |
 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  40                                                               
NTP Experiment-Test: 89002-02                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09
Study Type: CHRONIC                                         PENTACHLOROPHENOL                                     Date: 08/19/97  
Route: DOSED FEED                                                                                                 Time: 11:06:29  
                                                                                                                                    
 __________________________________________________________________________________________________________________________________ 
                                           | 5| 6| 6| 7| 7| 6| 4| 7| 6| 7| 7| 4| 7| 6| 7| 6| 6| 7| 6| 6| 6| 3| 7| 6| 6|            |
                             DAY ON TEST   | 9| 8| 8| 3| 3| 9| 3| 3| 6| 3| 2| 2| 3| 9| 3| 4| 4| 3| 9| 0| 1| 9| 2| 7| 0|            |
                                           | 3| 1| 4| 6| 6| 8| 5| 3| 0| 7| 9| 0| 7| 8| 7| 7| 3| 7| 0| 0| 7| 6| 2| 5| 3|      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 PPM                                  | 2| 3| 3| 3| 3| 3| 3| 3| 4| 4| 4| 4| 4| 4| 4| 4| 5| 5| 5| 5| 5| 5| 5| 5| 6|      L     |
                                           | 9| 0| 1| 2| 5| 6| 7| 8| 0| 1| 2| 3| 4| 5| 6| 8| 0| 1| 3| 4| 5| 6| 8| 9| 0|            |
 __________________________________________________________________________________________________________________________________ 
 MUSCULOSKELETAL SYSTEM - cont             |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Bone                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Fibrous Osteodystrophy               |                                                                          |      1  3.0|
 _____________________________________________________________________________________________________________________|            |
 NERVOUS SYSTEM                            |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Brain                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Hemorrhage                           |                                                 4     2                 4|      4  3.5|
 _____________________________________________________________________________________________________________________|            |
 RESPIRATORY SYSTEM                        |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Lung                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Foreign Body                         |                                                                          |      1     |
      Inflammation, Chronic Active         |                                                                1         |      3  1.0|
      Alveolar Epithelium, Hyperplasia     |                                                    1                     |      1  1.0|
      Alveolus, Infiltration Cellular,     |                                                                          |            |
           Histiocyte                      | 1  1  1  1  1  1        1  1  1     1  1  1  1  1  1  1     1  1  1  1  1|     39  1.0|
                                            __________________________________________________________________________|____________|
   Nose                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Fungus                               |             X  X     X     X  X     X           X  X     X        X  X   |     21     |
      Inflammation, Chronic Active         |             2  2     2     2  4     2  2        4  2     2        3  3  2|     25  2.4|
      Nasolacrimal Duct, Inflammation,     |                                                                          |            |
           Suppurative                     |    1     1                                                  1            |      6  1.7|
      Respiratory Epithelium, Hyperplasia  |    2        3  3     2     3  3     3  2           3     2        3  3  1|     24  2.4|
      Respiratory Epithelium, Metaplasia,  |                                                                          |            |
           Squamous                        |                               2        2                 2           3  2|     12  2.1|
                                            __________________________________________________________________________|____________|
   Trachea                                 | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
 _____________________________________________________________________________________________________________________|            |
 SPECIAL SENSES SYSTEM                     |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Eye                                     |                                                                          |   1        |
      Lens, Cataract                       |                                                                          |      1  4.0|
      Retina, Atrophy                      |                                                                          |      1  4.0|
 _____________________________________________________________________________________________________________________|            |
 URINARY SYSTEM                            |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Kidney                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Cyst                                 |    2                                                                     |      1  2.0|
      Nephropathy, Chronic                 | 1  4  2  2  3  2  2  3  1  2  3  1  2  3  2  2  1  2  2  4  1  1  3  2  2|     50  2.4|
      Renal Tubule, Hyperplasia            |                                                                          |      1  3.0|
      Renal Tubule, Pigmentation           | 1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1     1  1  1  3  1  1  1  1|     49  1.1|
                                            __________________________________________________________________________|____________|
   Urinary Bladder                         | +  +  +  +  +  +  +  +  +  +  +  +  +  M  +  +  +  +  +  +  +  +  +  +  +|  48        |
      Inflammation, Chronic Active         |                               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  41                                                               
NTP Experiment-Test: 89002-02                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09
Study Type: CHRONIC                                         PENTACHLOROPHENOL                                     Date: 08/19/97  
Route: DOSED FEED                                                                                                 Time: 11:06:29  
                                                                                                                                    
 _____________________________________________________________________________________________________________________              
                                           | 7| 4| 7| 4| 7| 6| 7| 6| 6| 7| 5| 5| 4| 5| 5| 5| 6| 7| 6| 6| 6| 7| 5| 6| 7|             
                             DAY ON TEST   | 3| 1| 3| 2| 2| 4| 3| 0| 8| 3| 6| 6| 5| 4| 2| 0| 6| 2| 1| 3| 3| 2| 7| 1| 0|             
                                           | 7| 0| 7| 8| 2| 9| 7| 5| 4| 7| 3| 3| 0| 4| 4| 5| 0| 3| 4| 1| 4| 6| 9| 9| 8|             
 _____________________________________________________________________________________________________________________|             
                                           | 0| 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|             
    200 PPM                                | 6| 6| 6| 6| 6| 6| 6| 6| 6| 7| 7| 7| 7| 7| 7| 7| 7| 7| 7| 8| 8| 8| 8| 8| 8|             
                                           | 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                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Parasite Metazoan                    |    X                                                                     |             
                                            __________________________________________________________________________|             
   Intestine Large, Rectum                 | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Parasite Metazoan                    |                               X                 X              X         |             
                                            __________________________________________________________________________|             
   Intestine Large, Cecum                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Intestine Small, Duodenum               | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Intestine Small, Jejunum                | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Intestine Small, Ileum                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Liver                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Basophilic Focus                     | X              X  X        X  X                                          |             
      Clear Cell Focus                     |                                                                          |             
      Eosinophilic Focus                   | X              X                                                         |             
      Hepatodiaphragmatic Nodule           |                                              X           X              X|             
      Inflammation, Chronic                | 2        1     1                          1                              |             
      Bile Duct, Hyperplasia               | 2  1  3  1  2  3  2  2  2  2  2  2  2     1  1  3     3  1  2  2  3  2   |             
      Hepatocyte, Degeneration, Cystic     | 2     2           2  1     1           1        2              1         |             
      Hepatocyte, Vacuolization Cytoplasmic|                                     1  3           1                     |             
      Hepatocyte, Centrilobular,           |                                                                          |             
          Degeneration                     |                                                                3         |             
      Hepatocyte, Centrilobular, Necrosis  |    4        2                                      2     3               |             
      Oval Cell, Hyperplasia               |                                                    1                     |             
                                            __________________________________________________________________________|             
   Mesentery                               |                +     +  +     +        +                       +  +  +   |             
      Fat, Necrosis                        |                4     4  4     4        4                       4         |             
                                            __________________________________________________________________________|             
   Oral Mucosa                             |                                                                          |             
      Pharyngeal, Necrosis                 |                                                                          |             
                                            __________________________________________________________________________|             
   Pancreas                                | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Acinus, Atrophy                      | 2     1  1  4  3        1  1  1                 1  2  1  1  1            |             
                                            __________________________________________________________________________|             
   Salivary Glands                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Stomach, Forestomach                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Inflammation, Chronic Active         |                         2  1           2              2                  |             
      Epithelium, Hyperplasia              |       2                 2  3           3              2              2   |             
      Epithelium, Ulcer                    |                            1           4                             3   |             
                                            __________________________________________________________________________|             
   Stomach, Glandular                      | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Epithelium, Erosion                  |                                                       2                  |             
 _____________________________________________________________________________________________________________________|             
 CARDIOVASCULAR SYSTEM                     |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Blood Vessel                            | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Heart                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Cardiomyopathy, Chronic              | 2  2  2  1  2  2  2  2  2  2        2  2  2  2  2  1  2  2  2  2        2|             
      Atrium, Thrombosis                   |                3           3           1           4           4         |             
 _____________________________________________________________________________________________________________________|             
 ENDOCRINE SYSTEM                          |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Adrenal Cortex                          | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
 _____________________________________________________________________________________________________________________|             

                                                             Page  42                                                               
NTP Experiment-Test: 89002-02                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09
Study Type: CHRONIC                                         PENTACHLOROPHENOL                                     Date: 08/19/97  
Route: DOSED FEED                                                                                                 Time: 11:06:29  
                                                                                                                                    
 _____________________________________________________________________________________________________________________              
                                           | 7| 4| 7| 4| 7| 6| 7| 6| 6| 7| 5| 5| 4| 5| 5| 5| 6| 7| 6| 6| 6| 7| 5| 6| 7|             
                             DAY ON TEST   | 3| 1| 3| 2| 2| 4| 3| 0| 8| 3| 6| 6| 5| 4| 2| 0| 6| 2| 1| 3| 3| 2| 7| 1| 0|             
                                           | 7| 0| 7| 8| 2| 9| 7| 5| 4| 7| 3| 3| 0| 4| 4| 5| 0| 3| 4| 1| 4| 6| 9| 9| 8|             
 _____________________________________________________________________________________________________________________|             
                                           | 0| 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|             
    200 PPM                                | 6| 6| 6| 6| 6| 6| 6| 6| 6| 7| 7| 7| 7| 7| 7| 7| 7| 7| 7| 8| 8| 8| 8| 8| 8|             
                                           | 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                   |                                                                          |             
                                           |                                                                          |             
      Degeneration, Cystic                 |                   2                                                      |             
      Degeneration, Fatty                  |                   1     2              3              3  2  1  2     3  1|             
      Hyperplasia                          | 2                                         2              2  2            |             
      Hypertrophy                          |                                                                      3   |             
                                            __________________________________________________________________________|             
   Adrenal Medulla                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Degeneration, Fatty                  |                                                          2               |             
      Hyperplasia                          |                1  1  1  3  2  1  2                 3  1  2  3  2  2  1   |             
                                            __________________________________________________________________________|             
   Islets, Pancreatic                      | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Parathyroid Gland                       | +  +  +  +  +  +  +  +  +  +  M  +  +  +  +  M  +  +  +  +  +  M  +  +  +|             
      Hyperplasia                          |                                        3                                 |             
                                            __________________________________________________________________________|             
   Pituitary Gland                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Pars Distalis, Cyst                  |       3                          2                                       |             
      Pars Distalis, Hyperplasia           |             1  1     2                             2           2  3     2|             
      Pars Intermedia, Cyst                |                                                                         1|             
                                            __________________________________________________________________________|             
   Thyroid Gland                           | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Ultimobranchial Cyst                 |                                                                          |             
      C-Cell, Hyperplasia                  |       1           1                    2        1                        |             
      Follicle, Cyst                       |                                                                          |             
 _____________________________________________________________________________________________________________________|             
 GENERAL BODY SYSTEM                       |                                                                          |             
                                           |                                                                          |             
    None                                   |                                                                          |             
 _____________________________________________________________________________________________________________________|             
 GENITAL SYSTEM                            |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Coagulating Gland                       |                                                                          |             
      Inflammation, Chronic Active         |                                                                          |             
                                            __________________________________________________________________________|             
   Epididymis                              | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Granuloma Sperm                      |                         2                                                |             
                                            __________________________________________________________________________|             
   Preputial Gland                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Hyperplasia                          |       3           2              4                                       |             
      Inflammation, Chronic Active         | 2  1     1  1  2     2  2  2  2  2              2  2  1  2  2     2  2  2|             
                                            __________________________________________________________________________|             
   Prostate                                | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Inflammation, Chronic Active         |    1     2  2  1     2     3  2  1  1     2        1     3  2     1  1  2|             
      Epithelium, Hyperplasia              |                                                                          |             
                                            __________________________________________________________________________|             
   Seminal Vesicle                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Testes                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Germinal Epithelium, Atrophy         |                                        4                                 |             
      Interstitial Cell, Hyperplasia       |                               1              1           1  1     1      |             
 _____________________________________________________________________________________________________________________|             
 HEMATOPOIETIC SYSTEM                      |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Bone Marrow                             | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Atrophy, Focal                       |                                                 4                        |             
      Atrophy                              |                                                                          |             
      Hyperplasia                          | 3     3        3  4  4  4  3  4  4              4  4  4     4  4  4  4  4|             
      Myelofibrosis                        |                                                    2                     |             
 _____________________________________________________________________________________________________________________|             

                                                             Page  43                                                               
NTP Experiment-Test: 89002-02                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09
Study Type: CHRONIC                                         PENTACHLOROPHENOL                                     Date: 08/19/97  
Route: DOSED FEED                                                                                                 Time: 11:06:29  
                                                                                                                                    
 _____________________________________________________________________________________________________________________              
                                           | 7| 4| 7| 4| 7| 6| 7| 6| 6| 7| 5| 5| 4| 5| 5| 5| 6| 7| 6| 6| 6| 7| 5| 6| 7|             
                             DAY ON TEST   | 3| 1| 3| 2| 2| 4| 3| 0| 8| 3| 6| 6| 5| 4| 2| 0| 6| 2| 1| 3| 3| 2| 7| 1| 0|             
                                           | 7| 0| 7| 8| 2| 9| 7| 5| 4| 7| 3| 3| 0| 4| 4| 5| 0| 3| 4| 1| 4| 6| 9| 9| 8|             
 _____________________________________________________________________________________________________________________|             
                                           | 0| 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|             
    200 PPM                                | 6| 6| 6| 6| 6| 6| 6| 6| 6| 7| 7| 7| 7| 7| 7| 7| 7| 7| 7| 8| 8| 8| 8| 8| 8|             
                                           | 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                              |       +        +  +  +     +  +  +     +  +     +     +     +  +  +  +  +|             
      Lumbar, Hyperplasia, Lymphoid        |                      2                                                   |             
      Mediastinal, Hyperplasia, Lymphoid   |                                                                          |             
      Mediastinal, Pigmentation,           |                                                                          |             
          Hemosiderin                      |                2                       1  1     1     1     1  1         |             
                                            __________________________________________________________________________|             
   Lymph Node, Mandibular                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Lymph Node, Mesenteric                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Erythrophagocytosis                  |                                                    3                     |             
                                            __________________________________________________________________________|             
   Spleen                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Fibrosis                             |                                                    3                     |             
                                            __________________________________________________________________________|             
   Thymus                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  M  +  +  +  +  +  +|             
      Ectopic Parathyroid Gland            |                                                                         2|             
 _____________________________________________________________________________________________________________________|             
 INTEGUMENTARY SYSTEM                      |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Mammary Gland                           | +  M  +  +  +  +  +  M  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Hyperplasia, Cystic                  |       3     1     2     2  2  2        4  2     2     2  2  2  4  1  1  2|             
                                            __________________________________________________________________________|             
   Skin                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Cyst Epithelial Inclusion            |                                                                          |             
      Inflammation, Granulomatous          |                                                                          |             
      Epidermis, Hyperkeratosis            |                                                                4         |             
 _____________________________________________________________________________________________________________________|             
 MUSCULOSKELETAL SYSTEM                    |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Bone                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Osteopetrosis                        |                                                       2                  |             
                                            __________________________________________________________________________|             
   Skeletal Muscle                         |                                                                      +   |             
 _____________________________________________________________________________________________________________________|             
 NERVOUS SYSTEM                            |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Brain                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Necrosis                             |                                                                          |             
 _____________________________________________________________________________________________________________________|             
 RESPIRATORY SYSTEM                        |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Lung                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Alveolar Epithelium, Hyperplasia     |                                                                          |             
      Alveolus, Infiltration Cellular,     |                                                                          |             
           Histiocyte                      | 1              1  1  1  1  1  1  1     1        2  1  1  1  1  1  2  1  1|             
                                            __________________________________________________________________________|             
   Nose                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Fungus                               | X           X     X  X  X           X           X     X  X  X           X|             
      Inflammation, Chronic Active         | 2           3     3  2  2           2           3     3  4  3           2|             
      Nasolacrimal Duct, Inflammation,     |                                                                          |             
           Suppurative                     |                            1                       2     3              2|             
      Respiratory Epithelium, Hyperplasia  | 3           2     3  2  2                       3     3  3  3           2|             
      Respiratory Epithelium, Metaplasia,  |                                                                          |             
           Squamous                        | 2                    2  3           2           3           3            |             
                                            __________________________________________________________________________|             
   Trachea                                 | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
 _____________________________________________________________________________________________________________________|             

                                                             Page  44                                                               
NTP Experiment-Test: 89002-02                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09
Study Type: CHRONIC                                         PENTACHLOROPHENOL                                     Date: 08/19/97  
Route: DOSED FEED                                                                                                 Time: 11:06:29  
                                                                                                                                    
 _____________________________________________________________________________________________________________________              
                                           | 7| 4| 7| 4| 7| 6| 7| 6| 6| 7| 5| 5| 4| 5| 5| 5| 6| 7| 6| 6| 6| 7| 5| 6| 7|             
                             DAY ON TEST   | 3| 1| 3| 2| 2| 4| 3| 0| 8| 3| 6| 6| 5| 4| 2| 0| 6| 2| 1| 3| 3| 2| 7| 1| 0|             
                                           | 7| 0| 7| 8| 2| 9| 7| 5| 4| 7| 3| 3| 0| 4| 4| 5| 0| 3| 4| 1| 4| 6| 9| 9| 8|             
 _____________________________________________________________________________________________________________________|             
                                           | 0| 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|             
    200 PPM                                | 6| 6| 6| 6| 6| 6| 6| 6| 6| 7| 7| 7| 7| 7| 7| 7| 7| 7| 7| 8| 8| 8| 8| 8| 8|             
                                           | 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                 |                                                                          |             
                                           |                                                                          |             
 _____________________________________________________________________________________________________________________|             
 SPECIAL SENSES SYSTEM                     |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Eye                                     |                            +                                            +|             
      Lens, Cataract                       |                            3                                             |             
      Retina, Atrophy                      |                            3                                            3|             
      Retina, Hemorrhage                   |                                                                         2|             
      Sclera, Metaplasia, Osseous          |                                                                         2|             
 _____________________________________________________________________________________________________________________|             
 URINARY SYSTEM                            |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Kidney                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Accumulation, Hyaline Droplet        |                                                                          |             
      Cyst                                 |                                                                          |             
      Nephropathy, Chronic                 | 2  2  2  2  1  2  2  1  2  2  2  2  1  4  2     2  2  2  2  1  2  1  2  2|             
      Renal Tubule, Pigmentation           | 1  1  1  1  1  1  2     1  1  1  1     1  1  1  2  1  2  1  1  1  3  1  1|             
                                            __________________________________________________________________________|             
   Urinary Bladder                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
 _____________________________________________________________________________________________________________________|             

                                                             Page  45                                                               
NTP Experiment-Test: 89002-02                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09
Study Type: CHRONIC                                         PENTACHLOROPHENOL                                     Date: 08/19/97  
Route: DOSED FEED                                                                                                 Time: 11:06:29  
                                                                                                                                    
 __________________________________________________________________________________________________________________________________ 
                                           | 5| 7| 5| 6| 7| 6| 7| 5| 7| 7| 5| 4| 7| 7| 7| 7| 6| 7| 7| 7| 6| 7| 7| 6| 6|            |
                             DAY ON TEST   | 3| 3| 0| 4| 2| 6| 3| 9| 3| 3| 4| 3| 3| 3| 3| 3| 6| 3| 3| 0| 1| 3| 3| 9| 9|            |
                                           | 4| 7| 7| 7| 3| 3| 7| 2| 7| 7| 4| 5| 7| 7| 7| 7| 3| 7| 7| 2| 9| 7| 7| 8| 8|      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| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1|      A     |
    200 PPM                                | 8| 8| 8| 8| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 1|      L     |
                                           | 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                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Parasite Metazoan                    |       X                                                     X            |      3     |
                                            __________________________________________________________________________|____________|
   Intestine Large, Rectum                 | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Parasite Metazoan                    |       X                       X                                          |      5     |
                                            __________________________________________________________________________|____________|
   Intestine Large, Cecum                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
                                            __________________________________________________________________________|____________|
   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         |     14     |
      Clear Cell Focus                     |                            X        X                                    |      2     |
      Eosinophilic Focus                   |                                                                          |      2     |
      Hepatodiaphragmatic Nodule           |                X        X                 X           X                  |      7     |
      Inflammation, Chronic                |    1           1     1     2  1  1  2     1  1     1           1  1      |     16  1.2|
      Bile Duct, Hyperplasia               | 3  2  2  3  2  1  2  1  3  2  1  1  1  2  2  2  3  2  2  3  3  2  2  3  3|     47  2.1|
      Hepatocyte, Degeneration, Cystic     |       1        1  1  1  2                 1  1  1  1     1     1  2  1  2|     22  1.3|
      Hepatocyte, Vacuolization Cytoplasmic|                                                                          |      3  1.7|
      Hepatocyte, Centrilobular,           |                                                                          |            |
          Degeneration                     |                                                                          |      1  3.0|
      Hepatocyte, Centrilobular, Necrosis  |                                                                          |      4  2.8|
      Oval Cell, Hyperplasia               |                                                                          |      1  1.0|
                                            __________________________________________________________________________|____________|
   Mesentery                               | +                                                              +     +  +|  12        |
      Fat, Necrosis                        | 4                                                                    4   |      8  4.0|
                                            __________________________________________________________________________|____________|
   Oral Mucosa                             |          +                                                               |   1        |
      Pharyngeal, Necrosis                 |          3                                                               |      1  3.0|
                                            __________________________________________________________________________|____________|
   Pancreas                                | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Acinus, Atrophy                      |    1  1  1     3              1  2  1  1        1        2  1  1     1  1|     27  1.4|
                                            __________________________________________________________________________|____________|
   Salivary Glands                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
                                            __________________________________________________________________________|____________|
   Stomach, Forestomach                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Inflammation, Chronic Active         |                                                                          |      4  1.8|
      Epithelium, Hyperplasia              |             2                                                           2|      8  2.3|
      Epithelium, Ulcer                    |                                                                          |      3  2.7|
                                            __________________________________________________________________________|____________|
   Stomach, Glandular                      | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Epithelium, Erosion                  |                                                                          |      1  2.0|
 _____________________________________________________________________________________________________________________|            |
 CARDIOVASCULAR SYSTEM                     |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Blood Vessel                            | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
                                            __________________________________________________________________________|____________|
   Heart                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  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  46                                                               
NTP Experiment-Test: 89002-02                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09
Study Type: CHRONIC                                         PENTACHLOROPHENOL                                     Date: 08/19/97  
Route: DOSED FEED                                                                                                 Time: 11:06:29  
                                                                                                                                    
 __________________________________________________________________________________________________________________________________ 
                                           | 5| 7| 5| 6| 7| 6| 7| 5| 7| 7| 5| 4| 7| 7| 7| 7| 6| 7| 7| 7| 6| 7| 7| 6| 6|            |
                             DAY ON TEST   | 3| 3| 0| 4| 2| 6| 3| 9| 3| 3| 4| 3| 3| 3| 3| 3| 6| 3| 3| 0| 1| 3| 3| 9| 9|            |
                                           | 4| 7| 7| 7| 3| 3| 7| 2| 7| 7| 4| 5| 7| 7| 7| 7| 3| 7| 7| 2| 9| 7| 7| 8| 8|      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| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1|      A     |
    200 PPM                                | 8| 8| 8| 8| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 1|      L     |
                                           | 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|            |
 __________________________________________________________________________________________________________________________________ 
 CARDIOVASCULAR SYSTEM - cont              |                                                                          |            |
                                           |                                                                          |            |
      Cardiomyopathy, Chronic              | 1  2  2  2     2  2  2     2  2  2  2  2  2  2     2  2  2     2  2  2   |     41  1.9|
      Atrium, Thrombosis                   |       4        3                                                         |      7  3.1|
 _____________________________________________________________________________________________________________________|            |
 ENDOCRINE SYSTEM                          |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Adrenal Cortex                          | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Degeneration, Cystic                 |                                                                          |      1  2.0|
      Degeneration, Fatty                  | 1     1     2                       1  2  1           3  1  2  3         |     19  1.8|
      Hyperplasia                          |    2        1                       2  2  1  2                 3         |     11  1.9|
      Hypertrophy                          |                                                                          |      1  3.0|
                                            __________________________________________________________________________|____________|
   Adrenal Medulla                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Degeneration, Fatty                  |                                                                          |      1  2.0|
      Hyperplasia                          |    1     4  2           2  2        4  2  1           2  1  1        2  3|     27  1.9|
                                            __________________________________________________________________________|____________|
   Islets, Pancreatic                      | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
                                            __________________________________________________________________________|____________|
   Parathyroid Gland                       | +  M  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  M  +  +|  45        |
      Hyperplasia                          |             2                       1                                    |      3  2.0|
                                            __________________________________________________________________________|____________|
   Pituitary Gland                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Pars Distalis, Cyst                  |    1              1     2                          2     3        2      |      8  2.0|
      Pars Distalis, Hyperplasia           | 2  2     1        2           2           1                              |     13  1.8|
      Pars Intermedia, Cyst                |                                                                          |      1  1.0|
                                            __________________________________________________________________________|____________|
   Thyroid Gland                           | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Ultimobranchial Cyst                 |       2                                                                  |      1  2.0|
      C-Cell, Hyperplasia                  |       1     1                                                     1  1   |      8  1.1|
      Follicle, Cyst                       |                                     2                                    |      1  2.0|
 _____________________________________________________________________________________________________________________|            |
 GENERAL BODY SYSTEM                       |                                                                          |            |
                                           |                                                                          |            |
    None                                   |                                                                          |            |
 _____________________________________________________________________________________________________________________|            |
 GENITAL SYSTEM                            |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Coagulating Gland                       |                                                       +                  |   1        |
      Inflammation, Chronic Active         |                                                       4                  |      1  4.0|
                                            __________________________________________________________________________|____________|
   Epididymis                              | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Granuloma Sperm                      |       4                                                                  |      2  3.0|
                                            __________________________________________________________________________|____________|
   Preputial Gland                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Hyperplasia                          |          4              4        4                       2               |      7  3.3|
      Inflammation, Chronic Active         | 1  2  2  3  2  2  1  1  3  2     1  2  2  2  2  2  2     2  2  2  2  2   |     40  1.9|
                                            __________________________________________________________________________|____________|
   Prostate                                | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Inflammation, Chronic Active         | 2     1  1  2     2  2  1  1     1  3        1     1  4     2  3  1  1  1|     34  1.7|
      Epithelium, Hyperplasia              |             2                                                            |      1  2.0|
                                            __________________________________________________________________________|____________|
   Seminal Vesicle                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  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: 89002-02                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09
Study Type: CHRONIC                                         PENTACHLOROPHENOL                                     Date: 08/19/97  
Route: DOSED FEED                                                                                                 Time: 11:06:29  
                                                                                                                                    
 __________________________________________________________________________________________________________________________________ 
                                           | 5| 7| 5| 6| 7| 6| 7| 5| 7| 7| 5| 4| 7| 7| 7| 7| 6| 7| 7| 7| 6| 7| 7| 6| 6|            |
                             DAY ON TEST   | 3| 3| 0| 4| 2| 6| 3| 9| 3| 3| 4| 3| 3| 3| 3| 3| 6| 3| 3| 0| 1| 3| 3| 9| 9|            |
                                           | 4| 7| 7| 7| 3| 3| 7| 2| 7| 7| 4| 5| 7| 7| 7| 7| 3| 7| 7| 2| 9| 7| 7| 8| 8|      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| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1|      A     |
    200 PPM                                | 8| 8| 8| 8| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 1|      L     |
                                           | 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                     |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Testes                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Germinal Epithelium, Atrophy         |       4                                                                  |      2  4.0|
      Interstitial Cell, Hyperplasia       | 1     1        1     1           1                                       |     10  1.0|
 _____________________________________________________________________________________________________________________|            |
 HEMATOPOIETIC SYSTEM                      |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Bone Marrow                             | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Atrophy, Focal                       |                                                                          |      1  4.0|
      Atrophy                              |                         4                                                |      1  4.0|
      Hyperplasia                          | 4     4  3                 3  4  3  3  4        4  3  4  4     3  3  4  4|     33  3.7|
      Myelofibrosis                        |                                                                      2   |      2  2.0|
                                            __________________________________________________________________________|____________|
   Lymph Node                              | +     +     +  +  +     +  +  +     +  +  +  +  +     +  +  +        +  +|  34        |
      Lumbar, Hyperplasia, Lymphoid        |                                                                          |      1  2.0|
      Mediastinal, Hyperplasia, Lymphoid   |                                                       3                  |      1  3.0|
      Mediastinal, Pigmentation,           |                                                                          |            |
          Hemosiderin                      |       1     1  1  1     1  1  1     1  1  1  1              1            |     19  1.1|
                                            __________________________________________________________________________|____________|
   Lymph Node, Mandibular                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
                                            __________________________________________________________________________|____________|
   Lymph Node, Mesenteric                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Erythrophagocytosis                  |                                                                          |      1  3.0|
                                            __________________________________________________________________________|____________|
   Spleen                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Fibrosis                             |                         3                                         2      |      3  2.7|
                                            __________________________________________________________________________|____________|
   Thymus                                  | +  +  +  +  M  +  +  +  +  +  +  +  +  +  M  +  M  +  +  +  +  +  +  +  +|  46        |
      Ectopic Parathyroid Gland            |                                                                          |      1  2.0|
 _____________________________________________________________________________________________________________________|            |
 INTEGUMENTARY SYSTEM                      |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Mammary Gland                           | +  +  +  +  +  +  +  +  +  +  +  M  +  +  +  +  +  +  +  +  +  +  +  +  +|  47        |
      Hyperplasia, Cystic                  | 1        1  4  1  2  3  2  1        2        1  2     3  2  2  2  2  2  2|     34  2.0|
                                            __________________________________________________________________________|____________|
   Skin                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Cyst Epithelial Inclusion            |                                                    X                     |      1     |
      Inflammation, Granulomatous          |                                                    2                     |      1  2.0|
      Epidermis, Hyperkeratosis            |                                                                          |      1  4.0|
 _____________________________________________________________________________________________________________________|            |
 MUSCULOSKELETAL SYSTEM                    |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Bone                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Osteopetrosis                        |                                                                          |      1  2.0|
                                            __________________________________________________________________________|____________|
   Skeletal Muscle                         |                                                                          |   1        |
 _____________________________________________________________________________________________________________________|            |
 NERVOUS SYSTEM                            |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Brain                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Necrosis                             |                         2                                                |      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  48                                                               
NTP Experiment-Test: 89002-02                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09
Study Type: CHRONIC                                         PENTACHLOROPHENOL                                     Date: 08/19/97  
Route: DOSED FEED                                                                                                 Time: 11:06:29  
                                                                                                                                    
 __________________________________________________________________________________________________________________________________ 
                                           | 5| 7| 5| 6| 7| 6| 7| 5| 7| 7| 5| 4| 7| 7| 7| 7| 6| 7| 7| 7| 6| 7| 7| 6| 6|            |
                             DAY ON TEST   | 3| 3| 0| 4| 2| 6| 3| 9| 3| 3| 4| 3| 3| 3| 3| 3| 6| 3| 3| 0| 1| 3| 3| 9| 9|            |
                                           | 4| 7| 7| 7| 3| 3| 7| 2| 7| 7| 4| 5| 7| 7| 7| 7| 3| 7| 7| 2| 9| 7| 7| 8| 8|      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| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1|      A     |
    200 PPM                                | 8| 8| 8| 8| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 1|      L     |
                                           | 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                     |                                                                          |            |
                                           |                                                                          |            |
 _____________________________________________________________________________________________________________________|            |
 RESPIRATORY SYSTEM                        |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Lung                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Alveolar Epithelium, Hyperplasia     |                   4              1           2        2              3   |      5  2.4|
      Alveolus, Infiltration Cellular,     |                                                                          |            |
           Histiocyte                      |    1  1  1  1  1  1  1     1  1  1  1  1  1  1  2        3     1     1  1|     37  1.1|
                                            __________________________________________________________________________|____________|
   Nose                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Fungus                               | X     X                             X           X                        |     15     |
      Inflammation, Chronic Active         | 2     2           1     1           2  1     1  2                        |     19  2.2|
      Nasolacrimal Duct, Inflammation,     |                                                                          |            |
           Suppurative                     |    1        3                                                            |      6  2.0|
      Respiratory Epithelium, Hyperplasia  | 2     2           2                 4        2  3                        |     16  2.6|
      Respiratory Epithelium, Metaplasia,  |                                                                          |            |
           Squamous                        |       3                             3           2                        |      9  2.6|
                                            __________________________________________________________________________|____________|
   Trachea                                 | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
 _____________________________________________________________________________________________________________________|            |
 SPECIAL SENSES SYSTEM                     |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Eye                                     |                      +                       +                           |   4        |
      Lens, Cataract                       |                      4                       3                           |      3  3.3|
      Retina, Atrophy                      |                      4                       4                           |      4  3.5|
      Retina, Hemorrhage                   |                                                                          |      1  2.0|
      Sclera, Metaplasia, Osseous          |                                                                          |      1  2.0|
 _____________________________________________________________________________________________________________________|            |
 URINARY SYSTEM                            |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Kidney                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Accumulation, Hyaline Droplet        |       3                                                                  |      1  3.0|
      Cyst                                 |       3     2  3                       3                                 |      4  2.8|
      Nephropathy, Chronic                 | 1  2  3  2  4  4  3  2  2  3  2  2  2  3  2  3  2  3  2  1  2  3  2  2  2|     49  2.1|
      Renal Tubule, Pigmentation           | 1  1  2  1  2  1  1  2  2  1  1  1  2  1  1  1  2  1  1  2  1  1  1  4  3|     48  1.4|
                                            __________________________________________________________________________|____________|
   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  49                                                               
NTP Experiment-Test: 89002-02                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09
Study Type: CHRONIC                                         PENTACHLOROPHENOL                                     Date: 08/19/97  
Route: DOSED FEED                                                                                                 Time: 11:06:29  
                                                                                                                                    
 _____________________________________________________________________________________________________________________              
                                           | 7| 4| 7| 7| 6| 6| 7| 7| 6| 6| 6| 7| 7| 6| 7| 6| 6| 7| 6| 5| 7| 7| 5| 7| 6|             
                             DAY ON TEST   | 1| 4| 3| 3| 8| 9| 3| 3| 6| 1| 7| 3| 3| 0| 3| 4| 4| 3| 4| 7| 3| 3| 8| 0| 2|             
                                           | 1| 3| 7| 7| 8| 8| 7| 7| 6| 9| 6| 7| 7| 5| 7| 8| 0| 7| 0| 2| 7| 7| 3| 2| 4|             
 _____________________________________________________________________________________________________________________|             
                                           | 0| 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|             
    400 PPM                                | 1| 1| 1| 1| 1| 1| 1| 1| 1| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 3| 3| 3| 3| 3| 3|             
                                           | 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                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Parasite Metazoan                    |                                                                          |             
                                            __________________________________________________________________________|             
   Intestine Large, Rectum                 | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Parasite Metazoan                    |                                                             X     X      |             
                                            __________________________________________________________________________|             
   Intestine Large, Cecum                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Hyperplasia, Lymphoid                |                                                                1         |             
                                            __________________________________________________________________________|             
   Intestine Small, Duodenum               | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Intestine Small, Jejunum                | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Intestine Small, Ileum                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Parasite Metazoan                    |                                                    X                     |             
                                            __________________________________________________________________________|             
   Liver                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Angiectasis                          |                                                                1         |             
      Basophilic Focus                     |       X  X     X     X           X  X     X                 X            |             
      Clear Cell Focus                     |          X                       X  X     X                 X            |             
      Eosinophilic Focus                   |          X                                                               |             
      Hepatodiaphragmatic Nodule           |                                                                X         |             
      Inflammation, Chronic                |       1  1           1        1  1  1     1  2              1     2      |             
      Mixed Cell Focus                     |                                                                          |             
      Bile Duct, Hyperplasia               |    1  1  2  3  2  3  2  2  2  1  2  2  1  2  2  2  3  3  3  2  2  2  3  2|             
      Hepatocyte, Degeneration, Cystic     | 1     1  1        3  1  1     2  1     2        1  1  1     2     1  3   |             
      Hepatocyte, Necrosis                 |                                                                          |             
      Hepatocyte, Vacuolization Cytoplasmic|          1                    2           1                              |             
      Hepatocyte, Centrilobular,           |                                                                          |             
          Degeneration                     |                                                                          |             
      Hepatocyte, Centrilobular, Necrosis  |                                                 3                        |             
      Portal Vein, Thrombosis              |             4                                                            |             
                                            __________________________________________________________________________|             
   Mesentery                               |          +  +  +     +              +           +     +  +  +        +  +|             
      Accessory Spleen                     |                                     X                                    |             
      Fat, Necrosis                        |          4  4  4                                      4              4   |             
                                            __________________________________________________________________________|             
   Oral Mucosa                             |                                           +                              |             
      Gingival, Inflammation, Suppurative  |                                           2                              |             
                                            __________________________________________________________________________|             
   Pancreas                                | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Acinus, Atrophy                      |                1  1  1  4        1  2     2                 1            |             
                                            __________________________________________________________________________|             
   Salivary Glands                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Stomach, Forestomach                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Inflammation, Chronic Active         |                               2                                          |             
      Epithelium, Hyperplasia, Basal Cell  |                      2                                                   |             
      Epithelium, Hyperplasia              |                               3                                          |             
      Epithelium, Ulcer                    |                               4                                          |             
                                            __________________________________________________________________________|             
   Stomach, Glandular                      | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Inflammation, Chronic Active         |                                                                          |             
      Epithelium, Ulcer                    |                                                                          |             
                                            __________________________________________________________________________|             
   Tongue                                  |                                                       +                  |             
 _____________________________________________________________________________________________________________________|             

                                                             Page  50                                                               
NTP Experiment-Test: 89002-02                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09
Study Type: CHRONIC                                         PENTACHLOROPHENOL                                     Date: 08/19/97  
Route: DOSED FEED                                                                                                 Time: 11:06:29  
                                                                                                                                    
 _____________________________________________________________________________________________________________________              
                                           | 7| 4| 7| 7| 6| 6| 7| 7| 6| 6| 6| 7| 7| 6| 7| 6| 6| 7| 6| 5| 7| 7| 5| 7| 6|             
                             DAY ON TEST   | 1| 4| 3| 3| 8| 9| 3| 3| 6| 1| 7| 3| 3| 0| 3| 4| 4| 3| 4| 7| 3| 3| 8| 0| 2|             
                                           | 1| 3| 7| 7| 8| 8| 7| 7| 6| 9| 6| 7| 7| 5| 7| 8| 0| 7| 0| 2| 7| 7| 3| 2| 4|             
 _____________________________________________________________________________________________________________________|             
                                           | 0| 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|             
    400 PPM                                | 1| 1| 1| 1| 1| 1| 1| 1| 1| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 3| 3| 3| 3| 3| 3|             
                                           | 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                  |                                                                          |             
                                           |                                                                          |             
      Inflammation, Chronic Active         |                                                       3                  |             
 _____________________________________________________________________________________________________________________|             
 CARDIOVASCULAR SYSTEM                     |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Blood Vessel                            | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Heart                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Cardiomyopathy, Chronic              | 2  2  2  1  2  2  3  2  2  2  2  2  2  2  2  2  2  3  2     2  3     2   |             
      Inflammation, Suppurative            |                                                                          |             
      Atrium, Thrombosis                   |                                                 1                    2   |             
 _____________________________________________________________________________________________________________________|             
 ENDOCRINE SYSTEM                          |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Adrenal Cortex                          | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Accessory Adrenal Cortical Nodule    |                                                                1         |             
      Degeneration, Cystic                 |                                                                         1|             
      Degeneration, Fatty                  |    2     1  3  1     2              1  1     2        1        1        3|             
      Hyperplasia                          |          1  2                    1  1  1     2                 2     2   |             
      Hypertrophy                          |    2                                                                     |             
                                            __________________________________________________________________________|             
   Adrenal Medulla                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Hyperplasia                          | 2           2  2              2  1     1     1     2  1     1  2  2  3  1|             
                                            __________________________________________________________________________|             
   Islets, Pancreatic                      | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Parathyroid Gland                       | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Pituitary Gland                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Pars Distalis, Cyst                  |                                           1                       2      |             
      Pars Distalis, Hemorrhage            |                                                                          |             
      Pars Distalis, Hyperplasia           |          1  2     2                 2                    2     1  2      |             
      Pars Intermedia, Cyst                |             3                                            2               |             
                                            __________________________________________________________________________|             
   Thyroid Gland                           | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      C-Cell, Hyperplasia                  |             1     2     1                 1  2     1           2  1      |             
      Follicle, Cyst                       |                                                                          |             
 _____________________________________________________________________________________________________________________|             
 GENERAL BODY SYSTEM                       |                                                                          |             
                                           |                                                                          |             
    None                                   |                                                                          |             
 _____________________________________________________________________________________________________________________|             
 GENITAL SYSTEM                            |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Epididymis                              | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Preputial Gland                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Hyperplasia                          |                   4  4  2     1  2                       2               |             
      Inflammation, Chronic Active         | 2  2  2  2  2  2     2  3  1  2  2  1  2  1  1  2  2  2  4  2  2  2  2  2|             
      Duct, Cyst                           |                         3                                                |             
                                            __________________________________________________________________________|             
   Prostate                                | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Inflammation, Chronic Active         | 1  2  2  1  1  2              1        4     3  1     2           1  1   |             
                                            __________________________________________________________________________|             
   Seminal Vesicle                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Testes                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Germinal Epithelium, Atrophy         | 4                                                  4                 4   |             
      Interstitial Cell, Hyperplasia       |                                              1        1                  |             
 _____________________________________________________________________________________________________________________|             

                                                             Page  51                                                               
NTP Experiment-Test: 89002-02                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09
Study Type: CHRONIC                                         PENTACHLOROPHENOL                                     Date: 08/19/97  
Route: DOSED FEED                                                                                                 Time: 11:06:29  
                                                                                                                                    
 _____________________________________________________________________________________________________________________              
                                           | 7| 4| 7| 7| 6| 6| 7| 7| 6| 6| 6| 7| 7| 6| 7| 6| 6| 7| 6| 5| 7| 7| 5| 7| 6|             
                             DAY ON TEST   | 1| 4| 3| 3| 8| 9| 3| 3| 6| 1| 7| 3| 3| 0| 3| 4| 4| 3| 4| 7| 3| 3| 8| 0| 2|             
                                           | 1| 3| 7| 7| 8| 8| 7| 7| 6| 9| 6| 7| 7| 5| 7| 8| 0| 7| 0| 2| 7| 7| 3| 2| 4|             
 _____________________________________________________________________________________________________________________|             
                                           | 0| 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|             
    400 PPM                                | 1| 1| 1| 1| 1| 1| 1| 1| 1| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 3| 3| 3| 3| 3| 3|             
                                           | 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                     |                                                                          |             
                                           |                                                                          |             
 _____________________________________________________________________________________________________________________|             
 HEMATOPOIETIC SYSTEM                      |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Bone Marrow                             | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Atrophy                              |             3                                                            |             
      Hyperplasia                          | 4     3        4  4  3  4  4     3     4           4  4  4  3  3  3  4  4|             
                                            __________________________________________________________________________|             
   Lymph Node                              | +     +  +  +  +  +  +  +  +  +        +  +  +     +  +  +  +  +     +  +|             
      Mediastinal, Hyperplasia, Lymphoid   |                      2                                      2            |             
      Mediastinal, Necrosis                |                                                          3               |             
      Mediastinal, Pigmentation,           |                                                                          |             
          Hemosiderin                      |       2  2  1  1  2     1     1           1  1     1  2     1  1     2   |             
                                            __________________________________________________________________________|             
   Lymph Node, Mandibular                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Ectasia                              |                         2                                                |             
      Hyperplasia, Lymphoid                |                                                    3                     |             
      Hyperplasia, Plasma Cell             |                4                                                         |             
                                            __________________________________________________________________________|             
   Lymph Node, Mesenteric                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Ectasia                              |                         3                                                |             
      Pigmentation, Hemosiderin            |                                                             2            |             
                                            __________________________________________________________________________|             
   Spleen                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Fibrosis                             |                                                    2                     |             
      Hematopoietic Cell Proliferation     |                                                                          |             
      Necrosis                             | 3                                                                        |             
                                            __________________________________________________________________________|             
   Thymus                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  M  +  +  +  +  +  +  +|             
 _____________________________________________________________________________________________________________________|             
 INTEGUMENTARY SYSTEM                      |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Mammary Gland                           | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Cyst                                 |                                                                          |             
      Hyperplasia, Cystic                  |    2  1     2  2  1           2        2     2     2  2              2   |             
                                            __________________________________________________________________________|             
   Skin                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Inflammation, Chronic Active         |                                                                          |             
      Epidermis, Hyperkeratosis            |                                  4                          4            |             
 _____________________________________________________________________________________________________________________|             
 MUSCULOSKELETAL SYSTEM                    |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Bone                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
 _____________________________________________________________________________________________________________________|             
 NERVOUS SYSTEM                            |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Brain                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Hemorrhage                           |                                                                         3|             
      Inflammation, Suppurative            |                                                                          |             
                                            __________________________________________________________________________|             
   Peripheral Nerve                        |                                                          +               |             
                                            __________________________________________________________________________|             
   Spinal Cord                             |                      +                                   +               |             
 _____________________________________________________________________________________________________________________|             
 RESPIRATORY SYSTEM                        |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Lung                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Inflammation, Chronic Active         |                               1           1                 1            |             
 _____________________________________________________________________________________________________________________|             

                                                             Page  52                                                               
NTP Experiment-Test: 89002-02                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09
Study Type: CHRONIC                                         PENTACHLOROPHENOL                                     Date: 08/19/97  
Route: DOSED FEED                                                                                                 Time: 11:06:29  
                                                                                                                                    
 _____________________________________________________________________________________________________________________              
                                           | 7| 4| 7| 7| 6| 6| 7| 7| 6| 6| 6| 7| 7| 6| 7| 6| 6| 7| 6| 5| 7| 7| 5| 7| 6|             
                             DAY ON TEST   | 1| 4| 3| 3| 8| 9| 3| 3| 6| 1| 7| 3| 3| 0| 3| 4| 4| 3| 4| 7| 3| 3| 8| 0| 2|             
                                           | 1| 3| 7| 7| 8| 8| 7| 7| 6| 9| 6| 7| 7| 5| 7| 8| 0| 7| 0| 2| 7| 7| 3| 2| 4|             
 _____________________________________________________________________________________________________________________|             
                                           | 0| 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|             
    400 PPM                                | 1| 1| 1| 1| 1| 1| 1| 1| 1| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 3| 3| 3| 3| 3| 3|             
                                           | 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                 |                                                                          |             
                                           |                                                                          |             
      Alveolar Epithelium, Hyperplasia     |                                     2                          3         |             
      Alveolus, Infiltration Cellular,     |                                                                          |             
           Histiocyte                      |    1  1  1     1     1  1     1  1  1  1  1  1  1  1        1  1  1  1  1|             
                                            __________________________________________________________________________|             
   Nose                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Fungus                               |                X        X                          X           X         |             
      Hemorrhage                           |                                                                   4      |             
      Inflammation, Chronic Active         |       1        3     1  3        1  2              3        1  2  2      |             
      Nasolacrimal Duct, Inflammation,     |                                                                          |             
           Suppurative                     |                2  1                                                      |             
      Respiratory Epithelium, Hyperplasia  |       2        3     1  2        1  3              3           3         |             
      Respiratory Epithelium, Metaplasia,  |                                                                          |             
           Squamous                        |                         3           2              3                     |             
                                            __________________________________________________________________________|             
   Trachea                                 | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
 _____________________________________________________________________________________________________________________|             
 SPECIAL SENSES SYSTEM                     |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Eye                                     |                                                                          |             
      Cornea, Inflammation, Chronic Active |                                                                          |             
                                            __________________________________________________________________________|             
   Zymbal's Gland                          |                +                                                         |             
 _____________________________________________________________________________________________________________________|             
 URINARY SYSTEM                            |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Kidney                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Cyst                                 |                                                                          |             
      Infarct                              |                                                                          |             
      Inflammation, Suppurative            |                                                                          |             
      Nephropathy, Chronic                 | 2  2  2  2  2  3  3  3  2  1  3  2  2  2  3  2  3  2  2  2  2  2  2  2  2|             
      Renal Tubule, Pigmentation           | 1  1  1  2  2  1  2  1  2  2  1  1  1  1  1  1  2  1  2  2  1  1  1  3  1|             
                                            __________________________________________________________________________|             
   Urinary Bladder                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
 _____________________________________________________________________________________________________________________|             

                                                             Page  53                                                               
NTP Experiment-Test: 89002-02                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09
Study Type: CHRONIC                                         PENTACHLOROPHENOL                                     Date: 08/19/97  
Route: DOSED FEED                                                                                                 Time: 11:06:29  
                                                                                                                                    
 __________________________________________________________________________________________________________________________________ 
                                           | 5| 7| 5| 7| 7| 7| 7| 7| 6| 7| 5| 7| 6| 7| 5| 5| 7| 5| 7| 7| 7| 5| 4| 6| 3|            |
                             DAY ON TEST   | 9| 3| 6| 3| 3| 3| 3| 2| 4| 3| 2| 3| 2| 3| 5| 9| 3| 2| 3| 2| 3| 6| 8| 1| 6|            |
                                           | 3| 7| 1| 7| 7| 7| 7| 2| 5| 7| 7| 7| 0| 7| 7| 3| 7| 1| 7| 9| 7| 3| 2| 7| 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     |
    400 PPM                                | 3| 3| 3| 3| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 5| 5| 5| 5| 5| 5| 5| 5| 5| 5| 6|      L     |
                                           | 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                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Parasite Metazoan                    |                   X                                                      |      1     |
                                            __________________________________________________________________________|____________|
   Intestine Large, Rectum                 | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Parasite Metazoan                    |                      X                                                   |      3     |
                                            __________________________________________________________________________|____________|
   Intestine Large, Cecum                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Hyperplasia, Lymphoid                |                                                                          |      1  1.0|
                                            __________________________________________________________________________|____________|
   Intestine Small, Duodenum               | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
                                            __________________________________________________________________________|____________|
   Intestine Small, Jejunum                | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
                                            __________________________________________________________________________|____________|
   Intestine Small, Ileum                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Parasite Metazoan                    |                                                                          |      1     |
                                            __________________________________________________________________________|____________|
   Liver                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Angiectasis                          |                                                                          |      1  1.0|
      Basophilic Focus                     |    X     X     X  X        X     X           X  X  X  X     X           X|     20     |
      Clear Cell Focus                     |                X           X                                             |      7     |
      Eosinophilic Focus                   |                                                                          |      1     |
      Hepatodiaphragmatic Nodule           |    X  X           X                 X              X                     |      6     |
      Inflammation, Chronic                | 1  1     2     1  1  1           2           2     1        2  1        1|     22  1.3|
      Mixed Cell Focus                     |                         X                                                |      1     |
      Bile Duct, Hyperplasia               | 2  2  2     3  2  2  2  3  2  2  2  3  3  2  2  2  2  2  2  2  2  2      |     46  2.1|
      Hepatocyte, Degeneration, Cystic     |          1  2     2     1     2  2  1  2  1  1  2     1  2               |     28  1.5|
      Hepatocyte, Necrosis                 |                                                    1        1            |      2  1.0|
      Hepatocyte, Vacuolization Cytoplasmic|          1     1                                                         |      5  1.2|
      Hepatocyte, Centrilobular,           |                                                                          |            |
          Degeneration                     |                                              2                           |      1  2.0|
      Hepatocyte, Centrilobular, Necrosis  |                                                                          |      1  3.0|
      Portal Vein, Thrombosis              |                                                                          |      1  4.0|
                                            __________________________________________________________________________|____________|
   Mesentery                               |             +                                +  +              +         |  15        |
      Accessory Spleen                     |                                                                          |      1     |
      Fat, Necrosis                        |             4                                   4              4         |      8  4.0|
                                            __________________________________________________________________________|____________|
   Oral Mucosa                             |                                                                          |   1        |
      Gingival, Inflammation, Suppurative  |                                                                          |      1  2.0|
                                            __________________________________________________________________________|____________|
   Pancreas                                | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Acinus, Atrophy                      |    1        2  2  1                             1     1  1  1            |     16  1.4|
                                            __________________________________________________________________________|____________|
   Salivary Glands                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
                                            __________________________________________________________________________|____________|
   Stomach, Forestomach                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Inflammation, Chronic Active         |                                                                      3  1|      3  2.0|
      Epithelium, Hyperplasia, Basal Cell  |    1                                                                     |      2  1.5|
      Epithelium, Hyperplasia              |                               3                                      2  2|      4  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  54                                                               
NTP Experiment-Test: 89002-02                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09
Study Type: CHRONIC                                         PENTACHLOROPHENOL                                     Date: 08/19/97  
Route: DOSED FEED                                                                                                 Time: 11:06:29  
                                                                                                                                    
 __________________________________________________________________________________________________________________________________ 
                                           | 5| 7| 5| 7| 7| 7| 7| 7| 6| 7| 5| 7| 6| 7| 5| 5| 7| 5| 7| 7| 7| 5| 4| 6| 3|            |
                             DAY ON TEST   | 9| 3| 6| 3| 3| 3| 3| 2| 4| 3| 2| 3| 2| 3| 5| 9| 3| 2| 3| 2| 3| 6| 8| 1| 6|            |
                                           | 3| 7| 1| 7| 7| 7| 7| 2| 5| 7| 7| 7| 0| 7| 7| 3| 7| 1| 7| 9| 7| 3| 2| 7| 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     |
    400 PPM                                | 3| 3| 3| 3| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 5| 5| 5| 5| 5| 5| 5| 5| 5| 5| 6|      L     |
                                           | 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                  |                                                                          |            |
                                           |                                                                          |            |
      Epithelium, Ulcer                    |       4                       4                                      2   |      4  3.5|
                                            __________________________________________________________________________|____________|
   Stomach, Glandular                      | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Inflammation, Chronic Active         |                         2                                                |      1  2.0|
      Epithelium, Ulcer                    |                         4                                                |      1  4.0|
                                            __________________________________________________________________________|____________|
   Tongue                                  |                                                                          |   1        |
      Inflammation, Chronic Active         |                                                                          |      1  3.0|
 _____________________________________________________________________________________________________________________|            |
 CARDIOVASCULAR SYSTEM                     |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Blood Vessel                            | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
                                            __________________________________________________________________________|____________|
   Heart                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Cardiomyopathy, Chronic              | 2  2     2  3  3  2  1     2     2  2  2     2  2  2  2     2  2  2     1|     41  2.0|
      Inflammation, Suppurative            |                                           3                              |      1  3.0|
      Atrium, Thrombosis                   |                2                       3                                 |      4  2.0|
 _____________________________________________________________________________________________________________________|            |
 ENDOCRINE SYSTEM                          |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Adrenal Cortex                          | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Accessory Adrenal Cortical Nodule    |                                                                          |      1  1.0|
      Degeneration, Cystic                 |                                                                          |      1  1.0|
      Degeneration, Fatty                  |       1           2           4  1                       3               |     16  1.8|
      Hyperplasia                          |    1              2  1           1                          2            |     13  1.5|
      Hypertrophy                          |       2                                                                  |      2  2.0|
                                            __________________________________________________________________________|____________|
   Adrenal Medulla                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Hyperplasia                          |          2  4  4                    3        1  3  2  2                  |     22  2.0|
                                            __________________________________________________________________________|____________|
   Islets, Pancreatic                      | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
                                            __________________________________________________________________________|____________|
   Parathyroid Gland                       | +  +  +  +  +  +  +  +  M  +  +  +  +  +  +  +  M  +  +  +  +  +  M  +  +|  47        |
                                            __________________________________________________________________________|____________|
   Pituitary Gland                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  I  +  +  +  +  +  +  +  +  +  +|  49        |
      Pars Distalis, Cyst                  |                         1                                                |      3  1.3|
      Pars Distalis, Hemorrhage            |                                                                   4      |      1  4.0|
      Pars Distalis, Hyperplasia           |       1     2     1        2  1        1           2                    1|     15  1.5|
      Pars Intermedia, Cyst                |                                                                      2   |      3  2.3|
                                            __________________________________________________________________________|____________|
   Thyroid Gland                           | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      C-Cell, Hyperplasia                  | 1     1  1  2  1  2  1              1  2        1  1     1  1            |     21  1.3|
      Follicle, Cyst                       |                                                          2               |      1  2.0|
 _____________________________________________________________________________________________________________________|            |
 GENERAL BODY SYSTEM                       |                                                                          |            |
                                           |                                                                          |            |
    None                                   |                                                                          |            |
 _____________________________________________________________________________________________________________________|            |
 GENITAL SYSTEM                            |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Epididymis                              | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  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  55                                                               
NTP Experiment-Test: 89002-02                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09
Study Type: CHRONIC                                         PENTACHLOROPHENOL                                     Date: 08/19/97  
Route: DOSED FEED                                                                                                 Time: 11:06:29  
                                                                                                                                    
 __________________________________________________________________________________________________________________________________ 
                                           | 5| 7| 5| 7| 7| 7| 7| 7| 6| 7| 5| 7| 6| 7| 5| 5| 7| 5| 7| 7| 7| 5| 4| 6| 3|            |
                             DAY ON TEST   | 9| 3| 6| 3| 3| 3| 3| 2| 4| 3| 2| 3| 2| 3| 5| 9| 3| 2| 3| 2| 3| 6| 8| 1| 6|            |
                                           | 3| 7| 1| 7| 7| 7| 7| 2| 5| 7| 7| 7| 0| 7| 7| 3| 7| 1| 7| 9| 7| 3| 2| 7| 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     |
    400 PPM                                | 3| 3| 3| 3| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 5| 5| 5| 5| 5| 5| 5| 5| 5| 5| 6|      L     |
                                           | 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        |
      Hyperplasia                          |                                                       2                  |      7  2.4|
      Inflammation, Chronic Active         | 1  1  2  2  2  2  2  2  2  2  2  2  1  2     2  2  1  2  2  2  2  1  3   |     47  1.9|
      Duct, Cyst                           |                                                       3                  |      2  3.0|
                                            __________________________________________________________________________|____________|
   Prostate                                | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Inflammation, Chronic Active         |    2  1     1  1     3     2  1  2  1     1     3  2  1  2  1  1  1  1  1|     32  1.6|
                                            __________________________________________________________________________|____________|
   Seminal Vesicle                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
                                            __________________________________________________________________________|____________|
   Testes                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Germinal Epithelium, Atrophy         |    4                                                                     |      4  4.0|
      Interstitial Cell, Hyperplasia       |                      1                                         1  1     1|      6  1.0|
 _____________________________________________________________________________________________________________________|            |
 HEMATOPOIETIC SYSTEM                      |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Bone Marrow                             | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Atrophy                              |                                                                          |      1  3.0|
      Hyperplasia                          |       4  3  3     3     4  3  4  3  4  4  4  4  3  4  3  4  3        4  4|     36  3.6|
                                            __________________________________________________________________________|____________|
   Lymph Node                              | +  +  +     +  +     +  +  +  +     +  +  +  +           +           +   |  35        |
      Mediastinal, Hyperplasia, Lymphoid   |                1                                                         |      3  1.7|
      Mediastinal, Necrosis                |                                                                          |      1  3.0|
      Mediastinal, Pigmentation,           |                                                                          |            |
          Hemosiderin                      | 1  2           1     1     1        1  1     2           1               |     23  1.3|
                                            __________________________________________________________________________|____________|
   Lymph Node, Mandibular                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Ectasia                              |                                                       2                  |      2  2.0|
      Hyperplasia, Lymphoid                |                                                                          |      1  3.0|
      Hyperplasia, Plasma Cell             |                                                                          |      1  4.0|
                                            __________________________________________________________________________|____________|
   Lymph Node, Mesenteric                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Ectasia                              |                                                                          |      1  3.0|
      Pigmentation, Hemosiderin            |                                                                          |      1  2.0|
                                            __________________________________________________________________________|____________|
   Spleen                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Fibrosis                             |                         2                       3                        |      3  2.3|
      Hematopoietic Cell Proliferation     |                                              3                           |      1  3.0|
      Necrosis                             |                                                                      2   |      2  2.5|
                                            __________________________________________________________________________|____________|
   Thymus                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  49        |
 _____________________________________________________________________________________________________________________|            |
 INTEGUMENTARY SYSTEM                      |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Mammary Gland                           | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Cyst                                 |                      3                                                   |      1  3.0|
      Hyperplasia, Cystic                  | 1  2     1  1  1  1  2     1                    3  1  1  1           1   |     24  1.5|
                                            __________________________________________________________________________|____________|
   Skin                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Inflammation, Chronic Active         |                                  2                                       |      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  56                                                               
NTP Experiment-Test: 89002-02                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09
Study Type: CHRONIC                                         PENTACHLOROPHENOL                                     Date: 08/19/97  
Route: DOSED FEED                                                                                                 Time: 11:06:29  
                                                                                                                                    
 __________________________________________________________________________________________________________________________________ 
                                           | 5| 7| 5| 7| 7| 7| 7| 7| 6| 7| 5| 7| 6| 7| 5| 5| 7| 5| 7| 7| 7| 5| 4| 6| 3|            |
                             DAY ON TEST   | 9| 3| 6| 3| 3| 3| 3| 2| 4| 3| 2| 3| 2| 3| 5| 9| 3| 2| 3| 2| 3| 6| 8| 1| 6|            |
                                           | 3| 7| 1| 7| 7| 7| 7| 2| 5| 7| 7| 7| 0| 7| 7| 3| 7| 1| 7| 9| 7| 3| 2| 7| 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     |
    400 PPM                                | 3| 3| 3| 3| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 5| 5| 5| 5| 5| 5| 5| 5| 5| 5| 6|      L     |
                                           | 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               |                                                                          |            |
                                           |                                                                          |            |
      Epidermis, Hyperkeratosis            |                                  4                                       |      3  4.0|
 _____________________________________________________________________________________________________________________|            |
 MUSCULOSKELETAL SYSTEM                    |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Bone                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
 _____________________________________________________________________________________________________________________|            |
 NERVOUS SYSTEM                            |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Brain                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Hemorrhage                           |       3                       3           2              3           3   |      6  2.8|
      Inflammation, Suppurative            |                                           2                              |      1  2.0|
                                            __________________________________________________________________________|____________|
   Peripheral Nerve                        |                                                                          |   1        |
                                            __________________________________________________________________________|____________|
   Spinal Cord                             |                                                                          |   2        |
 _____________________________________________________________________________________________________________________|            |
 RESPIRATORY SYSTEM                        |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Lung                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Inflammation, Chronic Active         |                1           1                                             |      5  1.0|
      Alveolar Epithelium, Hyperplasia     |                                              2                           |      3  2.3|
      Alveolus, Infiltration Cellular,     |                                                                          |            |
           Histiocyte                      | 1  1  1     1     1  1  1  1  1  1  3  1  1     1  1  1  1  1  1     1   |     39  1.1|
                                            __________________________________________________________________________|____________|
   Nose                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Fungus                               |                X           X        X     X           X        X         |     10     |
      Hemorrhage                           |                                                                          |      1  4.0|
      Inflammation, Chronic Active         |    2     2     3  1        2        3     2        1  3  2     3     1   |     22  2.0|
      Nasolacrimal Duct, Inflammation,     |                                                                          |            |
           Suppurative                     |       2        1              2                                   2      |      6  1.7|
      Respiratory Epithelium, Hyperplasia  |          3     3           3  1     3                 3  2     3     2   |     17  2.4|
      Respiratory Epithelium, Metaplasia,  |                                                                          |            |
           Squamous                        |    2                       2  2     2                          2         |      8  2.3|
                                            __________________________________________________________________________|____________|
   Trachea                                 | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
 _____________________________________________________________________________________________________________________|            |
 SPECIAL SENSES SYSTEM                     |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Eye                                     |                +                                                         |   1        |
      Cornea, Inflammation, Chronic Active |                2                                                         |      1  2.0|
                                            __________________________________________________________________________|____________|
   Zymbal's Gland                          |                                                                          |   1        |
 _____________________________________________________________________________________________________________________|            |
 URINARY SYSTEM                            |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Kidney                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|  50        |
      Cyst                                 |                2                                                         |      1  2.0|
      Infarct                              |                         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  57                                                               
NTP Experiment-Test: 89002-02                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09
Study Type: CHRONIC                                         PENTACHLOROPHENOL                                     Date: 08/19/97  
Route: DOSED FEED                                                                                                 Time: 11:06:29  
                                                                                                                                    
 __________________________________________________________________________________________________________________________________ 
                                           | 5| 7| 5| 7| 7| 7| 7| 7| 6| 7| 5| 7| 6| 7| 5| 5| 7| 5| 7| 7| 7| 5| 4| 6| 3|            |
                             DAY ON TEST   | 9| 3| 6| 3| 3| 3| 3| 2| 4| 3| 2| 3| 2| 3| 5| 9| 3| 2| 3| 2| 3| 6| 8| 1| 6|            |
                                           | 3| 7| 1| 7| 7| 7| 7| 2| 5| 7| 7| 7| 0| 7| 7| 3| 7| 1| 7| 9| 7| 3| 2| 7| 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     |
    400 PPM                                | 3| 3| 3| 3| 4| 4| 4| 4| 4| 4| 4| 4| 4| 4| 5| 5| 5| 5| 5| 5| 5| 5| 5| 5| 6|      L     |
                                           | 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                     |                                                                          |            |
                                           |                                                                          |            |
      Nephropathy, Chronic                 | 1  2  2  2  2  3  3  2  2  2  2  3  2  3  2  2  2  1  3  2  1  2  2  2  2|     50  2.1|
      Renal Tubule, Pigmentation           | 1  1  2  2  1  1  1  1  2  1  1  1  1  2  1  3  1  1  1  1  2  2  1  1   |     49  1.4|
                                            __________________________________________________________________________|____________|
   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  58                                                               
NTP Experiment-Test: 89002-02                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09
Study Type: CHRONIC                                         PENTACHLOROPHENOL                                     Date: 08/19/97  
Route: DOSED FEED                                                                                                 Time: 11:06:29  
                                                                                                                                    
 _____________________________________________________________________________________________________________________              
                                           | 7| 7| 7| 7| 7| 7| 5| 6| 7| 6| 7| 7| 7| 7| 7| 6| 7| 7| 5| 7| 7| 7| 7| 7| 5|             
                             DAY ON TEST   | 0| 3| 3| 3| 0| 0| 4| 1| 3| 6| 3| 1| 3| 3| 3| 2| 3| 3| 6| 3| 3| 3| 3| 3| 1|             
                                           | 8| 7| 6| 7| 8| 2| 4| 0| 7| 0| 6| 2| 7| 7| 7| 0| 7| 7| 1| 6| 6| 7| 6| 7| 8|             
 _____________________________________________________________________________________________________________________|             
                                           | 0| 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|             
    600 PPM                                | 6| 6| 6| 6| 6| 6| 6| 6| 6| 7| 7| 7| 7| 7| 7| 7| 7| 7| 7| 8| 8| 8| 8| 8| 8|             
                                           | 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                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Parasite Metazoan                    |             X                                                            |             
                                            __________________________________________________________________________|             
   Intestine Large, Rectum                 | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Parasite Metazoan                    |                                                 X                        |             
                                            __________________________________________________________________________|             
   Intestine Large, Cecum                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Inflammation, Chronic Active         |                                                                          |             
                                            __________________________________________________________________________|             
   Intestine Small, Duodenum               | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Intestine Small, Jejunum                | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Intestine Small, Ileum                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Peyer's Patch, Inflammation, Chronic |                                                                          |             
          Active                           |                                                                          |             
                                            __________________________________________________________________________|             
   Liver                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Angiectasis                          |                                                                          |             
      Basophilic Focus                     |       X           X           X  X        X              X           X   |             
      Clear Cell Focus                     |                                                                X  X  X   |             
      Eosinophilic Focus                   | X     X                       X                    X           X         |             
      Hepatodiaphragmatic Nodule           |                   X     X           X              X                     |             
      Inflammation, Chronic                |       1           1  2        1        2  2  1  1  1           1  2  1   |             
      Mixed Cell Focus                     |                                                                          |             
      Bile Duct, Hyperplasia               | 2  3  2  3  2  3     2  3  3  2  2  3  2  2  2  1  2  2  2  2  2  2  2  2|             
      Hepatocyte, Degeneration, Cystic     | 3  2     2  2  1     1  2  1  1  1  1  2     1     1  2  1     2  1  3   |             
      Hepatocyte, Necrosis                 |                                                                          |             
      Hepatocyte, Vacuolization Cytoplasmic|                               1                 2  1              1      |             
      Hepatocyte, Centrilobular,           |                                                                          |             
          Degeneration                     |                                                                          |             
      Hepatocyte, Centrilobular, Necrosis  | 4                                                                        |             
                                            __________________________________________________________________________|             
   Mesentery                               |                      +  +        +           +        +                  |             
      Inflammation, Chronic Active         |                                                                          |             
      Fat, Necrosis                        |                      4  4                    4                           |             
                                            __________________________________________________________________________|             
   Pancreas                                | +  +  +  +  +  +  +  +  +  +  +  M  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Acinus, Atrophy                      |    2  1  2  1        2     1  2     1  1  2  1  1  2           2         |             
                                            __________________________________________________________________________|             
   Salivary Glands                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Stomach, Forestomach                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Inflammation, Chronic Active         | 1                                                     2                  |             
      Epithelium, Hyperplasia              | 1                                                     2                  |             
      Epithelium, Ulcer                    |                                                       2                  |             
                                            __________________________________________________________________________|             
   Stomach, Glandular                      | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Mineralization                       |                                                                          |             
      Epithelium, Erosion                  |                                                                         2|             
      Epithelium, Ulcer                    |                                                                          |             
                                            __________________________________________________________________________|             
   Tongue                                  |                                                                          |             
 _____________________________________________________________________________________________________________________|             
 CARDIOVASCULAR SYSTEM                     |                                                                          |             
                                           |                                                                          |             
 _____________________________________________________________________________________________________________________|             

                                                             Page  59                                                               
NTP Experiment-Test: 89002-02                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09
Study Type: CHRONIC                                         PENTACHLOROPHENOL                                     Date: 08/19/97  
Route: DOSED FEED                                                                                                 Time: 11:06:29  
                                                                                                                                    
 _____________________________________________________________________________________________________________________              
                                           | 7| 7| 7| 7| 7| 7| 5| 6| 7| 6| 7| 7| 7| 7| 7| 6| 7| 7| 5| 7| 7| 7| 7| 7| 5|             
                             DAY ON TEST   | 0| 3| 3| 3| 0| 0| 4| 1| 3| 6| 3| 1| 3| 3| 3| 2| 3| 3| 6| 3| 3| 3| 3| 3| 1|             
                                           | 8| 7| 6| 7| 8| 2| 4| 0| 7| 0| 6| 2| 7| 7| 7| 0| 7| 7| 1| 6| 6| 7| 6| 7| 8|             
 _____________________________________________________________________________________________________________________|             
                                           | 0| 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|             
    600 PPM                                | 6| 6| 6| 6| 6| 6| 6| 6| 6| 7| 7| 7| 7| 7| 7| 7| 7| 7| 7| 8| 8| 8| 8| 8| 8|             
                                           | 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|             
 _____________________________________________________________________________________________________________________|             
 CARDIOVASCULAR SYSTEM - cont              |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Blood Vessel                            | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Aorta, Mineralization                |                                                                          |             
                                            __________________________________________________________________________|             
   Heart                                   | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Cardiomyopathy, Chronic              | 2  2  2  2  2  2  2     3     2  2  3  2  1  2     2  2  2  2  2  2  2  2|             
      Mineralization                       |                                                                          |             
      Atrium, Thrombosis                   | 4                                                                        |             
 _____________________________________________________________________________________________________________________|             
 ENDOCRINE SYSTEM                          |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Adrenal Cortex                          | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Accessory Adrenal Cortical Nodule    |                                                                          |             
      Degeneration, Fatty                  |          1  2                          1  1        1  2  2              2|             
      Hyperplasia                          |                                        2  2        2     2     1  1      |             
      Hypertrophy                          |          2                             2                 2               |             
                                            __________________________________________________________________________|             
   Adrenal Medulla                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Hyperplasia                          |       1  2  1     1        2        1  3  2              2  1  1  1      |             
                                            __________________________________________________________________________|             
   Islets, Pancreatic                      | +  +  +  +  +  +  +  +  +  +  +  M  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Hyperplasia                          |                                                                          |             
                                            __________________________________________________________________________|             
   Parathyroid Gland                       | +  +  M  +  +  +  +  +  +  M  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Pituitary Gland                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Pars Distalis, Cyst                  |             3                                                            |             
      Pars Distalis, Hyperplasia           |             2     1  1  3  2  2     2              2              1  1   |             
      Pars Intermedia, Cyst                |                                                                          |             
                                            __________________________________________________________________________|             
   Thyroid Gland                           | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Ectopic Tissue                       |    2                                                                     |             
      C-Cell, Hyperplasia                  |       1        1        1  2                    1  2     2     2  1  2   |             
 _____________________________________________________________________________________________________________________|             
 GENERAL BODY SYSTEM                       |                                                                          |             
                                           |                                                                          |             
    None                                   |                                                                          |             
 _____________________________________________________________________________________________________________________|             
 GENITAL SYSTEM                            |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Epididymis                              | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Preputial Gland                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Hyperplasia                          |       2                    2  2                                          |             
      Inflammation, Chronic Active         | 2  2  2  2  2  2  2  2  2  2  2  2  2  2  2  1  2  2     1  2  2  2  2  2|             
                                            __________________________________________________________________________|             
   Prostate                                | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Inflammation, Chronic Active         |    1     1  1     3  1  1  1           3     3     2              1     1|             
                                            __________________________________________________________________________|             
   Seminal Vesicle                         | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Testes                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Germinal Epithelium, Atrophy         |                                        2                                 |             
      Interstitial Cell, Hyperplasia       |                                        1     1                          2|             
 _____________________________________________________________________________________________________________________|             
 HEMATOPOIETIC SYSTEM                      |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Bone Marrow                             | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Hyperplasia                          |    4  3  3  4  4  4     4  4     4  3     3        3  4     4        3  4|             
 _____________________________________________________________________________________________________________________|             

                                                             Page  60                                                               
NTP Experiment-Test: 89002-02                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09
Study Type: CHRONIC                                         PENTACHLOROPHENOL                                     Date: 08/19/97  
Route: DOSED FEED                                                                                                 Time: 11:06:29  
                                                                                                                                    
 _____________________________________________________________________________________________________________________              
                                           | 7| 7| 7| 7| 7| 7| 5| 6| 7| 6| 7| 7| 7| 7| 7| 6| 7| 7| 5| 7| 7| 7| 7| 7| 5|             
                             DAY ON TEST   | 0| 3| 3| 3| 0| 0| 4| 1| 3| 6| 3| 1| 3| 3| 3| 2| 3| 3| 6| 3| 3| 3| 3| 3| 1|             
                                           | 8| 7| 6| 7| 8| 2| 4| 0| 7| 0| 6| 2| 7| 7| 7| 0| 7| 7| 1| 6| 6| 7| 6| 7| 8|             
 _____________________________________________________________________________________________________________________|             
                                           | 0| 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|             
    600 PPM                                | 6| 6| 6| 6| 6| 6| 6| 6| 6| 7| 7| 7| 7| 7| 7| 7| 7| 7| 7| 8| 8| 8| 8| 8| 8|             
                                           | 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               |                                                                          |             
                                           |                                                                          |             
      Myelofibrosis                        |             2                                                            |             
                                            __________________________________________________________________________|             
   Lymph Node                              | +  +  +  +  +  +     +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |             
      Mediastinal, Pigmentation,           |                                                                          |             
          Hemosiderin                      | 2  1  2  1  1        1        1  2  1  1  1  1  1  1     1  2  1  2      |             
      Pancreatic, Ectasia                  |                                                                          |             
                                            __________________________________________________________________________|             
   Lymph Node, Mandibular                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Ectasia                              |                                           3                              |             
                                            __________________________________________________________________________|             
   Lymph Node, Mesenteric                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Ectasia                              |                               3                                          |             
                                            __________________________________________________________________________|             
   Spleen                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Fibrosis                             |                                                          2               |             
      Necrosis                             |    4                                                                     |             
                                            __________________________________________________________________________|             
   Thymus                                  | +  +  +  +  +  +  +  +  +  +  M  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
 _____________________________________________________________________________________________________________________|             
 INTEGUMENTARY SYSTEM                      |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Mammary Gland                           | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Cyst                                 |                                                                          |             
      Hyperplasia, Cystic                  |          1  3           2  1           2     2  2     2  2  2     1  2   |             
                                            __________________________________________________________________________|             
   Skin                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Cyst Epithelial Inclus
NTP is located at the National Institute of Environmental Health Sciences, part of the National Institutes of Health.