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TDMS Study 88034-07 Pathology Tables

NTP Experiment-Test: 88034-07                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09
Study Type: CHRONIC                                             OZONE/NNK                                         Date: 04/23/97
Route: RESPIRATORY EXPOSURE WHOLE BODY                                                                            Time: 08:17:56




       Facility:  Battelle Northwest

       Chemical CAS #:  10028-15-6

       Lock Date:  02/17/93

       Cage Range:  All

       Reasons For Removal:    All

       Removal Date Range:     All

       Treatment Groups:       Include All






































                                                              Page   1

NTP Experiment-Test: 88034-07                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09
Study Type: CHRONIC                                             OZONE/NNK                                         Date: 04/23/97  
Route: RESPIRATORY EXPOSURE WHOLE BODY                                                                            Time: 08:17:56  
                                                                                                                                    
 _____________________________________________________________________________________________________________________              
                                           | 5| 7| 7| 7| 6| 5| 5| 6| 5| 6| 7| 6| 7| 5| 6| 6| 7| 6| 5| 6| 7| 6| 5| 4| 5|             
                             DAY ON TEST   | 4| 0| 0| 3| 3| 4| 8| 1| 6| 9| 3| 3| 3| 6| 0| 2| 3| 6| 5| 9| 0| 5| 5| 8| 6|             
                                           | 3| 0| 0| 6| 8| 0| 9| 1| 2| 8| 6| 3| 6| 4| 4| 0| 6| 9| 6| 7| 4| 5| 6| 4| 9|             
 _____________________________________________________________________________________________________________________|             
                                           | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|             
   FISCHER 344 RATS MALE                   | 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8|             
                               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|             
    TRIOCT./                               | 0| 0| 0| 0| 0| 0| 0| 0| 0| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 2| 2| 2| 2| 2| 2|             
    AIR                                    | 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                         |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Intestine Large, Colon                  |    +                                                                     |             
      Mineralization                       |    3                                                                     |             
                                            __________________________________________________________________________|             
   Intestine Large, Rectum                 |                                        +                                 |             
                                            __________________________________________________________________________|             
   Liver                                   |    +  +     +     +        +  +     +           +  +     +  +  +     +  +|             
      Degeneration, Cystic                 |                                                             2  2         |             
      Hepatodiaphragmatic Nodule           |                                     X              X                     |             
      Hyperplasia, Focal                   |             4                                                            |             
      Infiltration Cellular, Mixed Cell    |    1                                                                     |             
      Necrosis                             |       3                                                                  |             
      Vacuolization Cytoplasmic, Focal     |                                                 2                        |             
      Vacuolization Cytoplasmic            |                                                                          |             
      Bile Duct, Hyperplasia               |                                                          3               |             
                                            __________________________________________________________________________|             
   Mesentery                               |             +                 +  +     +                                 |             
      Fat, Necrosis                        |             3                 3        3                                 |             
                                            __________________________________________________________________________|             
   Pancreas                                |                                                       +                  |             
                                            __________________________________________________________________________|             
   Stomach, Forestomach                    |    +                                                                     |             
      Mineralization                       |    3                                                                     |             
                                            __________________________________________________________________________|             
   Stomach, Glandular                      |    +                                                                     |             
      Mineralization                       |    3                                                                     |             
                                            __________________________________________________________________________|             
   Tongue                                  |                            +                                             |             
 _____________________________________________________________________________________________________________________|             
 CARDIOVASCULAR SYSTEM                     |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Blood Vessel                            |    +                                                                     |             
      Aorta, Mineralization                |    3                                                                     |             
                                            __________________________________________________________________________|             
   Heart                                   |    +                                                                     |             
      Mineralization                       |    4                                                                     |             
 _____________________________________________________________________________________________________________________|             
 ENDOCRINE SYSTEM                          |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Adrenal Cortex                          |                +                                                  +      |             
                                            __________________________________________________________________________|             
   Adrenal Medulla                         |                +                                               +         |             
      Hemorrhage                           |                                                                4         |             
                                            __________________________________________________________________________|             
   Islets, Pancreatic                      |                                                                      +   |             
                                            __________________________________________________________________________|             
   Parathyroid Gland                       |    +                                                                     |             
      Hyperplasia                          |    3                                                                     |             
                                            __________________________________________________________________________|             
   Pituitary Gland                         | +  +  +           +  +  +        +  +  +  +  +  +  +  +     +  +     +  +|             
      Pars Distalis, Hyperplasia           |                                                                          |             
                                            __________________________________________________________________________|             
   Thyroid Gland                           |                                                    +     +               |             
 _____________________________________________________________________________________________________________________|             
 GENERAL BODY SYSTEM                       |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Peritoneum                              |    +  +  +  +     +  +     +  +  +           +  +  +  +  +     +     +  +|             
      Inflammation, Chronic                |    1  1  1  1     1  1     1  1  1           1  1  1  1  1     1     1  1|             
                                            __________________________________________________________________________|             
   Tissue NOS                              |                                                                          |             
 _____________________________________________________________________________________________________________________|             
 GENITAL SYSTEM                            |                                                                          |             
                                           |                                                                          |             
 _____________________________________________________________________________________________________________________|             
                                                             Page   2                                                               
NTP Experiment-Test: 88034-07                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09
Study Type: CHRONIC                                             OZONE/NNK                                         Date: 04/23/97  
Route: RESPIRATORY EXPOSURE WHOLE BODY                                                                            Time: 08:17:56  
                                                                                                                                    
 _____________________________________________________________________________________________________________________              
                                           | 5| 7| 7| 7| 6| 5| 5| 6| 5| 6| 7| 6| 7| 5| 6| 6| 7| 6| 5| 6| 7| 6| 5| 4| 5|             
                             DAY ON TEST   | 4| 0| 0| 3| 3| 4| 8| 1| 6| 9| 3| 3| 3| 6| 0| 2| 3| 6| 5| 9| 0| 5| 5| 8| 6|             
                                           | 3| 0| 0| 6| 8| 0| 9| 1| 2| 8| 6| 3| 6| 4| 4| 0| 6| 9| 6| 7| 4| 5| 6| 4| 9|             
 _____________________________________________________________________________________________________________________|             
                                           | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|             
   FISCHER 344 RATS MALE                   | 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8|             
                               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|             
    TRIOCT./                               | 0| 0| 0| 0| 0| 0| 0| 0| 0| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 2| 2| 2| 2| 2| 2|             
    AIR                                    | 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                     |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Epididymis                              |                                                             +            |             
      Granuloma Sperm                      |                                                             3            |             
                                            __________________________________________________________________________|             
   Preputial Gland                         | +                                +                             +         |             
      Inflammation, Chronic Active         |                                  2                             3         |             
      Inflammation, Suppurative            | 4                                                                        |             
                                            __________________________________________________________________________|             
   Testes                                  | +           +  +           +        +           +  +     +  +            |             
      Atrophy                              | 4              3                                                         |             
      Interstitial Cell, Hyperplasia       |                                                    2                     |             
 _____________________________________________________________________________________________________________________|             
 HEMATOPOIETIC SYSTEM                      |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Lymph Node                              |       +           +           +  +                                       |             
      Infiltration Cellular, Plasma Cell   |                                                                          |             
      Iliac, Infiltration Cellular, Plasma |                                                                          |             
          Cell                             |       2                                                                  |             
      Pancreatic, Inflammation,            |                                                                          |             
          Granulomatous                    |                               2                                          |             
      Renal, Hemorrhage                    |                                                                          |             
      Renal, Infiltration Cellular, Plasma |                                                                          |             
          Cell                             |       3           2                                                      |             
      Renal, Inflammation, Granulomatous   |                                                                          |             
                                            __________________________________________________________________________|             
   Lymph Node, Bronchial                   | +  +  +  +  +  M  M  +  M  M  +  +  +  +  +  +  +  +  +  M  +  +  +  +  M|             
      Hemorrhage                           |       2                                                                  |             
      Hyperplasia, Lymphoid                |                                                                3         |             
                                            __________________________________________________________________________|             
   Lymph Node, Mandibular                  | +           +              +                                             |             
                                            __________________________________________________________________________|             
   Lymph Node, Mesenteric                  |                                        +              +                  |             
                                            __________________________________________________________________________|             
   Lymph Node, Mediastinal                 | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  M  +  +  M|             
      Hemorrhage                           |             4                                                            |             
      Infiltration Cellular, Plasma Cell   |       2                                                                  |             
      Inflammation, Chronic Active         |                                                    3                     |             
                                            __________________________________________________________________________|             
   Spleen                                  | +  +  +  +  +     +        +  +     +  +     +  +     +     +  +  +  +  +|             
      Accessory Spleen                     |                                        X                                 |             
      Congestion                           |                                                 1                        |             
      Fibrosis                             |    2  2                       2        3                       2        2|             
      Hematopoietic Cell Proliferation     |                                                                3         |             
 _____________________________________________________________________________________________________________________|             
 INTEGUMENTARY SYSTEM                      |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Mammary Gland                           |                                  +              +                        |             
      Galactocele                          |                                  3                                       |             
      Hyperplasia                          |                                                 3                        |             
                                            __________________________________________________________________________|             
   Skin                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Inflammation, Chronic                |                                                                         3|             
      Subcutaneous Tissue, Inflammation,   |                                                                          |             
           Chronic                         |                                                                          |             
      Subcutaneous Tissue, Skin, Site of   |                                                                          |             
 _____________________________________________________________________________________________________________________|             
                                                             Page   3                                                               
NTP Experiment-Test: 88034-07                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09
Study Type: CHRONIC                                             OZONE/NNK                                         Date: 04/23/97  
Route: RESPIRATORY EXPOSURE WHOLE BODY                                                                            Time: 08:17:56  
                                                                                                                                    
 _____________________________________________________________________________________________________________________              
                                           | 5| 7| 7| 7| 6| 5| 5| 6| 5| 6| 7| 6| 7| 5| 6| 6| 7| 6| 5| 6| 7| 6| 5| 4| 5|             
                             DAY ON TEST   | 4| 0| 0| 3| 3| 4| 8| 1| 6| 9| 3| 3| 3| 6| 0| 2| 3| 6| 5| 9| 0| 5| 5| 8| 6|             
                                           | 3| 0| 0| 6| 8| 0| 9| 1| 2| 8| 6| 3| 6| 4| 4| 0| 6| 9| 6| 7| 4| 5| 6| 4| 9|             
 _____________________________________________________________________________________________________________________|             
                                           | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|             
   FISCHER 344 RATS MALE                   | 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8|             
                               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|             
    TRIOCT./                               | 0| 0| 0| 0| 0| 0| 0| 0| 0| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 2| 2| 2| 2| 2| 2|             
    AIR                                    | 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               |                                                                          |             
                                           |                                                                          |             
          Application, Inflammation,       |                                                                          |             
          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  1|             
 _____________________________________________________________________________________________________________________|             
 MUSCULOSKELETAL SYSTEM                    |                                                                          |             
                                           |                                                                          |             
    None                                   |                                                                          |             
 _____________________________________________________________________________________________________________________|             
 NERVOUS SYSTEM                            |                                                                          |             
                                           |                                                                          |             
    None                                   |                                                                          |             
 _____________________________________________________________________________________________________________________|             
 RESPIRATORY SYSTEM                        |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Larynx                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Foreign Body                         |                                                                         X|             
      Inflammation, Suppurative            | 1                                                                        |             
      Metaplasia, Squamous                 |                                                          1               |             
                                            __________________________________________________________________________|             
   Lung                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Congestion                           |                                                                          |             
      Fibrosis, Focal                      |                                                    2           3         |             
      Hemorrhage                           |                                                    2  1           1      |             
      Mineralization                       |    4                                                           1         |             
      Alveolus, Infiltration Cellular,     |                                                                          |             
           Histiocyte                      |                                                    3                     |             
      Interstitium, Inflammation, Chronic, |                                                                          |             
           Diffuse                         |                                                    3           2         |             
      Perivascular, Inflammation, Chronic  |                                                 2                        |             
                                            __________________________________________________________________________|             
   Nose                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Inflammation, Suppurative            |                            3                                             |             
      Goblet Cell, Lateral Wall,           |                                                                          |             
          Hyperplasia                      |                            1  1                 1                        |             
      Lateral Wall, Hyperplasia            |    2                       1  1     1                                    |             
      Olfactory Epithelium, Degeneration,  |                                                                          |             
           Hyaline                         | 1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  2  2  1  1  1  1  1  1|             
      Olfactory Epithelium, Metaplasia     |                                                                          |             
                                            __________________________________________________________________________|             
   Trachea                                 | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
 _____________________________________________________________________________________________________________________|             
 SPECIAL SENSES SYSTEM                     |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Eye                                     |                                        +                                 |             
      Cataract                             |                                        4                                 |             
      Hemorrhage                           |                                        4                                 |             
      Ciliary Body, Retina, Degeneration   |                                        4                                 |             
 _____________________________________________________________________________________________________________________|             
 URINARY SYSTEM                            |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Kidney                                  |    +  +     +              +  +     +        +  +  +        +  +     +  +|             
      Cyst                                 |                                                                          |             
      Hydronephrosis                       |                                                                          |             
      Nephropathy                          |    4  3     2              4  3     3        3  3  4        4  4     3  3|             
 _____________________________________________________________________________________________________________________|             
                                                             Page   4                                                               
NTP Experiment-Test: 88034-07                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09
Study Type: CHRONIC                                             OZONE/NNK                                         Date: 04/23/97  
Route: RESPIRATORY EXPOSURE WHOLE BODY                                                                            Time: 08:17:56  
                                                                                                                                    
 __________________________________________________________________________________________________________________________________ 
                                           | 6| 4| 6| 7| 7| 6| 6| 7| 7| 7| 5| 6| 7| 5| 6| 3| 7| 7| 6| 5| 6| 6| 6|     |            |
                             DAY ON TEST   | 6| 6| 7| 0| 3| 8| 6| 3| 0| 1| 8| 4| 3| 1| 1| 2| 2| 3| 9| 7| 2| 7| 1|     |            |
                                           | 4| 6| 2| 6| 6| 1| 3| 6| 9| 7| 5| 1| 6| 5| 1| 7| 4| 6| 2| 6| 0| 3| 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|     |      O     |
   FISCHER 344 RATS MALE                   | 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8|     |      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|     |      A     |
    TRIOCT./                               | 2| 2| 2| 2| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 4| 4| 4| 4| 4| 4| 4| 4| 4|     |      L     |
    AIR                                    | 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8|     |            |
 __________________________________________________________________________________________________________________________________ 
 ALIMENTARY SYSTEM                         |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Intestine Large, Colon                  |                                                                          |   1        |
      Mineralization                       |                                                                          |      1  3.0|
                                            __________________________________________________________________________|____________|
   Intestine Large, Rectum                 |                                                                          |   1        |
                                            __________________________________________________________________________|____________|
   Liver                                   |       +     +  +     +  +  +  +           +  +  +              +  +      |  26        |
      Degeneration, Cystic                 |                      2     2                    2                        |      5  2.0|
      Hepatodiaphragmatic Nodule           |                         X     X                                          |      4     |
      Hyperplasia, Focal                   |                                                                          |      1  4.0|
      Infiltration Cellular, Mixed Cell    |                                                                          |      1  1.0|
      Necrosis                             |                                                                          |      1  3.0|
      Vacuolization Cytoplasmic, Focal     |                                                                          |      1  2.0|
      Vacuolization Cytoplasmic            |                                                                2         |      1  2.0|
      Bile Duct, Hyperplasia               |                                                                          |      1  3.0|
                                            __________________________________________________________________________|____________|
   Mesentery                               |             +  +        +                                   +            |   8        |
      Fat, Necrosis                        |             3  2        3                                   3            |      7  2.9|
                                            __________________________________________________________________________|____________|
   Pancreas                                |                                                                          |   1        |
                                            __________________________________________________________________________|____________|
   Stomach, Forestomach                    |                                                                          |   1        |
      Mineralization                       |                                                                          |      1  3.0|
                                            __________________________________________________________________________|____________|
   Stomach, Glandular                      |                                                                          |   1        |
      Mineralization                       |                                                                          |      1  3.0|
                                            __________________________________________________________________________|____________|
   Tongue                                  |                                                                          |   1        |
 _____________________________________________________________________________________________________________________|            |
 CARDIOVASCULAR SYSTEM                     |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Blood Vessel                            |                                                 +                        |   2        |
      Aorta, Mineralization                |                                                 3                        |      2  3.0|
                                            __________________________________________________________________________|____________|
   Heart                                   |                                                                          |   1        |
      Mineralization                       |                                                                          |      1  4.0|
 _____________________________________________________________________________________________________________________|            |
 ENDOCRINE SYSTEM                          |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Adrenal Cortex                          |    +                                                           +         |   4        |
                                            __________________________________________________________________________|____________|
   Adrenal Medulla                         |          +                                +                              |   4        |
      Hemorrhage                           |                                                                          |      1  4.0|
                                            __________________________________________________________________________|____________|
   Islets, Pancreatic                      |                                                                          |   1        |
                                            __________________________________________________________________________|____________|
   Parathyroid Gland                       |                         +                                                |   2        |
      Hyperplasia                          |                         4                                                |      2  3.5|
                                            __________________________________________________________________________|____________|
   Pituitary Gland                         | +        +  +        +  +  +  +  +  M  +  +        +  +  +  +  +  +      |  34        |
      Pars Distalis, Hyperplasia           |             2                                                            |      1  2.0|
                                            __________________________________________________________________________|____________|
   Thyroid Gland                           |                                                 +                        |   3        |
 _____________________________________________________________________________________________________________________|            |
 GENERAL BODY 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   5                                                               
NTP Experiment-Test: 88034-07                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09
Study Type: CHRONIC                                             OZONE/NNK                                         Date: 04/23/97  
Route: RESPIRATORY EXPOSURE WHOLE BODY                                                                            Time: 08:17:56  
                                                                                                                                    
 __________________________________________________________________________________________________________________________________ 
                                           | 6| 4| 6| 7| 7| 6| 6| 7| 7| 7| 5| 6| 7| 5| 6| 3| 7| 7| 6| 5| 6| 6| 6|     |            |
                             DAY ON TEST   | 6| 6| 7| 0| 3| 8| 6| 3| 0| 1| 8| 4| 3| 1| 1| 2| 2| 3| 9| 7| 2| 7| 1|     |            |
                                           | 4| 6| 2| 6| 6| 1| 3| 6| 9| 7| 5| 1| 6| 5| 1| 7| 4| 6| 2| 6| 0| 3| 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|     |      O     |
   FISCHER 344 RATS MALE                   | 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8|     |      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|     |      A     |
    TRIOCT./                               | 2| 2| 2| 2| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 4| 4| 4| 4| 4| 4| 4| 4| 4|     |      L     |
    AIR                                    | 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8|     |            |
 __________________________________________________________________________________________________________________________________ 
 GENERAL BODY SYSTEM - cont                |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Peritoneum                              | +  +  +  +     +        +        +     +  +  +  +  +     +     +  +      |  32        |
      Inflammation, Chronic                | 1        1     1        1        1     1  1  1  1  1     1     1  1      |     30  1.0|
                                            __________________________________________________________________________|____________|
   Tissue NOS                              |                   +                                                      |   1        |
 _____________________________________________________________________________________________________________________|            |
 GENITAL SYSTEM                            |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Epididymis                              |                                                                          |   1        |
      Granuloma Sperm                      |                                                                          |      1  3.0|
                                            __________________________________________________________________________|____________|
   Preputial Gland                         |             +     +           +              +           +               |   8        |
      Inflammation, Chronic Active         |                   2           3              3           2               |      6  2.5|
      Inflammation, Suppurative            |                                                                          |      1  4.0|
                                            __________________________________________________________________________|____________|
   Testes                                  |    +  +  +  +  +  +  +              +           +              +  +      |  20        |
      Atrophy                              |                3  3                             3                 3      |      6  3.2|
      Interstitial Cell, Hyperplasia       |                                                                   2      |      2  2.0|
 _____________________________________________________________________________________________________________________|            |
 HEMATOPOIETIC SYSTEM                      |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Lymph Node                              |             +                 +           +           +        +         |   9        |
      Infiltration Cellular, Plasma Cell   |                                                                3         |      1  3.0|
      Iliac, Infiltration Cellular, Plasma |                                                                          |            |
          Cell                             |                                                                          |      1  2.0|
      Pancreatic, Inflammation,            |                                                                          |            |
          Granulomatous                    |                                                                          |      1  2.0|
      Renal, Hemorrhage                    |                                                       2                  |      1  2.0|
      Renal, Infiltration Cellular, Plasma |                                                                          |            |
          Cell                             |             2                                                  3         |      4  2.5|
      Renal, Inflammation, Granulomatous   |                                                       2                  |      1  2.0|
                                            __________________________________________________________________________|____________|
   Lymph Node, Bronchial                   | +  +  +  +  +  +  +  +  M  +  +  +  +  +  M  +  +  M  +  M  +  +  +      |  38        |
      Hemorrhage                           |                                                                          |      1  2.0|
      Hyperplasia, Lymphoid                |                                                 2                        |      2  2.5|
                                            __________________________________________________________________________|____________|
   Lymph Node, Mandibular                  |                               +                                          |   4        |
                                            __________________________________________________________________________|____________|
   Lymph Node, Mesenteric                  |                                                                          |   2        |
                                            __________________________________________________________________________|____________|
   Lymph Node, Mediastinal                 | +  +  +  I  +  +  +  I  +  +  +  +  +  +  +  +  M  +  +  +  +  M  +      |  42        |
      Hemorrhage                           |                                                       2                  |      2  3.0|
      Infiltration Cellular, Plasma Cell   |                         2                                                |      2  2.0|
      Inflammation, Chronic Active         |                                                                          |      1  3.0|
                                            __________________________________________________________________________|____________|
   Spleen                                  | +     +  +  +  +     +  +  +  +     +  +  +  +     +  +        +  +      |  35        |
      Accessory Spleen                     |                                                                          |      1     |
      Congestion                           |                                                                2         |      2  1.5|
      Fibrosis                             |       2  2              2                             2        2  2      |     12  2.1|
      Hematopoietic Cell Proliferation     |                                                                          |      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   6                                                               
NTP Experiment-Test: 88034-07                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09
Study Type: CHRONIC                                             OZONE/NNK                                         Date: 04/23/97  
Route: RESPIRATORY EXPOSURE WHOLE BODY                                                                            Time: 08:17:56  
                                                                                                                                    
 __________________________________________________________________________________________________________________________________ 
                                           | 6| 4| 6| 7| 7| 6| 6| 7| 7| 7| 5| 6| 7| 5| 6| 3| 7| 7| 6| 5| 6| 6| 6|     |            |
                             DAY ON TEST   | 6| 6| 7| 0| 3| 8| 6| 3| 0| 1| 8| 4| 3| 1| 1| 2| 2| 3| 9| 7| 2| 7| 1|     |            |
                                           | 4| 6| 2| 6| 6| 1| 3| 6| 9| 7| 5| 1| 6| 5| 1| 7| 4| 6| 2| 6| 0| 3| 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|     |      O     |
   FISCHER 344 RATS MALE                   | 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8|     |      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|     |      A     |
    TRIOCT./                               | 2| 2| 2| 2| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 4| 4| 4| 4| 4| 4| 4| 4| 4|     |      L     |
    AIR                                    | 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8|     |            |
 __________________________________________________________________________________________________________________________________ 
 HEMATOPOIETIC SYSTEM - cont               |                                                                          |            |
                                           |                                                                          |            |
 _____________________________________________________________________________________________________________________|            |
 INTEGUMENTARY SYSTEM                      |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Mammary Gland                           |                                     +                 +                  |   4        |
      Galactocele                          |                                                       3                  |      2  3.0|
      Hyperplasia                          |                                                                          |      1  3.0|
                                            __________________________________________________________________________|____________|
   Skin                                    | +  +  +  +  +  +  +  +  +  +  +  +     +  +  +  +  +  +  +  +  +  +      |  47        |
      Inflammation, Chronic                |                                                                          |      1  3.0|
      Subcutaneous Tissue, Inflammation,   |                                                                          |            |
           Chronic                         |                                        1                                 |      1  1.0|
      Subcutaneous Tissue, Skin, Site of   |                                                                          |            |
          Application, Inflammation,       |                                                                          |            |
          Chronic                          | 1  1  1  1  1  1  1  1  1  1  1  1        1  1  1  1  1  1  1  1  1      |     46  1.0|
 _____________________________________________________________________________________________________________________|            |
 MUSCULOSKELETAL SYSTEM                    |                                                                          |            |
                                           |                                                                          |            |
    None                                   |                                                                          |            |
 _____________________________________________________________________________________________________________________|            |
 NERVOUS SYSTEM                            |                                                                          |            |
                                           |                                                                          |            |
    None                                   |                                                                          |            |
 _____________________________________________________________________________________________________________________|            |
 RESPIRATORY SYSTEM                        |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Larynx                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
      Foreign Body                         |                                              X  X                        |      3     |
      Inflammation, Suppurative            |                                                                          |      1  1.0|
      Metaplasia, Squamous                 |                                                                          |      1  1.0|
                                            __________________________________________________________________________|____________|
   Lung                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
      Congestion                           |                2                                               2         |      2  2.0|
      Fibrosis, Focal                      |                                                                          |      2  2.5|
      Hemorrhage                           |                                                                          |      3  1.3|
      Mineralization                       |                3                                1                        |      4  2.3|
      Alveolus, Infiltration Cellular,     |                                                                          |            |
           Histiocyte                      |                                                                          |      1  3.0|
      Interstitium, Inflammation, Chronic, |                                                                          |            |
           Diffuse                         |                                                 2                        |      3  2.3|
      Perivascular, Inflammation, Chronic  |                                                                          |      1  2.0|
                                            __________________________________________________________________________|____________|
   Nose                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  M  +      |  47        |
      Inflammation, Suppurative            |                                                                          |      1  3.0|
      Goblet Cell, Lateral Wall,           |                                                                          |            |
          Hyperplasia                      |                                                                          |      3  1.0|
      Lateral Wall, Hyperplasia            |                                                 1                        |      5  1.2|
 __________________________________________________________________________________________________________________________________ 
  * : 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   7                                                               
NTP Experiment-Test: 88034-07                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09
Study Type: CHRONIC                                             OZONE/NNK                                         Date: 04/23/97  
Route: RESPIRATORY EXPOSURE WHOLE BODY                                                                            Time: 08:17:56  
                                                                                                                                    
 __________________________________________________________________________________________________________________________________ 
                                           | 6| 4| 6| 7| 7| 6| 6| 7| 7| 7| 5| 6| 7| 5| 6| 3| 7| 7| 6| 5| 6| 6| 6|     |            |
                             DAY ON TEST   | 6| 6| 7| 0| 3| 8| 6| 3| 0| 1| 8| 4| 3| 1| 1| 2| 2| 3| 9| 7| 2| 7| 1|     |            |
                                           | 4| 6| 2| 6| 6| 1| 3| 6| 9| 7| 5| 1| 6| 5| 1| 7| 4| 6| 2| 6| 0| 3| 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|     |      O     |
   FISCHER 344 RATS MALE                   | 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8|     |      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|     |      A     |
    TRIOCT./                               | 2| 2| 2| 2| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 4| 4| 4| 4| 4| 4| 4| 4| 4|     |      L     |
    AIR                                    | 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8|     |            |
 __________________________________________________________________________________________________________________________________ 
 RESPIRATORY SYSTEM - cont                 |                                                                          |            |
                                           |                                                                          |            |
      Olfactory Epithelium, Degeneration,  |                                                                          |            |
           Hyaline                         | 1  1  1  1  1  1  1  1  1  1  1  1  2  1  2  1  1  2  1  2  2     1      |     47  1.1|
      Olfactory Epithelium, Metaplasia     |    2                                                                     |      1  2.0|
                                            __________________________________________________________________________|____________|
   Trachea                                 | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
 _____________________________________________________________________________________________________________________|            |
 SPECIAL SENSES SYSTEM                     |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Eye                                     | +                          +                                             |   3        |
      Cataract                             | 2                          4                                             |      3  3.3|
      Hemorrhage                           |                                                                          |      1  4.0|
      Ciliary Body, Retina, Degeneration   |                            4                                             |      2  4.0|
 _____________________________________________________________________________________________________________________|            |
 URINARY SYSTEM                            |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Kidney                                  |          +  +  +  +  +  +  +     +  +           +  +  +        +  +      |  27        |
      Cyst                                 |             3                                                            |      1  3.0|
      Hydronephrosis                       |                   3                                                      |      1  3.0|
      Nephropathy                          |          4  4  4  3  2  4  4     3  3           4  3  3        3  3      |     27  3.3|
 __________________________________________________________________________________________________________________________________ 
  * : Total animals with tissue examined microscopically; total animals with lesion and mean severity grade                         
  + : Tissue examined microscopically                M : Missing tissue                        1-4 : Lesion qualified as:           
  X : Lesion present but not qualified               A : Autolysis precludes examination               1) Minimal  3) Moderate      
  I : Insufficient tissue                        BLANK : Not examined                                  2) Mild     4) Marked        
                                                             Page   8                                                               
NTP Experiment-Test: 88034-07                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09
Study Type: CHRONIC                                             OZONE/NNK                                         Date: 04/23/97  
Route: RESPIRATORY EXPOSURE WHOLE BODY                                                                            Time: 08:17:56  
                                                                                                                                    
 _____________________________________________________________________________________________________________________              
                                           | 4| 4| 6| 7| 5| 4| 5| 7| 6| 6| 4| 7| 6| 6| 7| 5| 5| 5| 6| 6| 6| 6| 5| 5| 6|             
                             DAY ON TEST   | 1| 7| 1| 3| 8| 6| 4| 1| 8| 2| 6| 3| 6| 4| 0| 8| 0| 1| 3| 5| 2| 3| 8| 5| 8|             
                                           | 7| 8| 2| 6| 2| 6| 4| 0| 3| 0| 0| 6| 2| 1| 4| 9| 1| 8| 3| 5| 5| 5| 9| 7| 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                   | 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8|             
                               ANIMAL ID   | 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2|             
    .1MG/KG                                | 0| 0| 0| 0| 0| 0| 0| 0| 0| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 2| 2| 2| 2| 2| 2|             
    NNK/AIR                                | 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                         |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Intestine Large, Cecum                  |                                                    +                     |             
                                            __________________________________________________________________________|             
   Intestine Small, Ileum                  |                                                                          |             
                                            __________________________________________________________________________|             
   Liver                                   |       +     +     +     +  +     +     +     +  +     +  +     +  +     +|             
      Angiectasis                          |                                                                          |             
      Degeneration, Cystic                 |                                  2                                       |             
      Hepatodiaphragmatic Nodule           |                            X                                            X|             
      Hyperplasia, Focal                   |                            4                                             |             
      Vacuolization Cytoplasmic, Focal     |                                                                          |             
      Vacuolization Cytoplasmic            |                                                                3         |             
      Bile Duct, Hyperplasia               |                                        3                                 |             
      Centrilobular, Necrosis              |                                                                          |             
                                            __________________________________________________________________________|             
   Mesentery                               |       +                 +  +     +  +                 +                  |             
      Fat, Necrosis                        |       3                 3  3     3  3                 3                  |             
                                            __________________________________________________________________________|             
   Oral Mucosa                             |          +                                                     +         |             
      Pharyngeal, Hyperplasia, Squamous    |          3                                                               |             
                                            __________________________________________________________________________|             
   Stomach, Glandular                      |                                                                          |             
                                            __________________________________________________________________________|             
   Tongue                                  |                                                                          |             
 _____________________________________________________________________________________________________________________|             
 CARDIOVASCULAR SYSTEM                     |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Heart                                   |                                                                   +      |             
      Necrosis                             |                                                                   3      |             
 _____________________________________________________________________________________________________________________|             
 ENDOCRINE SYSTEM                          |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Adrenal Cortex                          |                                                                          |             
                                            __________________________________________________________________________|             
   Islets, Pancreatic                      |                      +                                               +   |             
                                            __________________________________________________________________________|             
   Pituitary Gland                         |    +     +  +     +  +  +  +     +        +  +     +  +  +  +  +  +  +  +|             
      Pars Distalis, Hyperplasia           |                                                                          |             
                                            __________________________________________________________________________|             
   Thyroid Gland                           |                               +  +                                       |             
 _____________________________________________________________________________________________________________________|             
 GENERAL BODY SYSTEM                       |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Peritoneum                              | +              +     +  +           +  +  +     +     +  +  +  +     +   |             
      Inflammation, Chronic                | 1              1     1  1           1  1  1     1     1  1  1  1     1   |             
 _____________________________________________________________________________________________________________________|             
 GENITAL SYSTEM                            |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Penis                                   |                                     +  +                                 |             
      Inflammation, Chronic Active         |                                        3                                 |             
                                            __________________________________________________________________________|             
   Preputial Gland                         |                +                       +  +                 +            |             
      Inflammation, Chronic Active         |                                        4  2                              |             
                                            __________________________________________________________________________|             
   Prostate                                |    +                                                                     |             
      Inflammation, Suppurative            |    3                                                                     |             
                                            __________________________________________________________________________|             
   Testes                                  |       +                 +        +     +                          +      |             
      Atrophy                              |                         3                                                |             
 _____________________________________________________________________________________________________________________|             
 HEMATOPOIETIC SYSTEM                      |                                                                          |             
                                           |                                                                          |             
 _____________________________________________________________________________________________________________________|             
                                                             Page   9                                                               
NTP Experiment-Test: 88034-07                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09
Study Type: CHRONIC                                             OZONE/NNK                                         Date: 04/23/97  
Route: RESPIRATORY EXPOSURE WHOLE BODY                                                                            Time: 08:17:56  
                                                                                                                                    
 _____________________________________________________________________________________________________________________              
                                           | 4| 4| 6| 7| 5| 4| 5| 7| 6| 6| 4| 7| 6| 6| 7| 5| 5| 5| 6| 6| 6| 6| 5| 5| 6|             
                             DAY ON TEST   | 1| 7| 1| 3| 8| 6| 4| 1| 8| 2| 6| 3| 6| 4| 0| 8| 0| 1| 3| 5| 2| 3| 8| 5| 8|             
                                           | 7| 8| 2| 6| 2| 6| 4| 0| 3| 0| 0| 6| 2| 1| 4| 9| 1| 8| 3| 5| 5| 5| 9| 7| 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                   | 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8|             
                               ANIMAL ID   | 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2|             
    .1MG/KG                                | 0| 0| 0| 0| 0| 0| 0| 0| 0| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 2| 2| 2| 2| 2| 2|             
    NNK/AIR                                | 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5|             
 _____________________________________________________________________________________________________________________|             
 HEMATOPOIETIC SYSTEM - cont               |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Bone Marrow                             |                                                                          |             
                                            __________________________________________________________________________|             
   Lymph Node                              |                +        +                                      +     +   |             
      Renal, Infiltration Cellular, Plasma |                                                                          |             
          Cell                             |                                                                      2   |             
      Renal, Inflammation, Granulomatous   |                2                                               2         |             
                                            __________________________________________________________________________|             
   Lymph Node, Bronchial                   | +  M  M  M  +  M  M  M  +  +  M  +  +  +  +  +  +  +  M  +  +  M  +  +  +|             
      Hemorrhage                           |                            2                                             |             
      Necrosis                             |                                                                          |             
                                            __________________________________________________________________________|             
   Lymph Node, Mandibular                  |                         +  +              +     +                        |             
                                            __________________________________________________________________________|             
   Lymph Node, Mesenteric                  |                +        +                 +     +                        |             
      Inflammation, Granulomatous          |                2                                                         |             
                                            __________________________________________________________________________|             
   Lymph Node, Mediastinal                 | M  +  +  +  +  M  +  +  +  +  +  +  +  +  +  +  +  +  M  M  +  +  +  +  +|             
      Hemorrhage                           |                                                                          |             
      Infiltration Cellular, Plasma Cell   |                                                                          |             
      Necrosis                             |                                                                          |             
                                            __________________________________________________________________________|             
   Spleen                                  |       +  +  +     +  +  +  +  +  +  +  +  +  +  +     +  +        +      |             
      Fibrosis                             |          2              3  3     2           3        2                  |             
      Hematopoietic Cell Proliferation     |                                                                          |             
      Hemorrhage                           |                                              3           4               |             
      Necrosis                             |                                                          4               |             
                                            __________________________________________________________________________|             
   Thymus                                  |                                                                          |             
 _____________________________________________________________________________________________________________________|             
 INTEGUMENTARY SYSTEM                      |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Mammary Gland                           |          +           +  +                                                |             
      Galactocele                          |          3           3  4                                                |             
      Hyperplasia                          |                                                                          |             
      Inflammation, Chronic                |                      3                                                   |             
                                            __________________________________________________________________________|             
   Skin                                    | +  +     +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Hyperkeratosis                       |                                                                          |             
      Inflammation, Chronic                |                                                       3                  |             
      Ulcer                                |                3  3                                                      |             
      Prepuce, Inflammation, Suppurative   |                                                                          |             
      Subcutaneous Tissue, Skin, Site of   |                                                                          |             
          Application, Inflammation,       |                                                                          |             
          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|             
 _____________________________________________________________________________________________________________________|             
 MUSCULOSKELETAL SYSTEM                    |                                                                          |             
                                           |                                                                          |             
    None                                   |                                                                          |             
 _____________________________________________________________________________________________________________________|             
 NERVOUS SYSTEM                            |                                                                          |             
                                           |                                                                          |             
    None                                   |                                                                          |             
 _____________________________________________________________________________________________________________________|             
 RESPIRATORY SYSTEM                        |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Larynx                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
 _____________________________________________________________________________________________________________________|             
                                                             Page  10                                                               
NTP Experiment-Test: 88034-07                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09
Study Type: CHRONIC                                             OZONE/NNK                                         Date: 04/23/97  
Route: RESPIRATORY EXPOSURE WHOLE BODY                                                                            Time: 08:17:56  
                                                                                                                                    
 _____________________________________________________________________________________________________________________              
                                           | 4| 4| 6| 7| 5| 4| 5| 7| 6| 6| 4| 7| 6| 6| 7| 5| 5| 5| 6| 6| 6| 6| 5| 5| 6|             
                             DAY ON TEST   | 1| 7| 1| 3| 8| 6| 4| 1| 8| 2| 6| 3| 6| 4| 0| 8| 0| 1| 3| 5| 2| 3| 8| 5| 8|             
                                           | 7| 8| 2| 6| 2| 6| 4| 0| 3| 0| 0| 6| 2| 1| 4| 9| 1| 8| 3| 5| 5| 5| 9| 7| 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                   | 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8|             
                               ANIMAL ID   | 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2|             
    .1MG/KG                                | 0| 0| 0| 0| 0| 0| 0| 0| 0| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 2| 2| 2| 2| 2| 2|             
    NNK/AIR                                | 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                 |                                                                          |             
                                           |                                                                          |             
      Foreign Body                         |                            X                    X                        |             
      Inflammation, Suppurative            |                1                                2                        |             
                                            __________________________________________________________________________|             
   Lung                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Congestion                           |                                                                          |             
      Fibrosis, Focal                      |                      2                                                   |             
      Hemorrhage                           |                                                             3     2      |             
      Alveolar Epithelium, Hyperplasia,    |                                                                          |             
           Atypical                        |                      3     2     2     2           1           1         |             
      Alveolus, Infiltration Cellular,     |                                                                          |             
           Focal, Histiocyte               |                                                    1                     |             
      Alveolus, Infiltration Cellular,     |                                                                          |             
           Histiocyte                      |                      2                                                   |             
      Interstitium, Inflammation, Chronic, |                                                                          |             
           Diffuse                         |                                                                          |             
                                            __________________________________________________________________________|             
   Nose                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Inflammation, Chronic                |          1                                                               |             
      Inflammation, Suppurative            |                      1                                                   |             
      Lateral Wall, Hyperplasia            |                      1  2                 2                              |             
      Olfactory Epithelium, Degeneration,  |                                                                          |             
           Hyaline                         | 1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  2  1  1  1  1  1  1  2  2  1|             
      Olfactory Epithelium, Metaplasia     |          1           1                    1           2                  |             
                                            __________________________________________________________________________|             
   Trachea                                 | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
 _____________________________________________________________________________________________________________________|             
 SPECIAL SENSES SYSTEM                     |                                                                          |             
                                           |                                                                          |             
    None                                   |                                                                          |             
 _____________________________________________________________________________________________________________________|             
 URINARY SYSTEM                            |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Kidney                                  |          +  +        +  +  +              +  +        +     +  +         |             
      Nephropathy                          |          4  3        3  3  3              2  3        2     4  4         |             
                                            __________________________________________________________________________|             
   Urinary Bladder                         | +                       +                                                |             
      Inflammation, Chronic Active         |                         3                                                |             
 _____________________________________________________________________________________________________________________|             
                                                             Page  11                                                               
NTP Experiment-Test: 88034-07                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09
Study Type: CHRONIC                                             OZONE/NNK                                         Date: 04/23/97  
Route: RESPIRATORY EXPOSURE WHOLE BODY                                                                            Time: 08:17:56  
                                                                                                                                    
 __________________________________________________________________________________________________________________________________ 
                                           | 5| 7| 7| 5| 6| 4| 7| 6| 7| 5| 6| 7| 6| 6| 7| 6| 5| 6| 6| 6| 5| 7| 5|     |            |
                             DAY ON TEST   | 7| 3| 1| 5| 9| 4| 0| 1| 1| 0| 6| 3| 1| 3| 3| 7| 2| 3| 7| 4| 5| 3| 5|     |            |
                                           | 9| 6| 5| 5| 7| 4| 4| 7| 6| 1| 3| 6| 3| 9| 6| 3| 9| 5| 1| 1| 1| 6| 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|     |      O     |
   FISCHER 344 RATS MALE                   | 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8|     |      T     |
                               ANIMAL ID   | 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2|     |      A     |
    .1MG/KG                                | 2| 2| 2| 2| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 4| 4| 4| 4| 4| 4| 4| 4| 4|     |      L     |
    NNK/AIR                                | 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8|     |            |
 __________________________________________________________________________________________________________________________________ 
 ALIMENTARY SYSTEM                         |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Intestine Large, Cecum                  |                                                                          |   1        |
                                            __________________________________________________________________________|____________|
   Intestine Small, Ileum                  |                                  +                                       |   1        |
                                            __________________________________________________________________________|____________|
   Liver                                   | +  +        +        +        +  +  +  +  +        +  +  +  +            |  27        |
      Angiectasis                          |                                                          2               |      1  2.0|
      Degeneration, Cystic                 |    2                             2                                       |      3  2.0|
      Hepatodiaphragmatic Nodule           |                                                                          |      2     |
      Hyperplasia, Focal                   |                                                                          |      1  4.0|
      Vacuolization Cytoplasmic, Focal     |                      2                                                   |      1  2.0|
      Vacuolization Cytoplasmic            |                                     2  2           3                     |      4  2.5|
      Bile Duct, Hyperplasia               |    2                                                                     |      2  2.5|
      Centrilobular, Necrosis              |                                                       3                  |      1  3.0|
                                            __________________________________________________________________________|____________|
   Mesentery                               | +                                +           +           +               |  10        |
      Fat, Necrosis                        |                                  2           3           3               |      9  2.9|
                                            __________________________________________________________________________|____________|
   Oral Mucosa                             |             +                                +                           |   4        |
      Pharyngeal, Hyperplasia, Squamous    |             3                                                            |      2  3.0|
                                            __________________________________________________________________________|____________|
   Stomach, Glandular                      |                +                                                         |   1        |
                                            __________________________________________________________________________|____________|
   Tongue                                  |                                                       +                  |   1        |
 _____________________________________________________________________________________________________________________|            |
 CARDIOVASCULAR SYSTEM                     |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Heart                                   |                                                                          |   1        |
      Necrosis                             |                                                                          |      1  3.0|
 _____________________________________________________________________________________________________________________|            |
 ENDOCRINE SYSTEM                          |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Adrenal Cortex                          |                   +                                                      |   1        |
                                            __________________________________________________________________________|____________|
   Islets, Pancreatic                      |                   +                          +              +            |   5        |
                                            __________________________________________________________________________|____________|
   Pituitary Gland                         |          +  +  +  +  +  +     +  +  +  +  +  +  +  +     +  +     +      |  35        |
      Pars Distalis, Hyperplasia           |             4                                                            |      1  4.0|
                                            __________________________________________________________________________|____________|
   Thyroid Gland                           |                                                                          |   2        |
 _____________________________________________________________________________________________________________________|            |
 GENERAL BODY SYSTEM                       |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Peritoneum                              | +        +           +  +  +  +     +  +  +  +        +                  |  24        |
      Inflammation, Chronic                | 1        1           1  1  1  1     1  1  1  1        1                  |     24  1.0|
 _____________________________________________________________________________________________________________________|            |
 GENITAL SYSTEM                            |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Penis                                   |             +                                      +                     |   4        |
      Inflammation, Chronic Active         |                                                    2                     |      2  2.5|
                                            __________________________________________________________________________|____________|
   Preputial Gland                         |                            +                 +                           |   6        |
      Inflammation, Chronic Active         |                                                                          |      2  3.0|
                                            __________________________________________________________________________|____________|
   Prostate                                |                                                    +                     |   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  12                                                               
NTP Experiment-Test: 88034-07                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09
Study Type: CHRONIC                                             OZONE/NNK                                         Date: 04/23/97  
Route: RESPIRATORY EXPOSURE WHOLE BODY                                                                            Time: 08:17:56  
                                                                                                                                    
 __________________________________________________________________________________________________________________________________ 
                                           | 5| 7| 7| 5| 6| 4| 7| 6| 7| 5| 6| 7| 6| 6| 7| 6| 5| 6| 6| 6| 5| 7| 5|     |            |
                             DAY ON TEST   | 7| 3| 1| 5| 9| 4| 0| 1| 1| 0| 6| 3| 1| 3| 3| 7| 2| 3| 7| 4| 5| 3| 5|     |            |
                                           | 9| 6| 5| 5| 7| 4| 4| 7| 6| 1| 3| 6| 3| 9| 6| 3| 9| 5| 1| 1| 1| 6| 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|     |      O     |
   FISCHER 344 RATS MALE                   | 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8|     |      T     |
                               ANIMAL ID   | 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2|     |      A     |
    .1MG/KG                                | 2| 2| 2| 2| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 4| 4| 4| 4| 4| 4| 4| 4| 4|     |      L     |
    NNK/AIR                                | 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8|     |            |
 __________________________________________________________________________________________________________________________________ 
 GENITAL SYSTEM - cont                     |                                                                          |            |
                                           |                                                                          |            |
      Inflammation, Suppurative            |                                                    4                     |      2  3.5|
                                            __________________________________________________________________________|____________|
   Testes                                  |    +  +                 +                                      +         |   9        |
      Atrophy                              |                                                                          |      1  3.0|
 _____________________________________________________________________________________________________________________|            |
 HEMATOPOIETIC SYSTEM                      |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Bone Marrow                             |                               +                                          |   1        |
                                            __________________________________________________________________________|____________|
   Lymph Node                              | +                             +                             +            |   7        |
      Renal, Infiltration Cellular, Plasma |                                                                          |            |
          Cell                             |                                                                          |      1  2.0|
      Renal, Inflammation, Granulomatous   |                                                                          |      2  2.0|
                                            __________________________________________________________________________|____________|
   Lymph Node, Bronchial                   | +  +  +  +  M  M  +  +  +  M  +  +  +  M  +  M  M  +     +  +  +  +      |  32        |
      Hemorrhage                           |                                                                          |      1  2.0|
      Necrosis                             |       4                                                                  |      1  4.0|
                                            __________________________________________________________________________|____________|
   Lymph Node, Mandibular                  | +     +                       +                             +            |   8        |
                                            __________________________________________________________________________|____________|
   Lymph Node, Mesenteric                  | +  +                       +  +                                          |   8        |
      Inflammation, Granulomatous          |                                                                          |      1  2.0|
                                            __________________________________________________________________________|____________|
   Lymph Node, Mediastinal                 | +  +  +  +  +  +  M  I  M  +  +  M  +  M  +  +  +  +  +  +  +  M  I      |  37        |
      Hemorrhage                           |                                                       3                  |      1  3.0|
      Infiltration Cellular, Plasma Cell   |                                     2                                    |      1  2.0|
      Necrosis                             |       4                                                                  |      1  4.0|
                                            __________________________________________________________________________|____________|
   Spleen                                  | +  +  +     +     +     +  +  +  +        +  +     +     +  +  +         |  32        |
      Fibrosis                             |    2  2           2     2  2     3                       3     3         |     14  2.4|
      Hematopoietic Cell Proliferation     |                                              2                           |      1  2.0|
      Hemorrhage                           |                                                                          |      2  3.5|
      Necrosis                             |                                                                          |      1  4.0|
                                            __________________________________________________________________________|____________|
   Thymus                                  |                               +                                          |   1        |
 _____________________________________________________________________________________________________________________|            |
 INTEGUMENTARY SYSTEM                      |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Mammary Gland                           |    +                                      +                              |   5        |
      Galactocele                          |                                                                          |      3  3.3|
      Hyperplasia                          |    3                                      3                              |      2  3.0|
      Inflammation, Chronic                |                                                                          |      1  3.0|
                                            __________________________________________________________________________|____________|
   Skin                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  47        |
      Hyperkeratosis                       |    3                                         3                           |      2  3.0|
      Inflammation, Chronic                |                                                                          |      1  3.0|
      Ulcer                                |                                                                          |      2  3.0|
      Prepuce, Inflammation, Suppurative   |             3                                                            |      1  3.0|
      Subcutaneous Tissue, Skin, Site of   |                                                                          |            |
          Application, Inflammation,       |                                                                          |            |
 __________________________________________________________________________________________________________________________________ 
  * : Total animals with tissue examined microscopically; total animals with lesion and mean severity grade                         
  + : Tissue examined microscopically                M : Missing tissue                        1-4 : Lesion qualified as:           
  X : Lesion present but not qualified               A : Autolysis precludes examination               1) Minimal  3) Moderate      
  I : Insufficient tissue                        BLANK : Not examined                                  2) Mild     4) Marked        
                                                             Page  13                                                               
NTP Experiment-Test: 88034-07                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09
Study Type: CHRONIC                                             OZONE/NNK                                         Date: 04/23/97  
Route: RESPIRATORY EXPOSURE WHOLE BODY                                                                            Time: 08:17:56  
                                                                                                                                    
 __________________________________________________________________________________________________________________________________ 
                                           | 5| 7| 7| 5| 6| 4| 7| 6| 7| 5| 6| 7| 6| 6| 7| 6| 5| 6| 6| 6| 5| 7| 5|     |            |
                             DAY ON TEST   | 7| 3| 1| 5| 9| 4| 0| 1| 1| 0| 6| 3| 1| 3| 3| 7| 2| 3| 7| 4| 5| 3| 5|     |            |
                                           | 9| 6| 5| 5| 7| 4| 4| 7| 6| 1| 3| 6| 3| 9| 6| 3| 9| 5| 1| 1| 1| 6| 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|     |      O     |
   FISCHER 344 RATS MALE                   | 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8|     |      T     |
                               ANIMAL ID   | 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2|     |      A     |
    .1MG/KG                                | 2| 2| 2| 2| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 4| 4| 4| 4| 4| 4| 4| 4| 4|     |      L     |
    NNK/AIR                                | 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8|     |            |
 __________________________________________________________________________________________________________________________________ 
 INTEGUMENTARY SYSTEM - cont               |                                                                          |            |
                                           |                                                                          |            |
          Chronic                          | 1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1      |     47  1.0|
 _____________________________________________________________________________________________________________________|            |
 MUSCULOSKELETAL SYSTEM                    |                                                                          |            |
                                           |                                                                          |            |
    None                                   |                                                                          |            |
 _____________________________________________________________________________________________________________________|            |
 NERVOUS SYSTEM                            |                                                                          |            |
                                           |                                                                          |            |
    None                                   |                                                                          |            |
 _____________________________________________________________________________________________________________________|            |
 RESPIRATORY SYSTEM                        |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Larynx                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
      Foreign Body                         |                                                                          |      2     |
      Inflammation, Suppurative            |                1                    1                                    |      4  1.3|
                                            __________________________________________________________________________|____________|
   Lung                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
      Congestion                           |                                                 1                 1      |      2  1.0|
      Fibrosis, Focal                      |                                                                          |      1  2.0|
      Hemorrhage                           |                                                                          |      2  2.5|
      Alveolar Epithelium, Hyperplasia,    |                                                                          |            |
           Atypical                        |             1     2        2     2                                       |     10  1.8|
      Alveolus, Infiltration Cellular,     |                                                                          |            |
           Focal, Histiocyte               |                                                                          |      1  1.0|
      Alveolus, Infiltration Cellular,     |                                                                          |            |
           Histiocyte                      |                                                                          |      1  2.0|
      Interstitium, Inflammation, Chronic, |                                                                          |            |
           Diffuse                         |                                                       2                  |      1  2.0|
                                            __________________________________________________________________________|____________|
   Nose                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
      Inflammation, Chronic                |                                                                          |      1  1.0|
      Inflammation, Suppurative            |                                                                          |      1  1.0|
      Lateral Wall, Hyperplasia            | 1                                                                        |      4  1.5|
      Olfactory Epithelium, Degeneration,  |                                                                          |            |
           Hyaline                         | 1  1  1  1  1  1  1  2  1  1  1  1  2  1  1  1  2  2  1  2  2  1  1      |     48  1.2|
      Olfactory Epithelium, Metaplasia     |                                                                          |      4  1.3|
                                            __________________________________________________________________________|____________|
   Trachea                                 | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
 _____________________________________________________________________________________________________________________|            |
 SPECIAL SENSES SYSTEM                     |                                                                          |            |
                                           |                                                                          |            |
    None                                   |                                                                          |            |
 _____________________________________________________________________________________________________________________|            |
 URINARY SYSTEM                            |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Kidney                                  |       +  +  +        +  +     +  +  +  +  +  +                 +         |  22        |
      Nephropathy                          |       3  3  3        3  4     2  4  3  3  3  3                 4         |     22  3.1|
 __________________________________________________________________________________________________________________________________ 
  * : Total animals with tissue examined microscopically; total animals with lesion and mean severity grade                         
  + : Tissue examined microscopically                M : Missing tissue                        1-4 : Lesion qualified as:           
  X : Lesion present but not qualified               A : Autolysis precludes examination               1) Minimal  3) Moderate      
  I : Insufficient tissue                        BLANK : Not examined                                  2) Mild     4) Marked        
                                                             Page  14                                                               
NTP Experiment-Test: 88034-07                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09
Study Type: CHRONIC                                             OZONE/NNK                                         Date: 04/23/97  
Route: RESPIRATORY EXPOSURE WHOLE BODY                                                                            Time: 08:17:56  
                                                                                                                                    
 __________________________________________________________________________________________________________________________________ 
                                           | 5| 7| 7| 5| 6| 4| 7| 6| 7| 5| 6| 7| 6| 6| 7| 6| 5| 6| 6| 6| 5| 7| 5|     |            |
                             DAY ON TEST   | 7| 3| 1| 5| 9| 4| 0| 1| 1| 0| 6| 3| 1| 3| 3| 7| 2| 3| 7| 4| 5| 3| 5|     |            |
                                           | 9| 6| 5| 5| 7| 4| 4| 7| 6| 1| 3| 6| 3| 9| 6| 3| 9| 5| 1| 1| 1| 6| 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|     |      O     |
   FISCHER 344 RATS MALE                   | 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8|     |      T     |
                               ANIMAL ID   | 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2| 2|     |      A     |
    .1MG/KG                                | 2| 2| 2| 2| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 4| 4| 4| 4| 4| 4| 4| 4| 4|     |      L     |
    NNK/AIR                                | 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8|     |            |
 __________________________________________________________________________________________________________________________________ 
 URINARY SYSTEM - cont                     |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Urinary Bladder                         |                                                                          |   2        |
      Inflammation, Chronic Active         |                                                                          |      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  15                                                               
NTP Experiment-Test: 88034-07                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09
Study Type: CHRONIC                                             OZONE/NNK                                         Date: 04/23/97  
Route: RESPIRATORY EXPOSURE WHOLE BODY                                                                            Time: 08:17:56  
                                                                                                                                    
 _____________________________________________________________________________________________________________________              
                                           | 5| 5| 6| 6| 7| 6| 6| 5| 7| 7| 5| 6| 6| 6| 4| 5| 6| 6| 6| 5| 6| 6| 7| 5| 6|             
                             DAY ON TEST   | 6| 5| 0| 7| 3| 8| 6| 2| 3| 1| 2| 1| 3| 6| 2| 9| 0| 8| 8| 7| 0| 9| 3| 4| 0|             
                                           | 2| 1| 3| 8| 6| 3| 3| 8| 6| 5| 9| 7| 9| 1| 9| 0| 3| 3| 7| 9| 4| 5| 6| 4| 2|             
 _____________________________________________________________________________________________________________________|             
                                           | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|             
   FISCHER 344 RATS MALE                   | 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8|             
                               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|             
    1 MG/KG                                | 0| 0| 0| 0| 0| 0| 0| 0| 0| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 2| 2| 2| 2| 2| 2|             
    NNK/AIR                                | 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                         |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Intestine Large, Colon                  |       +                                                                  |             
      Lymphoid Tissue, Hyperplasia,        |                                                                          |             
          Lymphoid                         |       2                                                                  |             
                                            __________________________________________________________________________|             
   Intestine Large, Cecum                  |                                                                          |             
      Ulcer                                |                                                                          |             
                                            __________________________________________________________________________|             
   Intestine Small, Jejunum                | +                                                                        |             
                                            __________________________________________________________________________|             
   Intestine Small, Ileum                  |       +                                                                  |             
      Hyperplasia, Lymphoid                |       2                                                                  |             
                                            __________________________________________________________________________|             
   Liver                                   | +  +  +  +  +  +  +  +  +  +     +  +  +  +  +  +  +  +  +  +  +        +|             
      Degeneration, Cystic                 |                   2     3  2                             2               |             
      Hepatodiaphragmatic Nodule           |                                                                          |             
      Hyperplasia, Focal                   |                                  4                          3           4|             
      Necrosis, Focal                      |                                     2     2                              |             
      Vacuolization Cytoplasmic            |                                           2                 2            |             
                                            __________________________________________________________________________|             
   Mesentery                               |    +                       +                 +        +                  |             
      Fat, Necrosis                        |    1                       3                 3        3                  |             
                                            __________________________________________________________________________|             
   Pancreas                                |                                                                          |             
      Artery, Inflammation, Chronic        |                                                                          |             
                                            __________________________________________________________________________|             
   Stomach, Forestomach                    |                                                                         +|             
                                            __________________________________________________________________________|             
   Stomach, Glandular                      |       +                                                                 +|             
      Necrosis                             |                                                                         2|             
 _____________________________________________________________________________________________________________________|             
 CARDIOVASCULAR SYSTEM                     |                                                                          |             
                                           |                                                                          |             
    None                                   |                                                                          |             
 _____________________________________________________________________________________________________________________|             
 ENDOCRINE SYSTEM                          |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Adrenal Cortex                          |                            +           +        +                        |             
      Vacuolization Cytoplasmic            |                                                                          |             
                                            __________________________________________________________________________|             
   Adrenal Medulla                         |                                                                          |             
                                            __________________________________________________________________________|             
   Islets, Pancreatic                      |                                                                          |             
                                            __________________________________________________________________________|             
   Pituitary Gland                         |    +     +  +  +  +  +     +  +  +  +  +  +  M  +        +  +     +  +  +|             
      Pars Distalis, Hyperplasia           |                                                                          |             
                                            __________________________________________________________________________|             
   Thyroid Gland                           |                   +                                                      |             
 _____________________________________________________________________________________________________________________|             
 GENERAL BODY SYSTEM                       |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Peritoneum                              |    +  +  +     +  +  +  +        +  +  +  +  +  +  +     +     +  +      |             
      Inflammation, Chronic                |    1  1  1     1  1  1  1        1  1  1  1  1  1  1     1     1  1      |             
 _____________________________________________________________________________________________________________________|             
 GENITAL SYSTEM                            |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Penis                                   |       +                             +  +                                +|             
      Inflammation, Chronic Active         |       2                                                                 2|             
                                            __________________________________________________________________________|             
   Preputial Gland                         | +  +        +                 +     +                                +   |             
      Inflammation, Chronic Active         |             2                 4     2                                2   |             
                                            __________________________________________________________________________|             
   Seminal Vesicle                         |                                                                          |             
 _____________________________________________________________________________________________________________________|             
                                                             Page  16                                                               
NTP Experiment-Test: 88034-07                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09
Study Type: CHRONIC                                             OZONE/NNK                                         Date: 04/23/97  
Route: RESPIRATORY EXPOSURE WHOLE BODY                                                                            Time: 08:17:56  
                                                                                                                                    
 _____________________________________________________________________________________________________________________              
                                           | 5| 5| 6| 6| 7| 6| 6| 5| 7| 7| 5| 6| 6| 6| 4| 5| 6| 6| 6| 5| 6| 6| 7| 5| 6|             
                             DAY ON TEST   | 6| 5| 0| 7| 3| 8| 6| 2| 3| 1| 2| 1| 3| 6| 2| 9| 0| 8| 8| 7| 0| 9| 3| 4| 0|             
                                           | 2| 1| 3| 8| 6| 3| 3| 8| 6| 5| 9| 7| 9| 1| 9| 0| 3| 3| 7| 9| 4| 5| 6| 4| 2|             
 _____________________________________________________________________________________________________________________|             
                                           | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|             
   FISCHER 344 RATS MALE                   | 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8|             
                               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|             
    1 MG/KG                                | 0| 0| 0| 0| 0| 0| 0| 0| 0| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 2| 2| 2| 2| 2| 2|             
    NNK/AIR                                | 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                     |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Testes                                  |          +        +                 +              +  +  +              +|             
      Atrophy                              |                   3                                                      |             
 _____________________________________________________________________________________________________________________|             
 HEMATOPOIETIC SYSTEM                      |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Lymph Node                              | +     +  +  +  +     +                 +        +  +     +     +  +  +  +|             
      Pancreatic, Inflammation,            |                                                                          |             
          Granulomatous                    |                      2                                                   |             
      Renal, Hemorrhage                    |                                                                   3     3|             
      Renal, Infiltration Cellular, Plasma |                                                                          |             
          Cell                             |                      1                                         2  2      |             
      Renal, Inflammation, Granulomatous   |                                                                      2   |             
                                            __________________________________________________________________________|             
   Lymph Node, Bronchial                   | +  +  +  +  M  M  M  M  M  M  +  +  M  +  I  +  +  +  +  M  M  M  M  M  +|             
                                            __________________________________________________________________________|             
   Lymph Node, Mandibular                  | +     +  +     +              +     +  +                    +           +|             
      Infiltration Cellular, Plasma Cell   |                               3                             2           3|             
      Necrosis                             |                                     4                                    |             
                                            __________________________________________________________________________|             
   Lymph Node, Mesenteric                  |          +                             +                 +               |             
                                            __________________________________________________________________________|             
   Lymph Node, Mediastinal                 | M  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  M  +  +  +  +  +  +  +|             
      Fibrosis                             |                         3                                                |             
      Hemorrhage                           |                   3                                                  2   |             
      Infiltration Cellular, Plasma Cell   |                               3                                          |             
      Necrosis                             |                                     4                                    |             
                                            __________________________________________________________________________|             
   Spleen                                  | +     +  +  +  +     +  +  +  +  +  +  +  +  +  +  +  +     +  +  +  +  +|             
      Accessory Spleen                     |                            X                                         X   |             
      Atrophy                              |                                     3                                    |             
      Fibrosis                             |             3  3                          2           2                 2|             
      Hematopoietic Cell Proliferation     |                               2                                          |             
      Necrosis                             |                                                             4            |             
                                            __________________________________________________________________________|             
   Thymus                                  | +                                                  +                     |             
 _____________________________________________________________________________________________________________________|             
 INTEGUMENTARY SYSTEM                      |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Mammary Gland                           |             +        +                          +                        |             
      Galactocele                          |             2        3                          3                        |             
      Hyperplasia                          |                                                                          |             
      Inflammation, Chronic                |                                                 3                        |             
                                            __________________________________________________________________________|             
   Skin                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Hyperkeratosis                       |                                  2                                3      |             
      Inflammation, Chronic                |                            2                       3                     |             
      Inflammation, Suppurative            |                         3                                                |             
      Ulcer                                |                      2                                                   |             
      Prepuce, Inflammation, Suppurative   |                                     2                                    |             
      Subcutaneous Tissue, Skin, Site of   |                                                                          |             
          Application, Inflammation,       |                                                                          |             
          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  1|             
 _____________________________________________________________________________________________________________________|             
 MUSCULOSKELETAL SYSTEM                    |                                                                          |             
                                           |                                                                          |             
    None                                   |                                                                          |             
 _____________________________________________________________________________________________________________________|             
                                                             Page  17                                                               
NTP Experiment-Test: 88034-07                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09
Study Type: CHRONIC                                             OZONE/NNK                                         Date: 04/23/97  
Route: RESPIRATORY EXPOSURE WHOLE BODY                                                                            Time: 08:17:56  
                                                                                                                                    
 _____________________________________________________________________________________________________________________              
                                           | 5| 5| 6| 6| 7| 6| 6| 5| 7| 7| 5| 6| 6| 6| 4| 5| 6| 6| 6| 5| 6| 6| 7| 5| 6|             
                             DAY ON TEST   | 6| 5| 0| 7| 3| 8| 6| 2| 3| 1| 2| 1| 3| 6| 2| 9| 0| 8| 8| 7| 0| 9| 3| 4| 0|             
                                           | 2| 1| 3| 8| 6| 3| 3| 8| 6| 5| 9| 7| 9| 1| 9| 0| 3| 3| 7| 9| 4| 5| 6| 4| 2|             
 _____________________________________________________________________________________________________________________|             
                                           | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|             
   FISCHER 344 RATS MALE                   | 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8|             
                               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|             
    1 MG/KG                                | 0| 0| 0| 0| 0| 0| 0| 0| 0| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 2| 2| 2| 2| 2| 2|             
    NNK/AIR                                | 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5|             
 _____________________________________________________________________________________________________________________|             
 NERVOUS SYSTEM                            |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Brain                                   |                                                                          |             
      Hemorrhage                           |                                                                          |             
 _____________________________________________________________________________________________________________________|             
 RESPIRATORY SYSTEM                        |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Larynx                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
                                            __________________________________________________________________________|             
   Lung                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Congestion                           |                               1                                          |             
      Fibrosis, Focal                      |                                                                          |             
      Hemorrhage                           |                                                                   2      |             
      Alveolar Epithelium, Hyperplasia,    |                                                                          |             
           Atypical                        | 1  1     2  4  3  2  1  2  3     2  2  3  2  3     2  3  2  2  2  2  2  1|             
      Alveolus, Infiltration Cellular,     |                                                                          |             
           Focal, Histiocyte               |                                                                          |             
      Alveolus, Infiltration Cellular,     |                                                                          |             
           Histiocyte                      |                                           2                 3     3  2   |             
      Serosa, Fibrosis                     |                                                                          |             
                                            __________________________________________________________________________|             
   Nose                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Inflammation, Suppurative            |       3                                3     3           1               |             
      Goblet Cell, Lateral Wall,           |                                                                          |             
          Hyperplasia                      |                                        2           1                     |             
      Lateral Wall, Hyperplasia            | 1     2                                      3     2                     |             
      Nasopharyngeal Duct, Infiltration    |                                                                          |             
          Cellular, Mixed Cell             |                                                                          |             
      Olfactory Epithelium, Degeneration,  |                                                                          |             
           Hyaline                         | 1  1  1  1  1  1  1  1  1  1  1  2  1  1  1  1  2  1  1     1     1  1  1|             
      Olfactory Epithelium, Metaplasia     |                                                       1                  |             
                                            __________________________________________________________________________|             
   Trachea                                 | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
 _____________________________________________________________________________________________________________________|             
 SPECIAL SENSES SYSTEM                     |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Eye                                     |                                                 +                        |             
      Cataract                             |                                                 2                        |             
 _____________________________________________________________________________________________________________________|             
 URINARY SYSTEM                            |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Kidney                                  | +  +        +  +  +        +           +  +        +     +     +  +     +|             
      Infarct                              |                                                                         3|             
      Nephropathy                          | 3  2        3  3  4        4           3  3        3     2     4  4     3|             
                                            __________________________________________________________________________|             
   Ureter                                  |                                                 +                        |             
                                            __________________________________________________________________________|             
   Urinary Bladder                         |                                                                          |             
      Hemorrhage                           |                                                                          |             
      Inflammation, Suppurative            |                                                                          |             
 _____________________________________________________________________________________________________________________|             
                                                             Page  18                                                               
NTP Experiment-Test: 88034-07                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09
Study Type: CHRONIC                                             OZONE/NNK                                         Date: 04/23/97  
Route: RESPIRATORY EXPOSURE WHOLE BODY                                                                            Time: 08:17:56  
                                                                                                                                    
 __________________________________________________________________________________________________________________________________ 
                                           | 6| 6| 7| 6| 6| 7| 4| 5| 4| 7| 5| 5| 4| 6| 4| 6| 6| 6| 5| 6| 5| 5| 6|     |            |
                             DAY ON TEST   | 8| 4| 0| 0| 0| 1| 8| 4| 5| 3| 9| 3| 8| 9| 8| 7| 8| 0| 8| 6| 5| 8| 4|     |            |
                                           | 3| 5| 4| 3| 5| 2| 6| 0| 0| 6| 0| 3| 9| 5| 8| 7| 3| 5| 3| 9| 0| 3| 1|     |      T (*) |
 _____________________________________________________________________________________________________________________|            |
                                           | 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                   | 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8|     |      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|     |      A     |
    1 MG/KG                                | 2| 2| 2| 2| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 4| 4| 4| 4| 4| 4| 4| 4| 4|     |      L     |
    NNK/AIR                                | 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8|     |            |
 __________________________________________________________________________________________________________________________________ 
 ALIMENTARY SYSTEM                         |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Intestine Large, Colon                  |                                                                          |   1        |
      Lymphoid Tissue, Hyperplasia,        |                                                                          |            |
          Lymphoid                         |                                                                          |      1  2.0|
                                            __________________________________________________________________________|____________|
   Intestine Large, Cecum                  |                   +           A                                          |   1        |
      Ulcer                                |                   3                                                      |      1  3.0|
                                            __________________________________________________________________________|____________|
   Intestine Small, Jejunum                |                                                                          |   1        |
                                            __________________________________________________________________________|____________|
   Intestine Small, Ileum                  |                                                                          |   1        |
      Hyperplasia, Lymphoid                |                                                                          |      1  2.0|
                                            __________________________________________________________________________|____________|
   Liver                                   | +  +  +  +  +  +  +  +        +        +  +  +  +  +  +  +  +            |  39        |
      Degeneration, Cystic                 |    3                                   2     3                           |      7  2.4|
      Hepatodiaphragmatic Nodule           |                                           X                              |      1     |
      Hyperplasia, Focal                   |          4                                                               |      4  3.8|
      Necrosis, Focal                      |    3                                                                     |      3  2.3|
      Vacuolization Cytoplasmic            |                                                                          |      2  2.0|
                                            __________________________________________________________________________|____________|
   Mesentery                               |                      +     +     +        +                              |   8        |
      Fat, Necrosis                        |                                  2        2                              |      6  2.3|
                                            __________________________________________________________________________|____________|
   Pancreas                                |                                     +                                    |   1        |
      Artery, Inflammation, Chronic        |                                     1                                    |      1  1.0|
                                            __________________________________________________________________________|____________|
   Stomach, Forestomach                    |                                                                          |   1        |
                                            __________________________________________________________________________|____________|
   Stomach, Glandular                      |                                                       +                  |   3        |
      Necrosis                             |                                                                          |      1  2.0|
 _____________________________________________________________________________________________________________________|            |
 CARDIOVASCULAR SYSTEM                     |                                                                          |            |
                                           |                                                                          |            |
    None                                   |                                                                          |            |
 _____________________________________________________________________________________________________________________|            |
 ENDOCRINE SYSTEM                          |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Adrenal Cortex                          |                                        +                                 |   4        |
      Vacuolization Cytoplasmic            |                                        3                                 |      1  3.0|
                                            __________________________________________________________________________|____________|
   Adrenal Medulla                         |                                              +                           |   1        |
                                            __________________________________________________________________________|____________|
   Islets, Pancreatic                      |                                        +                                 |   1        |
                                            __________________________________________________________________________|____________|
   Pituitary Gland                         | +     +  +  +  +  +        +  +  +  +  +  +     +  +           +  +      |  34        |
      Pars Distalis, Hyperplasia           |       2                                   3                              |      2  2.5|
                                            __________________________________________________________________________|____________|
   Thyroid Gland                           |                                                                          |   1        |
 _____________________________________________________________________________________________________________________|            |
 GENERAL BODY SYSTEM                       |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Peritoneum                              | +  +  +  +  +  +        +  +           +  +  +     +     +  +     +      |  32        |
      Inflammation, Chronic                | 1  1  1  1  1  1        1  1           1  1  1     1     1  1     1      |     32  1.0|
 _____________________________________________________________________________________________________________________|            |
 GENITAL 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  19                                                               
NTP Experiment-Test: 88034-07                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09
Study Type: CHRONIC                                             OZONE/NNK                                         Date: 04/23/97  
Route: RESPIRATORY EXPOSURE WHOLE BODY                                                                            Time: 08:17:56  
                                                                                                                                    
 __________________________________________________________________________________________________________________________________ 
                                           | 6| 6| 7| 6| 6| 7| 4| 5| 4| 7| 5| 5| 4| 6| 4| 6| 6| 6| 5| 6| 5| 5| 6|     |            |
                             DAY ON TEST   | 8| 4| 0| 0| 0| 1| 8| 4| 5| 3| 9| 3| 8| 9| 8| 7| 8| 0| 8| 6| 5| 8| 4|     |            |
                                           | 3| 5| 4| 3| 5| 2| 6| 0| 0| 6| 0| 3| 9| 5| 8| 7| 3| 5| 3| 9| 0| 3| 1|     |      T (*) |
 _____________________________________________________________________________________________________________________|            |
                                           | 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                   | 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8|     |      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|     |      A     |
    1 MG/KG                                | 2| 2| 2| 2| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 4| 4| 4| 4| 4| 4| 4| 4| 4|     |      L     |
    NNK/AIR                                | 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8|     |            |
 __________________________________________________________________________________________________________________________________ 
 GENITAL SYSTEM - cont                     |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Penis                                   |                                                                   +      |   5        |
      Inflammation, Chronic Active         |                                                                          |      2  2.0|
                                            __________________________________________________________________________|____________|
   Preputial Gland                         |                                           +     +  +                     |   9        |
      Inflammation, Chronic Active         |                                           4     2  2                     |      7  2.6|
                                            __________________________________________________________________________|____________|
   Seminal Vesicle                         | +                                                                        |   1        |
                                            __________________________________________________________________________|____________|
   Testes                                  |       +                    +           +     +  +        +               |  13        |
      Atrophy                              |       3                                         4                        |      3  3.3|
 _____________________________________________________________________________________________________________________|            |
 HEMATOPOIETIC SYSTEM                      |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Lymph Node                              | +  +  +  +     +  +        +           +  +  +        +     +            |  26        |
      Pancreatic, Inflammation,            |                                                                          |            |
          Granulomatous                    |                                                                          |      1  2.0|
      Renal, Hemorrhage                    |                                        3                                 |      3  3.0|
      Renal, Infiltration Cellular, Plasma |                                                                          |            |
          Cell                             |                                        3     2                           |      5  2.0|
      Renal, Inflammation, Granulomatous   |                                                                          |      1  2.0|
                                            __________________________________________________________________________|____________|
   Lymph Node, Bronchial                   | +  +  +  M  +  +  +  +  M  +  +  M  +  M  +  M  +  +  +  +  +  M  M      |  28        |
                                            __________________________________________________________________________|____________|
   Lymph Node, Mandibular                  | +     +           +  +                    +                              |  14        |
      Infiltration Cellular, Plasma Cell   |                                                                          |      3  2.7|
      Necrosis                             |                                                                          |      1  4.0|
                                            __________________________________________________________________________|____________|
   Lymph Node, Mesenteric                  | +        +     +     +                    +                 +            |   9        |
                                            __________________________________________________________________________|____________|
   Lymph Node, Mediastinal                 | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  M  +      |  45        |
      Fibrosis                             |                                                                          |      1  3.0|
      Hemorrhage                           |                                                                          |      2  2.5|
      Infiltration Cellular, Plasma Cell   |                                                                          |      1  3.0|
      Necrosis                             |                                                                          |      1  4.0|
                                            __________________________________________________________________________|____________|
   Spleen                                  | +  +  +  +  +  +  +  +     +  +           +  +  +  +  +  +  +            |  39        |
      Accessory Spleen                     | X                                         X                              |      4     |
      Atrophy                              |                                                                          |      1  3.0|
      Fibrosis                             | 2           3                 2              2  3                        |     10  2.4|
      Hematopoietic Cell Proliferation     |                                                                          |      1  2.0|
      Necrosis                             |                                                          3  4            |      3  3.7|
                                            __________________________________________________________________________|____________|
   Thymus                                  |                      +                                                   |   3        |
 _____________________________________________________________________________________________________________________|            |
 INTEGUMENTARY SYSTEM                      |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Mammary Gland                           |    +                                   +                                 |   5        |
      Galactocele                          |                                        4                                 |      4  3.0|
      Hyperplasia                          |    2                                                                     |      1  2.0|
      Inflammation, Chronic                |                                                                          |      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  20                                                               
NTP Experiment-Test: 88034-07                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09
Study Type: CHRONIC                                             OZONE/NNK                                         Date: 04/23/97  
Route: RESPIRATORY EXPOSURE WHOLE BODY                                                                            Time: 08:17:56  
                                                                                                                                    
 __________________________________________________________________________________________________________________________________ 
                                           | 6| 6| 7| 6| 6| 7| 4| 5| 4| 7| 5| 5| 4| 6| 4| 6| 6| 6| 5| 6| 5| 5| 6|     |            |
                             DAY ON TEST   | 8| 4| 0| 0| 0| 1| 8| 4| 5| 3| 9| 3| 8| 9| 8| 7| 8| 0| 8| 6| 5| 8| 4|     |            |
                                           | 3| 5| 4| 3| 5| 2| 6| 0| 0| 6| 0| 3| 9| 5| 8| 7| 3| 5| 3| 9| 0| 3| 1|     |      T (*) |
 _____________________________________________________________________________________________________________________|            |
                                           | 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                   | 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8|     |      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|     |      A     |
    1 MG/KG                                | 2| 2| 2| 2| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 4| 4| 4| 4| 4| 4| 4| 4| 4|     |      L     |
    NNK/AIR                                | 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8|     |            |
 __________________________________________________________________________________________________________________________________ 
 INTEGUMENTARY SYSTEM - cont               |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Skin                                    |    +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  47        |
      Hyperkeratosis                       |                                              3                           |      3  2.7|
      Inflammation, Chronic                |                                                                          |      2  2.5|
      Inflammation, Suppurative            |                                                                          |      1  3.0|
      Ulcer                                |                                                                          |      1  2.0|
      Prepuce, Inflammation, Suppurative   |                                                                          |      1  2.0|
      Subcutaneous Tissue, Skin, Site of   |                                                                          |            |
          Application, Inflammation,       |                                                                          |            |
          Chronic                          |    1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1      |     48  1.1|
 _____________________________________________________________________________________________________________________|            |
 MUSCULOSKELETAL SYSTEM                    |                                                                          |            |
                                           |                                                                          |            |
    None                                   |                                                                          |            |
 _____________________________________________________________________________________________________________________|            |
 NERVOUS SYSTEM                            |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Brain                                   |                                        +                                 |   1        |
      Hemorrhage                           |                                        1                                 |      1  1.0|
 _____________________________________________________________________________________________________________________|            |
 RESPIRATORY SYSTEM                        |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Larynx                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
                                            __________________________________________________________________________|____________|
   Lung                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
      Congestion                           |             1                                                     1      |      3  1.0|
      Fibrosis, Focal                      |                                                    3                     |      1  3.0|
      Hemorrhage                           |                               2     4                 2        2         |      5  2.4|
      Alveolar Epithelium, Hyperplasia,    |                                                                          |            |
           Atypical                        | 2  2  2     2  1     1  2  2  2        2     2  2  3  2  2     3  3      |     39  2.1|
      Alveolus, Infiltration Cellular,     |                                                                          |            |
           Focal, Histiocyte               |                               3                                          |      1  3.0|
      Alveolus, Infiltration Cellular,     |                                                                          |            |
           Histiocyte                      |                         1              2        2                 3      |      8  2.3|
      Serosa, Fibrosis                     |                            2                                             |      1  2.0|
                                            __________________________________________________________________________|____________|
   Nose                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
      Inflammation, Suppurative            | 2                                                                        |      5  2.4|
      Goblet Cell, Lateral Wall,           |                                                                          |            |
          Hyperplasia                      | 1                                                                        |      3  1.3|
      Lateral Wall, Hyperplasia            | 1                                                                        |      5  1.8|
      Nasopharyngeal Duct, Infiltration    |                                                                          |            |
          Cellular, Mixed Cell             |                                                                   2      |      1  2.0|
      Olfactory Epithelium, Degeneration,  |                                                                          |            |
           Hyaline                         | 1  1  1  1  1  2  1  2  1  1  2  1  1  1  1     2  1  3  2  1  2  1      |     45  1.2|
 __________________________________________________________________________________________________________________________________ 
  * : 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  21                                                               
NTP Experiment-Test: 88034-07                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09
Study Type: CHRONIC                                             OZONE/NNK                                         Date: 04/23/97  
Route: RESPIRATORY EXPOSURE WHOLE BODY                                                                            Time: 08:17:56  
                                                                                                                                    
 __________________________________________________________________________________________________________________________________ 
                                           | 6| 6| 7| 6| 6| 7| 4| 5| 4| 7| 5| 5| 4| 6| 4| 6| 6| 6| 5| 6| 5| 5| 6|     |            |
                             DAY ON TEST   | 8| 4| 0| 0| 0| 1| 8| 4| 5| 3| 9| 3| 8| 9| 8| 7| 8| 0| 8| 6| 5| 8| 4|     |            |
                                           | 3| 5| 4| 3| 5| 2| 6| 0| 0| 6| 0| 3| 9| 5| 8| 7| 3| 5| 3| 9| 0| 3| 1|     |      T (*) |
 _____________________________________________________________________________________________________________________|            |
                                           | 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                   | 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8|     |      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|     |      A     |
    1 MG/KG                                | 2| 2| 2| 2| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 4| 4| 4| 4| 4| 4| 4| 4| 4|     |      L     |
    NNK/AIR                                | 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8|     |            |
 __________________________________________________________________________________________________________________________________ 
 RESPIRATORY SYSTEM - cont                 |                                                                          |            |
                                           |                                                                          |            |
      Olfactory Epithelium, Metaplasia     |                                                       2                  |      2  1.5|
                                            __________________________________________________________________________|____________|
   Trachea                                 | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
 _____________________________________________________________________________________________________________________|            |
 SPECIAL SENSES SYSTEM                     |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Eye                                     |                                                                          |   1        |
      Cataract                             |                                                                          |      1  2.0|
 _____________________________________________________________________________________________________________________|            |
 URINARY SYSTEM                            |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Kidney                                  | +  +  +  +  +  +           +           +     +  +           +            |  24        |
      Infarct                              |                                                             3            |      2  3.0|
      Nephropathy                          | 3  3        3  3           3           4     4  3           3            |     22  3.2|
                                            __________________________________________________________________________|____________|
   Ureter                                  |                                                                          |   1        |
                                            __________________________________________________________________________|____________|
   Urinary Bladder                         |                                        +                                 |   1        |
      Hemorrhage                           |                                        3                                 |      1  3.0|
      Inflammation, Suppurative            |                                        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  22                                                               
NTP Experiment-Test: 88034-07                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09
Study Type: CHRONIC                                             OZONE/NNK                                         Date: 04/23/97  
Route: RESPIRATORY EXPOSURE WHOLE BODY                                                                            Time: 08:17:56  
                                                                                                                                    
 _____________________________________________________________________________________________________________________              
                                           | 7| 5| 6| 4| 4| 6| 6| 5| 6| 6| 3| 3| 1| 7| 6| 5| 7| 7| 5| 5| 5| 6| 7| 6| 6|             
                             DAY ON TEST   | 2| 5| 0| 5| 4| 3| 6| 0| 7| 7| 8| 3| 9| 1| 2| 8| 3| 0| 2| 9| 1| 4| 0| 1| 1|             
                                           | 5| 6| 3| 8| 0| 6| 9| 2| 8| 3| 9| 3| 2| 2| 4| 9| 6| 9| 3| 2| 5| 5| 4| 1| 7|             
 _____________________________________________________________________________________________________________________|             
                                           | 0| 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                   | 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8|             
                               ANIMAL ID   | 6| 6| 6| 6| 6| 6| 6| 6| 6| 6| 6| 6| 6| 6| 6| 6| 6| 6| 6| 6| 6| 6| 6| 6| 6|             
    TRIOCT./                               | 0| 0| 0| 0| 0| 0| 0| 0| 0| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 2| 2| 2| 2| 2| 2|             
    OZONE                                  | 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                         |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Intestine Large, Colon                  |                                                                          |             
      Mineralization                       |                                                                          |             
                                            __________________________________________________________________________|             
   Intestine Large, Rectum                 |                                                                          |             
      Mineralization                       |                                                                          |             
                                            __________________________________________________________________________|             
   Intestine Large, Cecum                  |                                                                          |             
                                            __________________________________________________________________________|             
   Liver                                   | +              +        +  +           +  +  +  +  +     +  +  +  +  +  +|             
      Angiectasis                          |                                                                         2|             
      Degeneration, Cystic                 |                            2                       2                     |             
      Hepatodiaphragmatic Nodule           |                                                 X                        |             
      Hyperplasia, Focal                   |                                              3                           |             
      Necrosis, Focal                      |                                                                          |             
      Vacuolization Cytoplasmic            |                            2                                2        2   |             
      Bile Duct, Hyperplasia               |                                                                   3      |             
                                            __________________________________________________________________________|             
   Mesentery                               |       +              +                                   +           +  +|             
      Fat, Necrosis                        |                      3                                   2           3   |             
                                            __________________________________________________________________________|             
   Oral Mucosa                             |                                                       +                  |             
      Pharyngeal, Foreign Body             |                                                       X                  |             
                                            __________________________________________________________________________|             
   Pancreas                                |          +                                                               |             
                                            __________________________________________________________________________|             
   Stomach, Forestomach                    |                                                    +                     |             
      Mineralization                       |                                                    3                     |             
      Ulcer                                |                                                                          |             
                                            __________________________________________________________________________|             
   Stomach, Glandular                      |                                                    +                     |             
      Mineralization                       |                                                    3                     |             
      Necrosis                             |                                                                          |             
 _____________________________________________________________________________________________________________________|             
 CARDIOVASCULAR SYSTEM                     |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Blood Vessel                            |                                                    +                     |             
      Inflammation, Chronic                |                                                    2                     |             
      Mineralization                       |                                                    3                     |             
                                            __________________________________________________________________________|             
   Heart                                   |                                                                          |             
      Cardiomyopathy                       |                                                                          |             
 _____________________________________________________________________________________________________________________|             
 ENDOCRINE SYSTEM                          |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Adrenal Cortex                          |                                                    +           +        +|             
      Angiectasis                          |                                                                         3|             
                                            __________________________________________________________________________|             
   Islets, Pancreatic                      |                                                                   +      |             
                                            __________________________________________________________________________|             
   Parathyroid Gland                       |                                                                          |             
      Hyperplasia                          |                                                                          |             
                                            __________________________________________________________________________|             
   Pituitary Gland                         | +  +  +           +  +  M  +  +                    +        +        +  +|             
                                            __________________________________________________________________________|             
   Thyroid Gland                           | +                                                                        |             
      Follicular Cell, Hyperplasia         | 3                                                                        |             
 _____________________________________________________________________________________________________________________|             
 GENERAL BODY SYSTEM                       |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Peritoneum                              |                +  +     +  +  +        +  +        +     +  +  +  +  +  +|             
 _____________________________________________________________________________________________________________________|             
                                                             Page  23                                                               
NTP Experiment-Test: 88034-07                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09
Study Type: CHRONIC                                             OZONE/NNK                                         Date: 04/23/97  
Route: RESPIRATORY EXPOSURE WHOLE BODY                                                                            Time: 08:17:56  
                                                                                                                                    
 _____________________________________________________________________________________________________________________              
                                           | 7| 5| 6| 4| 4| 6| 6| 5| 6| 6| 3| 3| 1| 7| 6| 5| 7| 7| 5| 5| 5| 6| 7| 6| 6|             
                             DAY ON TEST   | 2| 5| 0| 5| 4| 3| 6| 0| 7| 7| 8| 3| 9| 1| 2| 8| 3| 0| 2| 9| 1| 4| 0| 1| 1|             
                                           | 5| 6| 3| 8| 0| 6| 9| 2| 8| 3| 9| 3| 2| 2| 4| 9| 6| 9| 3| 2| 5| 5| 4| 1| 7|             
 _____________________________________________________________________________________________________________________|             
                                           | 0| 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                   | 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8|             
                               ANIMAL ID   | 6| 6| 6| 6| 6| 6| 6| 6| 6| 6| 6| 6| 6| 6| 6| 6| 6| 6| 6| 6| 6| 6| 6| 6| 6|             
    TRIOCT./                               | 0| 0| 0| 0| 0| 0| 0| 0| 0| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 2| 2| 2| 2| 2| 2|             
    OZONE                                  | 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|             
 _____________________________________________________________________________________________________________________|             
 GENERAL BODY SYSTEM - cont                |                                                                          |             
                                           |                                                                          |             
      Inflammation, Chronic                |                1  1     1  1  1        1  1        1     1  1  1  1  1  1|             
                                            __________________________________________________________________________|             
   Tissue NOS                              |       +     +  +                                +                 +      |             
      Mediastinum, Inflammation, Chronic   |                                                                          |             
          Active, Diffuse                  |                                                                   4      |             
 _____________________________________________________________________________________________________________________|             
 GENITAL SYSTEM                            |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Penis                                   |                                                                         +|             
      Calculus Gross Observation           |                                                                          |             
      Calculus Micro Observation Only      |                                                                          |             
                                            __________________________________________________________________________|             
   Preputial Gland                         |                      +     +                    +           +        +   |             
      Inflammation, Chronic Active         |                            2                    4                    3   |             
                                            __________________________________________________________________________|             
   Prostate                                |                   +                                                      |             
      Inflammation, Suppurative            |                   2                                                      |             
                                            __________________________________________________________________________|             
   Testes                                  | +  +  +           +     +                    +  +  +     +        +     +|             
      Atrophy                              |                   2                                                      |             
      Necrosis                             |       4                                                                  |             
 _____________________________________________________________________________________________________________________|             
 HEMATOPOIETIC SYSTEM                      |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Lymph Node                              |                                        +                 +     +         |             
      Hyperplasia, Lymphoid                |                                                          2               |             
      Pigmentation                         |                                                          3               |             
      Renal, Hemorrhage                    |                                                                          |             
      Renal, Inflammation, Granulomatous   |                                                                          |             
                                            __________________________________________________________________________|             
   Lymph Node, Bronchial                   | M  M  M  +  +  +  +  M  +  +  +  +  M  +  M  +  +  M  +  M  +  M  M  M  +|             
      Hemorrhage                           |             2                                                            |             
      Hyperplasia, Lymphoid                |                                                             2            |             
                                            __________________________________________________________________________|             
   Lymph Node, Mandibular                  |                                                             +            |             
      Infiltration Cellular, Plasma Cell   |                                                             2            |             
                                            __________________________________________________________________________|             
   Lymph Node, Mesenteric                  |                                                                          |             
      Hyperplasia, Lymphoid                |                                                                          |             
                                            __________________________________________________________________________|             
   Lymph Node, Mediastinal                 | +  I  +  +  +  +  +  +  +  +  M  +  +  +  +  M  +  M  +  +  +  +  +  +  +|             
      Hemorrhage                           |       3     3                                                           3|             
      Infiltration Cellular, Plasma Cell   |       2                                                     1            |             
      Inflammation, Chronic Active         |                                                                   3      |             
                                            __________________________________________________________________________|             
   Spleen                                  | +        +     +  +  +  +  +  +        +  +     +  +     +     +  +     +|             
      Congestion                           |                            2                                             |             
      Fibrosis                             |                               2                    1                     |             
      Hematopoietic Cell Proliferation     |                                                                         3|             
      Necrosis                             |                                                                   4      |             
                                            __________________________________________________________________________|             
   Thymus                                  |          +                                                               |             
 _____________________________________________________________________________________________________________________|             
 INTEGUMENTARY SYSTEM                      |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Mammary Gland                           |                      +                                                   |             
      Galactocele                          |                      3                                                   |             
 _____________________________________________________________________________________________________________________|             
                                                             Page  24                                                               
NTP Experiment-Test: 88034-07                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09
Study Type: CHRONIC                                             OZONE/NNK                                         Date: 04/23/97  
Route: RESPIRATORY EXPOSURE WHOLE BODY                                                                            Time: 08:17:56  
                                                                                                                                    
 _____________________________________________________________________________________________________________________              
                                           | 7| 5| 6| 4| 4| 6| 6| 5| 6| 6| 3| 3| 1| 7| 6| 5| 7| 7| 5| 5| 5| 6| 7| 6| 6|             
                             DAY ON TEST   | 2| 5| 0| 5| 4| 3| 6| 0| 7| 7| 8| 3| 9| 1| 2| 8| 3| 0| 2| 9| 1| 4| 0| 1| 1|             
                                           | 5| 6| 3| 8| 0| 6| 9| 2| 8| 3| 9| 3| 2| 2| 4| 9| 6| 9| 3| 2| 5| 5| 4| 1| 7|             
 _____________________________________________________________________________________________________________________|             
                                           | 0| 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                   | 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8|             
                               ANIMAL ID   | 6| 6| 6| 6| 6| 6| 6| 6| 6| 6| 6| 6| 6| 6| 6| 6| 6| 6| 6| 6| 6| 6| 6| 6| 6|             
    TRIOCT./                               | 0| 0| 0| 0| 0| 0| 0| 0| 0| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 2| 2| 2| 2| 2| 2|             
    OZONE                                  | 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               |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Skin                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Inflammation, Suppurative            |                                                                          |             
      Prepuce, Inflammation, Suppurative   |                                                                          |             
      Subcutaneous Tissue, Skin, Site of   |                                                                          |             
          Application, Inflammation,       |                                                                          |             
          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  1|             
 _____________________________________________________________________________________________________________________|             
 MUSCULOSKELETAL SYSTEM                    |                                                                          |             
                                           |                                                                          |             
    None                                   |                                                                          |             
 _____________________________________________________________________________________________________________________|             
 NERVOUS SYSTEM                            |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Brain                                   |                                                                          |             
 _____________________________________________________________________________________________________________________|             
 RESPIRATORY SYSTEM                        |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Larynx                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Foreign Body                         |    X                                         X                           |             
      Inflammation, Suppurative            |    2                                                                     |             
      Mineralization                       |                                                                          |             
                                            __________________________________________________________________________|             
   Lung                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Edema                                |                                                                          |             
      Hemorrhage                           |                                                             1            |             
      Mineralization                       |                                                    3                     |             
      Alveolar Epithelium, Hyperplasia     |                                        2                                 |             
      Alveolar Epithelium, Metaplasia      |    1  1  1        1  1  1  1  1  1  1  1  1  1  1        1  1        1  1|             
      Alveolus, Infiltration Cellular,     |                                                                          |             
           Histiocyte                      |                         1     1        2  1                              |             
      Bronchus, Inflammation, Suppurative  |                                                                      3   |             
      Interstitium, Fibrosis               |    1  1  1        1  1  1  1  1  1  1  1  1  1  1        1  1        1  1|             
      Interstitium, Inflammation, Chronic, |                                                                          |             
           Diffuse                         |                                                    1                     |             
      Serosa, Inflammation, Chronic Active |                                                                   3      |             
                                            __________________________________________________________________________|             
   Nose                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Inflammation, Suppurative            |                   2                                               2      |             
      Goblet Cell, Lateral Wall,           |                                                                          |             
          Hyperplasia                      | 1              1     1  1  1  1  1  1  1  2  1  1  1  1  1  1  1     1   |             
      Lateral Wall, Hyperplasia            | 1     1  1     1  1  1  2  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1|             
      Olfactory Epithelium, Degeneration,  |                                                                          |             
           Hyaline                         | 2  2  2  2  2  2  2  3  2  2  2  2     2  2  2  2  3  2  2  2  3  2  2  2|             
      Olfactory Epithelium, Metaplasia     |                                                                          |             
      Turbinate, Necrosis                  |                                                                          |             
                                            __________________________________________________________________________|             
   Pleura                                  |             +                                                            |             
                                            __________________________________________________________________________|             
   Trachea                                 | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
 _____________________________________________________________________________________________________________________|             
 SPECIAL SENSES SYSTEM                     |                                                                          |             
                                           |                                                                          |             
 _____________________________________________________________________________________________________________________|             
                                                             Page  25                                                               
NTP Experiment-Test: 88034-07                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09
Study Type: CHRONIC                                             OZONE/NNK                                         Date: 04/23/97  
Route: RESPIRATORY EXPOSURE WHOLE BODY                                                                            Time: 08:17:56  
                                                                                                                                    
 _____________________________________________________________________________________________________________________              
                                           | 7| 5| 6| 4| 4| 6| 6| 5| 6| 6| 3| 3| 1| 7| 6| 5| 7| 7| 5| 5| 5| 6| 7| 6| 6|             
                             DAY ON TEST   | 2| 5| 0| 5| 4| 3| 6| 0| 7| 7| 8| 3| 9| 1| 2| 8| 3| 0| 2| 9| 1| 4| 0| 1| 1|             
                                           | 5| 6| 3| 8| 0| 6| 9| 2| 8| 3| 9| 3| 2| 2| 4| 9| 6| 9| 3| 2| 5| 5| 4| 1| 7|             
 _____________________________________________________________________________________________________________________|             
                                           | 0| 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                   | 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8|             
                               ANIMAL ID   | 6| 6| 6| 6| 6| 6| 6| 6| 6| 6| 6| 6| 6| 6| 6| 6| 6| 6| 6| 6| 6| 6| 6| 6| 6|             
    TRIOCT./                               | 0| 0| 0| 0| 0| 0| 0| 0| 0| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 2| 2| 2| 2| 2| 2|             
    OZONE                                  | 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5|             
 _____________________________________________________________________________________________________________________|             
 SPECIAL SENSES SYSTEM - cont              |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Eye                                     |                                                                          |             
      Cataract                             |                                                                          |             
      Ciliary Body, Retina, Degeneration   |                                                                          |             
 _____________________________________________________________________________________________________________________|             
 URINARY SYSTEM                            |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Kidney                                  |          +              +                          +     +  +     +  +   |             
      Cyst                                 |                                                                          |             
      Nephropathy                          |                         3                          4     3  3     3  3   |             
                                            __________________________________________________________________________|             
   Urinary Bladder                         |                                                                          |             
      Calculus Gross Observation           |                                                                          |             
      Calculus Micro Observation Only      |                                                                          |             
      Hemorrhage                           |                                                                          |             
 _____________________________________________________________________________________________________________________|             
                                                             Page  26                                                               
NTP Experiment-Test: 88034-07                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09
Study Type: CHRONIC                                             OZONE/NNK                                         Date: 04/23/97  
Route: RESPIRATORY EXPOSURE WHOLE BODY                                                                            Time: 08:17:56  
                                                                                                                                    
 __________________________________________________________________________________________________________________________________ 
                                           | 7| 5| 6| 6| 6| 7| 7| 5| 5| 6| 6| 6| 6| 2| 6| 6| 7| 5| 7| 5| 6| 5| 4|     |            |
                             DAY ON TEST   | 3| 9| 0| 3| 9| 3| 0| 8| 5| 6| 5| 3| 3| 5| 3| 1| 2| 3| 1| 2| 3| 6| 8|     |            |
                                           | 6| 0| 5| 5| 4| 6| 5| 0| 0| 1| 9| 4| 4| 3| 1| 4| 2| 7| 8| 9| 5| 0| 7|     |      T (*) |
 _____________________________________________________________________________________________________________________|            |
                                           | 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                   | 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8|     |      T     |
                               ANIMAL ID   | 6| 6| 6| 6| 6| 6| 6| 6| 6| 6| 6| 6| 6| 6| 6| 6| 6| 6| 6| 6| 6| 6| 6|     |      A     |
    TRIOCT./                               | 2| 2| 2| 2| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 4| 4| 4| 4| 4| 4| 4| 4| 4|     |      L     |
    OZONE                                  | 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8|     |            |
 __________________________________________________________________________________________________________________________________ 
 ALIMENTARY SYSTEM                         |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Intestine Large, Colon                  |                                                 +                        |   1        |
      Mineralization                       |                                                 3                        |      1  3.0|
                                            __________________________________________________________________________|____________|
   Intestine Large, Rectum                 |                                                 +                        |   1        |
      Mineralization                       |                                                 2                        |      1  2.0|
                                            __________________________________________________________________________|____________|
   Intestine Large, Cecum                  |                      A                                                   |            |
                                            __________________________________________________________________________|____________|
   Liver                                   |    +  +           +  +  +  +     +  +        +  +           +  +  +      |  28        |
      Angiectasis                          |                      2  1                                                |      3  1.7|
      Degeneration, Cystic                 |                   2                             1                        |      4  1.8|
      Hepatodiaphragmatic Nodule           |                                                                          |      1     |
      Hyperplasia, Focal                   |                                                                          |      1  3.0|
      Necrosis, Focal                      |                            1                                             |      1  1.0|
      Vacuolization Cytoplasmic            |    2                                                                     |      4  2.0|
      Bile Duct, Hyperplasia               |                                                                          |      1  3.0|
                                            __________________________________________________________________________|____________|
   Mesentery                               |                                     +           +              +         |   8        |
      Fat, Necrosis                        |                                     2           3                        |      5  2.6|
                                            __________________________________________________________________________|____________|
   Oral Mucosa                             |                                                                          |   1        |
      Pharyngeal, Foreign Body             |                                                                          |      1     |
                                            __________________________________________________________________________|____________|
   Pancreas                                |                                                                          |   1        |
                                            __________________________________________________________________________|____________|
   Stomach, Forestomach                    |                                                                +         |   2        |
      Mineralization                       |                                                                          |      1  3.0|
      Ulcer                                |                                                                3         |      1  3.0|
                                            __________________________________________________________________________|____________|
   Stomach, Glandular                      |                                                 +              +         |   3        |
      Mineralization                       |                                                 3                        |      2  3.0|
      Necrosis                             |                                                                2         |      1  2.0|
 _____________________________________________________________________________________________________________________|            |
 CARDIOVASCULAR SYSTEM                     |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Blood Vessel                            |                                                                          |   1        |
      Inflammation, Chronic                |                                                                          |      1  2.0|
      Mineralization                       |                                                                          |      1  3.0|
                                            __________________________________________________________________________|____________|
   Heart                                   |                                                             +            |   1        |
      Cardiomyopathy                       |                                                             2            |      1  2.0|
 _____________________________________________________________________________________________________________________|            |
 ENDOCRINE SYSTEM                          |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Adrenal Cortex                          |                                                                          |   3        |
      Angiectasis                          |                                                                          |      1  3.0|
                                            __________________________________________________________________________|____________|
   Islets, Pancreatic                      |                                                                          |   1        |
                                            __________________________________________________________________________|____________|
   Parathyroid Gland                       |                                                 +                        |   1        |
      Hyperplasia                          |                                                 4                        |      1  4.0|
                                            __________________________________________________________________________|____________|
   Pituitary Gland                         |    +  +  +  +  +  +     +  +  +  +  +  +  +     +  +  +     +  +         |  29        |
 __________________________________________________________________________________________________________________________________ 
  * : 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  27                                                               
NTP Experiment-Test: 88034-07                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09
Study Type: CHRONIC                                             OZONE/NNK                                         Date: 04/23/97  
Route: RESPIRATORY EXPOSURE WHOLE BODY                                                                            Time: 08:17:56  
                                                                                                                                    
 __________________________________________________________________________________________________________________________________ 
                                           | 7| 5| 6| 6| 6| 7| 7| 5| 5| 6| 6| 6| 6| 2| 6| 6| 7| 5| 7| 5| 6| 5| 4|     |            |
                             DAY ON TEST   | 3| 9| 0| 3| 9| 3| 0| 8| 5| 6| 5| 3| 3| 5| 3| 1| 2| 3| 1| 2| 3| 6| 8|     |            |
                                           | 6| 0| 5| 5| 4| 6| 5| 0| 0| 1| 9| 4| 4| 3| 1| 4| 2| 7| 8| 9| 5| 0| 7|     |      T (*) |
 _____________________________________________________________________________________________________________________|            |
                                           | 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                   | 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8|     |      T     |
                               ANIMAL ID   | 6| 6| 6| 6| 6| 6| 6| 6| 6| 6| 6| 6| 6| 6| 6| 6| 6| 6| 6| 6| 6| 6| 6|     |      A     |
    TRIOCT./                               | 2| 2| 2| 2| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 4| 4| 4| 4| 4| 4| 4| 4| 4|     |      L     |
    OZONE                                  | 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8|     |            |
 __________________________________________________________________________________________________________________________________ 
 ENDOCRINE SYSTEM - cont                   |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Thyroid Gland                           |                                                                          |   1        |
      Follicular Cell, Hyperplasia         |                                                                          |      1  3.0|
 _____________________________________________________________________________________________________________________|            |
 GENERAL BODY SYSTEM                       |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Peritoneum                              |    +  +  +  +  +  +  +  +  +     +  +     +  +           +  +  +         |  30        |
      Inflammation, Chronic                |    1  1  1  1  1  1  1  1  1     1  1     1  1           1  1  1         |     30  1.0|
                                            __________________________________________________________________________|____________|
   Tissue NOS                              |                                                                          |   5        |
      Mediastinum, Inflammation, Chronic   |                                                                          |            |
          Active, Diffuse                  |                                                                          |      1  4.0|
 _____________________________________________________________________________________________________________________|            |
 GENITAL SYSTEM                            |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Penis                                   |                                                    +        +            |   3        |
      Calculus Gross Observation           |                                                    X                     |      1     |
      Calculus Micro Observation Only      |                                                    X                     |      1     |
                                            __________________________________________________________________________|____________|
   Preputial Gland                         |             +              +                                      +      |   8        |
      Inflammation, Chronic Active         |             2              3                                             |      5  2.8|
                                            __________________________________________________________________________|____________|
   Prostate                                |                                                                          |   1        |
      Inflammation, Suppurative            |                                                                          |      1  2.0|
                                            __________________________________________________________________________|____________|
   Testes                                  | +     +        +  +  +     +     +        +  +  +        +  +  +         |  24        |
      Atrophy                              |                                                                          |      1  2.0|
      Necrosis                             |                                                                          |      1  4.0|
 _____________________________________________________________________________________________________________________|            |
 HEMATOPOIETIC SYSTEM                      |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Lymph Node                              |                      +  +        +  +     +                    +  +      |  10        |
      Hyperplasia, Lymphoid                |                                                                          |      1  2.0|
      Pigmentation                         |                                                                          |      1  3.0|
      Renal, Hemorrhage                    |                                           2                              |      1  2.0|
      Renal, Inflammation, Granulomatous   |                         2                                                |      1  2.0|
                                            __________________________________________________________________________|____________|
   Lymph Node, Bronchial                   | M  M  M  +  +  M  M  M  M  +  +  +  M  +  M  M  M  M  M  +  M  +  +      |  23        |
      Hemorrhage                           |                                                                          |      1  2.0|
      Hyperplasia, Lymphoid                |                                                                          |      1  2.0|
                                            __________________________________________________________________________|____________|
   Lymph Node, Mandibular                  |    +                 +  +        +                 +           +         |   7        |
      Infiltration Cellular, Plasma Cell   |    2                    2                          2           2         |      5  2.0|
                                            __________________________________________________________________________|____________|
   Lymph Node, Mesenteric                  |                                  +  +                             +      |   3        |
      Hyperplasia, Lymphoid                |                                     3                                    |      1  3.0|
                                            __________________________________________________________________________|____________|
   Lymph Node, Mediastinal                 | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  M  +  +  +  +  +  +  +      |  43        |
      Hemorrhage                           |                                                                          |      3  3.0|
      Infiltration Cellular, Plasma Cell   |                                                                          |      2  1.5|
      Inflammation, Chronic Active         |                                                                          |      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  28                                                               
NTP Experiment-Test: 88034-07                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09
Study Type: CHRONIC                                             OZONE/NNK                                         Date: 04/23/97  
Route: RESPIRATORY EXPOSURE WHOLE BODY                                                                            Time: 08:17:56  
                                                                                                                                    
 __________________________________________________________________________________________________________________________________ 
                                           | 7| 5| 6| 6| 6| 7| 7| 5| 5| 6| 6| 6| 6| 2| 6| 6| 7| 5| 7| 5| 6| 5| 4|     |            |
                             DAY ON TEST   | 3| 9| 0| 3| 9| 3| 0| 8| 5| 6| 5| 3| 3| 5| 3| 1| 2| 3| 1| 2| 3| 6| 8|     |            |
                                           | 6| 0| 5| 5| 4| 6| 5| 0| 0| 1| 9| 4| 4| 3| 1| 4| 2| 7| 8| 9| 5| 0| 7|     |      T (*) |
 _____________________________________________________________________________________________________________________|            |
                                           | 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                   | 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8|     |      T     |
                               ANIMAL ID   | 6| 6| 6| 6| 6| 6| 6| 6| 6| 6| 6| 6| 6| 6| 6| 6| 6| 6| 6| 6| 6| 6| 6|     |      A     |
    TRIOCT./                               | 2| 2| 2| 2| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 4| 4| 4| 4| 4| 4| 4| 4| 4|     |      L     |
    OZONE                                  | 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8|     |            |
 __________________________________________________________________________________________________________________________________ 
 HEMATOPOIETIC SYSTEM - cont               |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Spleen                                  | +     +  +  +  +  +  +     +  +  +  +     +     +     +     +  +  +      |  33        |
      Congestion                           | 2                                                                        |      2  2.0|
      Fibrosis                             | 3     3  3                                2           2                  |      7  2.3|
      Hematopoietic Cell Proliferation     |                                                                          |      1  3.0|
      Necrosis                             |                                                                          |      1  4.0|
                                            __________________________________________________________________________|____________|
   Thymus                                  |                                                                          |   1        |
 _____________________________________________________________________________________________________________________|            |
 INTEGUMENTARY SYSTEM                      |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Mammary Gland                           |                                     +                                    |   2        |
      Galactocele                          |                                     3                                    |      2  3.0|
                                            __________________________________________________________________________|____________|
   Skin                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
      Inflammation, Suppurative            |    3                                                                     |      1  3.0|
      Prepuce, Inflammation, Suppurative   |                                     2           3           3            |      3  2.7|
      Subcutaneous Tissue, Skin, Site of   |                                                                          |            |
          Application, Inflammation,       |                                                                          |            |
          Chronic                          | 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|
 _____________________________________________________________________________________________________________________|            |
 MUSCULOSKELETAL SYSTEM                    |                                                                          |            |
                                           |                                                                          |            |
    None                                   |                                                                          |            |
 _____________________________________________________________________________________________________________________|            |
 NERVOUS SYSTEM                            |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Brain                                   |                                        +                       +         |   2        |
 _____________________________________________________________________________________________________________________|            |
 RESPIRATORY SYSTEM                        |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Larynx                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
      Foreign Body                         |                                                                          |      2     |
      Inflammation, Suppurative            |    2                                1                                    |      3  1.7|
      Mineralization                       |                                                 3                        |      1  3.0|
                                            __________________________________________________________________________|____________|
   Lung                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
      Edema                                |                                                 3                        |      1  3.0|
      Hemorrhage                           |                            2                                             |      2  1.5|
      Mineralization                       |                                                 3                        |      2  3.0|
      Alveolar Epithelium, Hyperplasia     |                                                                          |      1  2.0|
      Alveolar Epithelium, Metaplasia      | 1     1  1     1  1     1        1  1     1  1  1  1  1  1  1  1  1      |     35  1.0|
      Alveolus, Infiltration Cellular,     |                                                                          |            |
           Histiocyte                      |                         1                          1     1               |      7  1.1|
      Bronchus, Inflammation, Suppurative  |                                                                          |      1  3.0|
      Interstitium, Fibrosis               | 1     1  1     1  1     1        1  1     1  1     1  1  1  1  3  1      |     34  1.1|
      Interstitium, Inflammation, Chronic, |                                                                          |            |
 __________________________________________________________________________________________________________________________________ 
  * : 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  29                                                               
NTP Experiment-Test: 88034-07                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09
Study Type: CHRONIC                                             OZONE/NNK                                         Date: 04/23/97  
Route: RESPIRATORY EXPOSURE WHOLE BODY                                                                            Time: 08:17:56  
                                                                                                                                    
 __________________________________________________________________________________________________________________________________ 
                                           | 7| 5| 6| 6| 6| 7| 7| 5| 5| 6| 6| 6| 6| 2| 6| 6| 7| 5| 7| 5| 6| 5| 4|     |            |
                             DAY ON TEST   | 3| 9| 0| 3| 9| 3| 0| 8| 5| 6| 5| 3| 3| 5| 3| 1| 2| 3| 1| 2| 3| 6| 8|     |            |
                                           | 6| 0| 5| 5| 4| 6| 5| 0| 0| 1| 9| 4| 4| 3| 1| 4| 2| 7| 8| 9| 5| 0| 7|     |      T (*) |
 _____________________________________________________________________________________________________________________|            |
                                           | 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                   | 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8|     |      T     |
                               ANIMAL ID   | 6| 6| 6| 6| 6| 6| 6| 6| 6| 6| 6| 6| 6| 6| 6| 6| 6| 6| 6| 6| 6| 6| 6|     |      A     |
    TRIOCT./                               | 2| 2| 2| 2| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 4| 4| 4| 4| 4| 4| 4| 4| 4|     |      L     |
    OZONE                                  | 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8|     |            |
 __________________________________________________________________________________________________________________________________ 
 RESPIRATORY SYSTEM - cont                 |                                                                          |            |
                                           |                                                                          |            |
           Diffuse                         |                                                 3                        |      2  2.0|
      Serosa, Inflammation, Chronic Active |                                                                          |      1  3.0|
                                            __________________________________________________________________________|____________|
   Nose                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
      Inflammation, Suppurative            |                                     2                                    |      3  2.0|
      Goblet Cell, Lateral Wall,           |                                                                          |            |
          Hyperplasia                      | 1  1  1  1  1  1  1  1  1  1  1     1  1     1  1  1     1  1  1  1      |     38  1.0|
      Lateral Wall, Hyperplasia            | 1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1      |     46  1.0|
      Olfactory Epithelium, Degeneration,  |                                                                          |            |
           Hyaline                         | 3  2  2  2  2  2  2  3  2  2  1  3  2  1  2  2  2  2  2  2  2  2  2      |     47  2.1|
      Olfactory Epithelium, Metaplasia     |                      1                                                   |      1  1.0|
      Turbinate, Necrosis                  |                                     3                                    |      1  3.0|
                                            __________________________________________________________________________|____________|
   Pleura                                  |                                                 +                        |   2        |
                                            __________________________________________________________________________|____________|
   Trachea                                 | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  A  +  +  +  +  +  +      |  47        |
 _____________________________________________________________________________________________________________________|            |
 SPECIAL SENSES SYSTEM                     |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Eye                                     |       +                                                                  |   1        |
      Cataract                             |       4                                                                  |      1  4.0|
      Ciliary Body, Retina, Degeneration   |       4                                                                  |      1  4.0|
 _____________________________________________________________________________________________________________________|            |
 URINARY SYSTEM                            |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Kidney                                  | +        +  +  +  +                       +     +     +                  |  15        |
      Cyst                                 |                2                                2                        |      2  2.0|
      Nephropathy                          | 3        4  3  4  4                       4     4     4                  |     14  3.5|
                                            __________________________________________________________________________|____________|
   Urinary Bladder                         |                      +                             +                     |   2        |
      Calculus Gross Observation           |                                                    X                     |      1     |
      Calculus Micro Observation Only      |                                                    X                     |      1     |
      Hemorrhage                           |                      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  30                                                               
NTP Experiment-Test: 88034-07                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09
Study Type: CHRONIC                                             OZONE/NNK                                         Date: 04/23/97  
Route: RESPIRATORY EXPOSURE WHOLE BODY                                                                            Time: 08:17:56  
                                                                                                                                    
 _____________________________________________________________________________________________________________________              
                                           | 7| 6| 6| 5| 7| 6| 4| 6| 6| 6| 5| 5| 2| 7| 6| 6| 6| 5| 5| 5| 4| 6| 5| 7| 6|             
                             DAY ON TEST   | 3| 0| 7| 4| 3| 9| 6| 7| 9| 6| 8| 6| 3| 1| 0| 6| 8| 6| 5| 6| 4| 8| 5| 1| 6|             
                                           | 6| 4| 3| 9| 6| 7| 0| 1| 8| 9| 3| 9| 4| 0| 5| 2| 3| 7| 0| 5| 4| 0| 2| 4| 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 MALE                   | 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8|             
                               ANIMAL ID   | 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8|             
    .1M/KNNK                               | 0| 0| 0| 0| 0| 0| 0| 0| 0| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 2| 2| 2| 2| 2| 2|             
    /OZONE                                 | 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                         |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Intestine Large, Cecum                  |                                                             +            |             
                                            __________________________________________________________________________|             
   Intestine Small, Ileum                  |                                                       +                  |             
      Peyer's Patch, Hyperplasia, Lymphoid |                                                       2                  |             
                                            __________________________________________________________________________|             
   Liver                                   | +  +  +  +  +  +  +     +  +  +  +     +  +  +     +  +  +  +     +     +|             
      Angiectasis                          |                                              2                           |             
      Degeneration, Cystic                 |             2              2                                             |             
      Hepatodiaphragmatic Nodule           |                                                                         X|             
      Inflammation                         |                                                                          |             
      Vacuolization Cytoplasmic            | 2                          3                                             |             
                                            __________________________________________________________________________|             
   Mesentery                               |       +  +                    +                       +     +            |             
      Fat, Necrosis                        |       1                       3                             3            |             
                                            __________________________________________________________________________|             
   Stomach, Forestomach                    |                      +                                                   |             
      Inflammation, Chronic Active         |                      3                                                   |             
                                            __________________________________________________________________________|             
   Stomach, Glandular                      |                                                    +                     |             
      Inflammation, Chronic Active         |                                                    1                     |             
                                            __________________________________________________________________________|             
   Tooth                                   |                                                       +                  |             
      Developmental Malformation           |                                                       X                  |             
 _____________________________________________________________________________________________________________________|             
 CARDIOVASCULAR SYSTEM                     |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Heart                                   |          +                                                               |             
      Pericardium, Fibrosis                |                                                                          |             
 _____________________________________________________________________________________________________________________|             
 ENDOCRINE SYSTEM                          |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Adrenal Cortex                          |                               +                                          |             
                                            __________________________________________________________________________|             
   Parathyroid Gland                       |                            +                                             |             
      Hyperplasia                          |                            4                                             |             
                                            __________________________________________________________________________|             
   Pituitary Gland                         |             +     +  +  +  +           +  +  +  +     +        +     +   |             
 _____________________________________________________________________________________________________________________|             
 GENERAL BODY SYSTEM                       |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Peritoneum                              | +  +  +  +     +     +     +     +     +  +           +     +  +  +     +|             
      Inflammation, Chronic                | 1  1  1  1     1     1     1     1     1  1           1     1  1  1     1|             
 _____________________________________________________________________________________________________________________|             
 GENITAL SYSTEM                            |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Epididymis                              |                                                                          |             
                                            __________________________________________________________________________|             
   Penis                                   |                                  +                                       |             
      Calculus Micro Observation Only      |                                  X                                       |             
                                            __________________________________________________________________________|             
   Preputial Gland                         |                                                    +                     |             
      Inflammation, Chronic Active         |                                                    2                     |             
                                            __________________________________________________________________________|             
   Prostate                                |                         +                                                |             
      Inflammation, Suppurative            |                         3                                                |             
                                            __________________________________________________________________________|             
   Testes                                  | +  +  +        +     +  +  +     +        +  +                    +     +|             
      Atrophy                              |                                           3  3                           |             
 _____________________________________________________________________________________________________________________|             
 HEMATOPOIETIC SYSTEM                      |                                                                          |             
                                           |                                                                          |             
 _____________________________________________________________________________________________________________________|             
                                                             Page  31                                                               
NTP Experiment-Test: 88034-07                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09
Study Type: CHRONIC                                             OZONE/NNK                                         Date: 04/23/97  
Route: RESPIRATORY EXPOSURE WHOLE BODY                                                                            Time: 08:17:56  
                                                                                                                                    
 _____________________________________________________________________________________________________________________              
                                           | 7| 6| 6| 5| 7| 6| 4| 6| 6| 6| 5| 5| 2| 7| 6| 6| 6| 5| 5| 5| 4| 6| 5| 7| 6|             
                             DAY ON TEST   | 3| 0| 7| 4| 3| 9| 6| 7| 9| 6| 8| 6| 3| 1| 0| 6| 8| 6| 5| 6| 4| 8| 5| 1| 6|             
                                           | 6| 4| 3| 9| 6| 7| 0| 1| 8| 9| 3| 9| 4| 0| 5| 2| 3| 7| 0| 5| 4| 0| 2| 4| 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 MALE                   | 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8|             
                               ANIMAL ID   | 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8|             
    .1M/KNNK                               | 0| 0| 0| 0| 0| 0| 0| 0| 0| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 2| 2| 2| 2| 2| 2|             
    /OZONE                                 | 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5|             
 _____________________________________________________________________________________________________________________|             
 HEMATOPOIETIC SYSTEM - cont               |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Bone Marrow                             |                         +                                                |             
                                            __________________________________________________________________________|             
   Lymph Node                              |    +     +        +     +  +     +                    +     +            |             
      Pancreatic, Hyperplasia, Lymphoid    |                                                                          |             
      Renal, Hemorrhage                    |                                                                          |             
      Renal, Hyperplasia, Lymphoid         |    2                                                                     |             
      Renal, Infiltration Cellular, Plasma |                                                                          |             
          Cell                             |                            2                                             |             
                                            __________________________________________________________________________|             
   Lymph Node, Bronchial                   | +  M  +  +  M  M  +  +  +  M  M  +  M  M  +  M  +  M  +  M  +  +  +  +  M|             
      Hemorrhage                           |                                                                          |             
                                            __________________________________________________________________________|             
   Lymph Node, Mandibular                  |          +        +              +                    +     +        +   |             
      Infiltration Cellular, Plasma Cell   |                                                                          |             
                                            __________________________________________________________________________|             
   Lymph Node, Mesenteric                  |       +  +        +     +     +  +        +        +        +        +   |             
      Inflammation, Granulomatous          |          3                                                               |             
                                            __________________________________________________________________________|             
   Lymph Node, Mediastinal                 | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Hemorrhage                           |                                                          2               |             
                                            __________________________________________________________________________|             
   Spleen                                  | +  +  +  +  +  +  +  +  +     +  +     +  +        +  +     +  +  +  +  +|             
      Accessory Spleen                     |                                                                          |             
      Congestion                           | 2                                                                        |             
      Fibrosis                             | 3           2                                                  3         |             
                                            __________________________________________________________________________|             
   Thymus                                  |          +        +           +                                          |             
 _____________________________________________________________________________________________________________________|             
 INTEGUMENTARY SYSTEM                      |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Skin                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Hyperkeratosis                       |          3                                                               |             
      Hyperplasia                          |                                                                          |             
      Inflammation, Chronic                | 3                                                                        |             
      Dermis, Cyst                         |                                              3                           |             
      Prepuce, Inflammation, Suppurative   |                                           2                       3      |             
      Sebaceous Gland, Hyperplasia         |                                                                          |             
      Subcutaneous Tissue, Skin, Site of   |                                                                          |             
          Application, Inflammation,       |                                                                          |             
          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  1|             
 _____________________________________________________________________________________________________________________|             
 MUSCULOSKELETAL SYSTEM                    |                                                                          |             
                                           |                                                                          |             
    None                                   |                                                                          |             
 _____________________________________________________________________________________________________________________|             
 NERVOUS SYSTEM                            |                                                                          |             
                                           |                                                                          |             
    None                                   |                                                                          |             
 _____________________________________________________________________________________________________________________|             
 RESPIRATORY SYSTEM                        |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Larynx                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Inflammation, Suppurative            |             1                                                            |             
                                            __________________________________________________________________________|             
   Lung                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Congestion                           |                                                          2               |             
 _____________________________________________________________________________________________________________________|             
                                                             Page  32                                                               
NTP Experiment-Test: 88034-07                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09
Study Type: CHRONIC                                             OZONE/NNK                                         Date: 04/23/97  
Route: RESPIRATORY EXPOSURE WHOLE BODY                                                                            Time: 08:17:56  
                                                                                                                                    
 _____________________________________________________________________________________________________________________              
                                           | 7| 6| 6| 5| 7| 6| 4| 6| 6| 6| 5| 5| 2| 7| 6| 6| 6| 5| 5| 5| 4| 6| 5| 7| 6|             
                             DAY ON TEST   | 3| 0| 7| 4| 3| 9| 6| 7| 9| 6| 8| 6| 3| 1| 0| 6| 8| 6| 5| 6| 4| 8| 5| 1| 6|             
                                           | 6| 4| 3| 9| 6| 7| 0| 1| 8| 9| 3| 9| 4| 0| 5| 2| 3| 7| 0| 5| 4| 0| 2| 4| 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 MALE                   | 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8|             
                               ANIMAL ID   | 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8|             
    .1M/KNNK                               | 0| 0| 0| 0| 0| 0| 0| 0| 0| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 2| 2| 2| 2| 2| 2|             
    /OZONE                                 | 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                 |                                                                          |             
                                           |                                                                          |             
      Edema                                |                                                                          |             
      Hemorrhage                           |                                                                          |             
      Alveolar Epithelium, Hyperplasia,    |                                                                          |             
           Atypical                        |       2     2  1        2  1           2  2     1                        |             
      Alveolar Epithelium, Metaplasia      | 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|             
      Alveolus, Infiltration Cellular,     |                                                                          |             
           Histiocyte                      |                1  1                       2                       1      |             
      Interstitium, Fibrosis               | 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|             
                                            __________________________________________________________________________|             
   Nose                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Inflammation, Suppurative            | 2                       2                                                |             
      Thrombosis                           |          4                                                               |             
      Goblet Cell, Lateral Wall,           |                                                                          |             
          Hyperplasia                      | 1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  2  1     1  1  1  1  1  1|             
      Lateral Wall, Hyperplasia            | 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|             
      Olfactory Epithelium, Degeneration,  |                                                                          |             
           Hyaline                         | 2  2  2  2  2  2  2  2  2  2  3  2  1  2  2  2  3  2  1  2  2  1  2  2  1|             
      Olfactory Epithelium, Metaplasia     |                                                                          |             
      Turbinate, Necrosis                  |                                                                          |             
                                            __________________________________________________________________________|             
   Trachea                                 | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
 _____________________________________________________________________________________________________________________|             
 SPECIAL SENSES SYSTEM                     |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Zymbal's Gland                          |                                                                          |             
 _____________________________________________________________________________________________________________________|             
 URINARY SYSTEM                            |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Kidney                                  |          +  +           +  +           +     +  +           +            |             
      Infarct                              |          2                                                               |             
      Nephropathy                          |          2  3           3  4           3     4  4                        |             
      Pigmentation, Hemosiderin            |                                                                          |             
                                            __________________________________________________________________________|             
   Urinary Bladder                         |                                                          +  +            |             
      Hemorrhage                           |                                                             3            |             
      Transitional Epithelium, Necrosis    |                                                             3            |             
 _____________________________________________________________________________________________________________________|             
                                                             Page  33                                                               
NTP Experiment-Test: 88034-07                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09
Study Type: CHRONIC                                             OZONE/NNK                                         Date: 04/23/97  
Route: RESPIRATORY EXPOSURE WHOLE BODY                                                                            Time: 08:17:56  
                                                                                                                                    
 __________________________________________________________________________________________________________________________________ 
                                           | 4| 7| 7| 6| 7| 6| 6| 5| 4| 7| 4| 5| 6| 6| 6| 7| 6| 7| 7| 6| 7| 4| 6|     |            |
                             DAY ON TEST   | 8| 1| 3| 2| 3| 3| 6| 7| 9| 3| 4| 6| 4| 3| 0| 0| 8| 3| 3| 3| 2| 1| 8|     |            |
                                           | 1| 3| 6| 0| 3| 5| 9| 5| 6| 6| 4| 7| 1| 8| 4| 3| 3| 6| 6| 2| 5| 6| 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|     |      O     |
   FISCHER 344 RATS MALE                   | 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8|     |      T     |
                               ANIMAL ID   | 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8|     |      A     |
    .1M/KNNK                               | 2| 2| 2| 2| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 4| 4| 4| 4| 4| 4| 4| 4| 4|     |      L     |
    /OZONE                                 | 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8|     |            |
 __________________________________________________________________________________________________________________________________ 
 ALIMENTARY SYSTEM                         |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Intestine Large, Cecum                  |                                                                          |   1        |
                                            __________________________________________________________________________|____________|
   Intestine Small, Ileum                  |                                                                          |   1        |
      Peyer's Patch, Hyperplasia, Lymphoid |                                                                          |      1  2.0|
                                            __________________________________________________________________________|____________|
   Liver                                   |    +  +  +     +        +  +     +  +  +  +  +  +  +     +  +     +      |  36        |
      Angiectasis                          |                                                          2        2      |      3  2.0|
      Degeneration, Cystic                 |                         2  2        2  2  1        2                     |      8  1.9|
      Hepatodiaphragmatic Nodule           |                                           X        X                     |      3     |
      Inflammation                         |          2                                                               |      1  2.0|
      Vacuolization Cytoplasmic            |                                                 3        4               |      4  3.0|
                                            __________________________________________________________________________|____________|
   Mesentery                               |       +  +                       +     +        +           +            |  11        |
      Fat, Necrosis                        |       2                                2        2           2            |      7  2.1|
                                            __________________________________________________________________________|____________|
   Stomach, Forestomach                    |                                                                          |   1        |
      Inflammation, Chronic Active         |                                                                          |      1  3.0|
                                            __________________________________________________________________________|____________|
   Stomach, Glandular                      |                                                                          |   1        |
      Inflammation, Chronic Active         |                                                                          |      1  1.0|
                                            __________________________________________________________________________|____________|
   Tooth                                   |                                                                          |   1        |
      Developmental Malformation           |                                                                          |      1     |
 _____________________________________________________________________________________________________________________|            |
 CARDIOVASCULAR SYSTEM                     |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Heart                                   |                               +                                          |   2        |
      Pericardium, Fibrosis                |                               3                                          |      1  3.0|
 _____________________________________________________________________________________________________________________|            |
 ENDOCRINE SYSTEM                          |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Adrenal Cortex                          |                                                                          |   1        |
                                            __________________________________________________________________________|____________|
   Parathyroid Gland                       |                                                                          |   1        |
      Hyperplasia                          |                                                                          |      1  4.0|
                                            __________________________________________________________________________|____________|
   Pituitary Gland                         |       +  +  +  +  +        +        +  +  +     +     +  +  +  +  +      |  27        |
 _____________________________________________________________________________________________________________________|            |
 GENERAL BODY SYSTEM                       |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Peritoneum                              | +  +  +           +        +  +     +     +  +  +  +  +  +  +  +  +      |  31        |
      Inflammation, Chronic                | 1  1  1                    1  1     1     1  1  1  1  4  1  1  1  1      |     30  1.1|
 _____________________________________________________________________________________________________________________|            |
 GENITAL SYSTEM                            |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Epididymis                              |                   +                                                      |   1        |
                                            __________________________________________________________________________|____________|
   Penis                                   |                                                                          |   1        |
      Calculus Micro Observation Only      |                                                                          |      1     |
                                            __________________________________________________________________________|____________|
   Preputial Gland                         |                                                          +               |   2        |
      Inflammation, Chronic Active         |                                                                          |      1  2.0|
                                            __________________________________________________________________________|____________|
   Prostate                                |             +                                                            |   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  34                                                               
NTP Experiment-Test: 88034-07                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09
Study Type: CHRONIC                                             OZONE/NNK                                         Date: 04/23/97  
Route: RESPIRATORY EXPOSURE WHOLE BODY                                                                            Time: 08:17:56  
                                                                                                                                    
 __________________________________________________________________________________________________________________________________ 
                                           | 4| 7| 7| 6| 7| 6| 6| 5| 4| 7| 4| 5| 6| 6| 6| 7| 6| 7| 7| 6| 7| 4| 6|     |            |
                             DAY ON TEST   | 8| 1| 3| 2| 3| 3| 6| 7| 9| 3| 4| 6| 4| 3| 0| 0| 8| 3| 3| 3| 2| 1| 8|     |            |
                                           | 1| 3| 6| 0| 3| 5| 9| 5| 6| 6| 4| 7| 1| 8| 4| 3| 3| 6| 6| 2| 5| 6| 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|     |      O     |
   FISCHER 344 RATS MALE                   | 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8|     |      T     |
                               ANIMAL ID   | 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8|     |      A     |
    .1M/KNNK                               | 2| 2| 2| 2| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 4| 4| 4| 4| 4| 4| 4| 4| 4|     |      L     |
    /OZONE                                 | 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8|     |            |
 __________________________________________________________________________________________________________________________________ 
 GENITAL SYSTEM - cont                     |                                                                          |            |
                                           |                                                                          |            |
      Inflammation, Suppurative            |             2                                                            |      2  2.5|
                                            __________________________________________________________________________|____________|
   Testes                                  |       +  +  +     +  +     +     +  +  +     +     +  +     +            |  25        |
      Atrophy                              |                      3              4        4                           |      5  3.4|
 _____________________________________________________________________________________________________________________|            |
 HEMATOPOIETIC SYSTEM                      |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Bone Marrow                             |                                                                          |   1        |
                                            __________________________________________________________________________|____________|
   Lymph Node                              |                               +                    +                     |  10        |
      Pancreatic, Hyperplasia, Lymphoid    |                                                    3                     |      1  3.0|
      Renal, Hemorrhage                    |                               2                                          |      1  2.0|
      Renal, Hyperplasia, Lymphoid         |                                                                          |      1  2.0|
      Renal, Infiltration Cellular, Plasma |                                                                          |            |
          Cell                             |                                                                          |      1  2.0|
                                            __________________________________________________________________________|____________|
   Lymph Node, Bronchial                   | +  +  M  +  +  +  M  M  M  M  +  +  +  I  +  +  +  M  M  M  +  M  M      |  26        |
      Hemorrhage                           |                2              2                                          |      2  2.0|
                                            __________________________________________________________________________|____________|
   Lymph Node, Mandibular                  |                                  +                                       |   7        |
      Infiltration Cellular, Plasma Cell   |                                  2                                       |      1  2.0|
                                            __________________________________________________________________________|____________|
   Lymph Node, Mesenteric                  |                                                    +                     |  11        |
      Inflammation, Granulomatous          |                                                                          |      1  3.0|
                                            __________________________________________________________________________|____________|
   Lymph Node, Mediastinal                 | +  +  +  M  +  +  M  +  +  +  +  +  +  +  +  +  M  +  +  M  +  M  +      |  43        |
      Hemorrhage                           |                               3                                          |      2  2.5|
                                            __________________________________________________________________________|____________|
   Spleen                                  |    +  +        +  +  +  +  +     +  +  +  +  +  +  +  +     +     +      |  37        |
      Accessory Spleen                     |                         X                                                |      1     |
      Congestion                           |                                                                          |      1  2.0|
      Fibrosis                             |    2  3        2  1  2                    3     3           3     3      |     12  2.5|
                                            __________________________________________________________________________|____________|
   Thymus                                  |                                                                          |   3        |
 _____________________________________________________________________________________________________________________|            |
 INTEGUMENTARY SYSTEM                      |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Skin                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
      Hyperkeratosis                       |                                                                          |      1  3.0|
      Hyperplasia                          |                                                             3            |      1  3.0|
      Inflammation, Chronic                |                                                                          |      1  3.0|
      Dermis, Cyst                         |                                                                          |      1  3.0|
      Prepuce, Inflammation, Suppurative   |                                     2                                    |      3  2.3|
      Sebaceous Gland, Hyperplasia         |             2                                                            |      1  2.0|
      Subcutaneous Tissue, Skin, Site of   |                                                                          |            |
          Application, Inflammation,       |                                                                          |            |
          Chronic                          | 1  1  1  1     1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1      |     47  1.0|
 _____________________________________________________________________________________________________________________|            |
 MUSCULOSKELETAL SYSTEM                    |                                                                          |            |
                                           |                                                                          |            |
    None                                   |                                                                          |            |
 __________________________________________________________________________________________________________________________________ 
  * : Total animals with tissue examined microscopically; total animals with lesion and mean severity grade                         
  + : Tissue examined microscopically                M : Missing tissue                        1-4 : Lesion qualified as:           
  X : Lesion present but not qualified               A : Autolysis precludes examination               1) Minimal  3) Moderate      
  I : Insufficient tissue                        BLANK : Not examined                                  2) Mild     4) Marked        
                                                             Page  35                                                               
NTP Experiment-Test: 88034-07                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09
Study Type: CHRONIC                                             OZONE/NNK                                         Date: 04/23/97  
Route: RESPIRATORY EXPOSURE WHOLE BODY                                                                            Time: 08:17:56  
                                                                                                                                    
 __________________________________________________________________________________________________________________________________ 
                                           | 4| 7| 7| 6| 7| 6| 6| 5| 4| 7| 4| 5| 6| 6| 6| 7| 6| 7| 7| 6| 7| 4| 6|     |            |
                             DAY ON TEST   | 8| 1| 3| 2| 3| 3| 6| 7| 9| 3| 4| 6| 4| 3| 0| 0| 8| 3| 3| 3| 2| 1| 8|     |            |
                                           | 1| 3| 6| 0| 3| 5| 9| 5| 6| 6| 4| 7| 1| 8| 4| 3| 3| 6| 6| 2| 5| 6| 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|     |      O     |
   FISCHER 344 RATS MALE                   | 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8|     |      T     |
                               ANIMAL ID   | 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8| 8|     |      A     |
    .1M/KNNK                               | 2| 2| 2| 2| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 4| 4| 4| 4| 4| 4| 4| 4| 4|     |      L     |
    /OZONE                                 | 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8|     |            |
 __________________________________________________________________________________________________________________________________ 
 NERVOUS SYSTEM                            |                                                                          |            |
                                           |                                                                          |            |
    None                                   |                                                                          |            |
 _____________________________________________________________________________________________________________________|            |
 RESPIRATORY SYSTEM                        |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Larynx                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
      Inflammation, Suppurative            |             2                                            2               |      3  1.7|
                                            __________________________________________________________________________|____________|
   Lung                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
      Congestion                           |             2        2        1                 2                        |      5  1.8|
      Edema                                |                2                 1  1                                    |      3  1.3|
      Hemorrhage                           |                3                                                         |      1  3.0|
      Alveolar Epithelium, Hyperplasia,    |                                                                          |            |
           Atypical                        |                            2                       1  2           2      |     12  1.7|
      Alveolar Epithelium, Metaplasia      | 1  1  1  1  1     1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1      |     47  1.0|
      Alveolus, Infiltration Cellular,     |                                                                          |            |
           Histiocyte                      | 1                       1        1        1                    1         |      9  1.1|
      Interstitium, Fibrosis               | 1  1  1  1  1     1  1  1  1  1  1  1  1  1     1  1  1  1  1  1  1      |     46  1.0|
                                            __________________________________________________________________________|____________|
   Nose                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
      Inflammation, Suppurative            |                                                 3                        |      3  2.3|
      Thrombosis                           |                                                                          |      1  4.0|
      Goblet Cell, Lateral Wall,           |                                                                          |            |
          Hyperplasia                      | 1  1  2     1  1  1  1  2  1  1  1  1  1  1  1  1  1  1     1  1  1      |     45  1.1|
      Lateral Wall, Hyperplasia            | 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|
      Olfactory Epithelium, Degeneration,  |                                                                          |            |
           Hyaline                         | 1  2  2  2  3  1  3  2  2  2  2  1  3  2  2  1  1  2  1  2  3  2  2      |     48  1.9|
      Olfactory Epithelium, Metaplasia     |                                                 3                        |      1  3.0|
      Turbinate, Necrosis                  |    3                                                                     |      1  3.0|
                                            __________________________________________________________________________|____________|
   Trachea                                 | +  +  +  +  +  +  +  +  +  +  +  +  +  +  I  +  +  +  +  +  +  +  +      |  47        |
 _____________________________________________________________________________________________________________________|            |
 SPECIAL SENSES SYSTEM                     |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Zymbal's Gland                          | +                    +                                            +      |   3        |
 _____________________________________________________________________________________________________________________|            |
 URINARY SYSTEM                            |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Kidney                                  |    +  +     +           +  +  +     +     +     +        +  +     +      |  20        |
      Infarct                              |                                                                          |      1  2.0|
      Nephropathy                          |    3  3     3              3  3     3     4     4        4  3     4      |     18  3.3|
      Pigmentation, Hemosiderin            |                         4                                                |      1  4.0|
                                            __________________________________________________________________________|____________|
   Urinary Bladder                         |             +                                                            |   3        |
      Hemorrhage                           |             2                                                            |      2  2.5|
      Transitional Epithelium, Necrosis    |                                                                          |      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  36                                                               
NTP Experiment-Test: 88034-07                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09
Study Type: CHRONIC                                             OZONE/NNK                                         Date: 04/23/97  
Route: RESPIRATORY EXPOSURE WHOLE BODY                                                                            Time: 08:17:56  
                                                                                                                                    
 _____________________________________________________________________________________________________________________              
                                           | 6| 5| 5| 5| 2| 4| 7| 6| 6| 6| 6| 6| 6| 6| 7| 6| 6| 6| 4| 6| 6| 6| 7| 6| 5|             
                             DAY ON TEST   | 1| 6| 5| 5| 5| 5| 3| 8| 4| 0| 0| 8| 8| 6| 3| 4| 1| 5| 7| 9| 6| 4| 2| 8| 9|             
                                           | 7| 2| 8| 7| 3| 6| 6| 3| 1| 3| 3| 7| 3| 9| 6| 0| 0| 5| 0| 7| 1| 0| 5| 3| 7|             
 _____________________________________________________________________________________________________________________|             
                                           | 0| 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                   | 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9|             
                               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|             
    1M/K NNK                               | 0| 0| 0| 0| 0| 0| 0| 0| 0| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 2| 2| 2| 2| 2| 2|             
    /OZONE                                 | 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                         |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Intestine Large, Cecum                  |          +                                                               |             
      Ulcer                                |          4                                                               |             
                                            __________________________________________________________________________|             
   Intestine Small, Ileum                  |                                                                          |             
                                            __________________________________________________________________________|             
   Liver                                   | +     +  +     +     +  +  +  +  +  +  +  +  +  +  +     +  +  +  +  +  +|             
      Angiectasis                          |                                                    2                 3   |             
      Degeneration, Cystic                 |       2              2  2  2        3     2              3     3         |             
      Hepatodiaphragmatic Nodule           |       X                                                           X     X|             
      Hyperplasia, Focal                   |          3           2              4     3              4     4         |             
      Hyperplasia                          |                                        4                                 |             
      Infiltration Cellular, Mixed Cell    |                                                                3         |             
      Necrosis, Focal                      |                                                 2              3         |             
      Vacuolization Cytoplasmic, Focal     |                1                                                         |             
      Vacuolization Cytoplasmic            |                                                          3               |             
      Bile Duct, Hyperplasia               |                                     4                                    |             
      Centrilobular, Necrosis              |                                                          3               |             
                                            __________________________________________________________________________|             
   Mesentery                               |                         +        +                             +  +      |             
      Fat, Necrosis                        |                         3        3                             3  3      |             
                                            __________________________________________________________________________|             
   Stomach, Forestomach                    |                                                                          |             
      Hyperplasia, Squamous                |                                                                          |             
      Inflammation, Chronic Active         |                                                                          |             
                                            __________________________________________________________________________|             
   Tooth                                   |             +                                                            |             
      Developmental Malformation           |             X                                                            |             
 _____________________________________________________________________________________________________________________|             
 CARDIOVASCULAR SYSTEM                     |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Heart                                   |                                        +                 +               |             
      Fibrosis                             |                                        2                                 |             
      Atrium, Thrombosis                   |                                                          4               |             
 _____________________________________________________________________________________________________________________|             
 ENDOCRINE SYSTEM                          |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Adrenal Medulla                         |                                                 +                        |             
                                            __________________________________________________________________________|             
   Parathyroid Gland                       |                                                                      +   |             
      Hyperplasia                          |                                                                      3   |             
                                            __________________________________________________________________________|             
   Pituitary Gland                         |    +  +  +     +  +        +     +  +        +  +  +     +  +  +  +  +  +|             
      Pars Distalis, Hemorrhage            |                                                                          |             
      Pars Distalis, Hyperplasia           |                                                                      2   |             
                                            __________________________________________________________________________|             
   Thyroid Gland                           |                                                                          |             
 _____________________________________________________________________________________________________________________|             
 GENERAL BODY SYSTEM                       |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Peritoneum                              |          +     +  +  +  +     +  +              +  +     +     +     +  +|             
      Inflammation, Chronic                |          1     1  1  1  1     1  1              1  1     1     1     1  1|             
                                            __________________________________________________________________________|             
   Tissue NOS                              |                                                                          |             
 _____________________________________________________________________________________________________________________|             
 GENITAL SYSTEM                            |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Penis                                   |                                                    +                     |             
 _____________________________________________________________________________________________________________________|             
                                                             Page  37                                                               
NTP Experiment-Test: 88034-07                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09
Study Type: CHRONIC                                             OZONE/NNK                                         Date: 04/23/97  
Route: RESPIRATORY EXPOSURE WHOLE BODY                                                                            Time: 08:17:56  
                                                                                                                                    
 _____________________________________________________________________________________________________________________              
                                           | 6| 5| 5| 5| 2| 4| 7| 6| 6| 6| 6| 6| 6| 6| 7| 6| 6| 6| 4| 6| 6| 6| 7| 6| 5|             
                             DAY ON TEST   | 1| 6| 5| 5| 5| 5| 3| 8| 4| 0| 0| 8| 8| 6| 3| 4| 1| 5| 7| 9| 6| 4| 2| 8| 9|             
                                           | 7| 2| 8| 7| 3| 6| 6| 3| 1| 3| 3| 7| 3| 9| 6| 0| 0| 5| 0| 7| 1| 0| 5| 3| 7|             
 _____________________________________________________________________________________________________________________|             
                                           | 0| 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                   | 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9|             
                               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|             
    1M/K NNK                               | 0| 0| 0| 0| 0| 0| 0| 0| 0| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 2| 2| 2| 2| 2| 2|             
    /OZONE                                 | 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                     |                                                                          |             
                                           |                                                                          |             
      Edema                                |                                                    2                     |             
                                            __________________________________________________________________________|             
   Preputial Gland                         |                +                                                         |             
      Inflammation, Chronic Active         |                1                                                         |             
                                            __________________________________________________________________________|             
   Testes                                  | +  +              +                 +  +  +     +  +        +     +      |             
      Atrophy                              |                                                                          |             
 _____________________________________________________________________________________________________________________|             
 HEMATOPOIETIC SYSTEM                      |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Lymph Node                              |          +                    +        +              +              +  +|             
      Iliac, Infiltration Cellular, Plasma |                                                                          |             
          Cell                             |                                                                          |             
      Iliac, Pigmentation                  |                                                                          |             
      Renal, Infiltration Cellular, Plasma |                                                                          |             
          Cell                             |                                                                          |             
      Renal, Inflammation, Granulomatous   |                                                                          |             
                                            __________________________________________________________________________|             
   Lymph Node, Bronchial                   | +  M  +  +  +  +  +  M  +  M  +  +  +  +  M  +  +  +  +  M  +  M  +  +  +|             
                                            __________________________________________________________________________|             
   Lymph Node, Mandibular                  |                            +  +  +     +              +           +  +  +|             
      Hyperplasia, Lymphoid                |                                                                          |             
      Infiltration Cellular, Plasma Cell   |                            3                                             |             
                                            __________________________________________________________________________|             
   Lymph Node, Mesenteric                  |                   +                    +                             +   |             
                                            __________________________________________________________________________|             
   Lymph Node, Mediastinal                 | +  +  +  +  +  +  +  +  M  +  +  +  +  +  +  +  +  M  +  M  +  M  +  +  +|             
      Infiltration Cellular, Plasma Cell   |          2                                                               |             
                                            __________________________________________________________________________|             
   Spleen                                  | +     +           +  +  +  +  +  +  +  +  +  +     +  +  +  +  +  +  +  +|             
      Accessory Spleen                     |       X                                                                  |             
      Fibrosis                             |                      3     3              3              4        2  3   |             
      Hematopoietic Cell Proliferation     |                                                                4         |             
      Necrosis                             |                                                                3         |             
      Capsule, Fibrosis                    |                                                                          |             
                                            __________________________________________________________________________|             
   Thymus                                  |                                                                      +   |             
 _____________________________________________________________________________________________________________________|             
 INTEGUMENTARY SYSTEM                      |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Mammary Gland                           |    +                                                  +                  |             
      Galactocele                          |    3                                                                     |             
      Hyperplasia                          |                                                                          |             
                                            __________________________________________________________________________|             
   Skin                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Hyperkeratosis                       |                                                 3                        |             
      Inflammation, Chronic                |                                                                          |             
      Dermis, Cyst                         | 3                                                                        |             
      Prepuce, Inflammation, Suppurative   |                                           3                       2      |             
      Subcutaneous Tissue, Inflammation,   |                                                                          |             
           Chronic                         |                                                                4         |             
      Subcutaneous Tissue, Necrosis        |                                                                4         |             
      Subcutaneous Tissue, Skin, Site of   |                                                                          |             
          Application, Inflammation,       |                                                                          |             
          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  1|             
 _____________________________________________________________________________________________________________________|             
                                                             Page  38                                                               
NTP Experiment-Test: 88034-07                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09
Study Type: CHRONIC                                             OZONE/NNK                                         Date: 04/23/97  
Route: RESPIRATORY EXPOSURE WHOLE BODY                                                                            Time: 08:17:56  
                                                                                                                                    
 _____________________________________________________________________________________________________________________              
                                           | 6| 5| 5| 5| 2| 4| 7| 6| 6| 6| 6| 6| 6| 6| 7| 6| 6| 6| 4| 6| 6| 6| 7| 6| 5|             
                             DAY ON TEST   | 1| 6| 5| 5| 5| 5| 3| 8| 4| 0| 0| 8| 8| 6| 3| 4| 1| 5| 7| 9| 6| 4| 2| 8| 9|             
                                           | 7| 2| 8| 7| 3| 6| 6| 3| 1| 3| 3| 7| 3| 9| 6| 0| 0| 5| 0| 7| 1| 0| 5| 3| 7|             
 _____________________________________________________________________________________________________________________|             
                                           | 0| 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                   | 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9|             
                               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|             
    1M/K NNK                               | 0| 0| 0| 0| 0| 0| 0| 0| 0| 1| 1| 1| 1| 1| 1| 1| 1| 1| 1| 2| 2| 2| 2| 2| 2|             
    /OZONE                                 | 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5|             
 _____________________________________________________________________________________________________________________|             
 MUSCULOSKELETAL SYSTEM                    |                                                                          |             
                                           |                                                                          |             
    None                                   |                                                                          |             
 _____________________________________________________________________________________________________________________|             
 NERVOUS SYSTEM                            |                                                                          |             
                                           |                                                                          |             
    None                                   |                                                                          |             
 _____________________________________________________________________________________________________________________|             
 RESPIRATORY SYSTEM                        |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Larynx                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Inflammation, Suppurative            |                                                                1  2      |             
      Mineralization                       |                                                                         3|             
                                            __________________________________________________________________________|             
   Lung                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +|             
      Edema                                |                                                 2                        |             
      Hemorrhage                           |    2                                                                     |             
      Alveolar Epithelium, Hyperplasia,    |                                                                          |             
           Atypical                        | 2     1  1     1  3  2     3  4        3  3     2  2  1  3     2  2     2|             
      Alveolar Epithelium, Metaplasia      | 1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1     1  1     1|             
      Alveolus, Infiltration Cellular,     |                                                                          |             
           Histiocyte                      |    3     1     1                          2     2  2  1  1               |             
      Interstitium, Fibrosis               | 1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1     1  1     1|             
                                            __________________________________________________________________________|             
   Nose                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  A  +  +  +  +|             
      Inflammation, Suppurative            |                                                                          |             
      Goblet Cell, Lateral Wall,           |                                                                          |             
          Hyperplasia                      | 1  1  1  1     1  1     1  1  1  1  1     1  1  1  1  1  1     1  1  1  1|             
      Lateral Wall, Hyperplasia            | 1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1     1  1  1  1|             
      Olfactory Epithelium, Degeneration,  |                                                                          |             
           Hyaline                         | 2  2  3  1  2  2  1  2  2  3  3  2  2  2  1  2  2  2  1  3     1  2  2  2|             
                                            __________________________________________________________________________|             
   Trachea                                 | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  A  +  +  +  +|             
 _____________________________________________________________________________________________________________________|             
 SPECIAL SENSES SYSTEM                     |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Eye                                     |                                                                         +|             
      Cataract                             |                                                                         3|             
      Hemorrhage                           |                                                                          |             
      Ciliary Body, Retina, Degeneration   |                                                                         4|             
                                            __________________________________________________________________________|             
   Zymbal's Gland                          |                                                                          |             
 _____________________________________________________________________________________________________________________|             
 URINARY SYSTEM                            |                                                                          |             
                                           |                                                                          |             
                                            __________________________________________________________________________|             
   Kidney                                  |          +           +  +  +     +     +  +  +        +           +  +  +|             
      Cyst                                 |                                                                          |             
      Infarct                              |          2                                                               |             
      Nephropathy                          |                      4  3  3     3     3  4  3                    3  4  3|             
                                            __________________________________________________________________________|             
   Urinary Bladder                         |                                                                          |             
      Calculus Micro Observation Only      |                                                                          |             
 _____________________________________________________________________________________________________________________|             
                                                             Page  39                                                               
NTP Experiment-Test: 88034-07                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09
Study Type: CHRONIC                                             OZONE/NNK                                         Date: 04/23/97  
Route: RESPIRATORY EXPOSURE WHOLE BODY                                                                            Time: 08:17:56  
                                                                                                                                    
 __________________________________________________________________________________________________________________________________ 
                                           | 5| 7| 5| 7| 7| 6| 7| 7| 4| 6| 5| 6| 5| 6| 6| 5| 6| 6| 7| 5| 6| 4| 7|     |            |
                             DAY ON TEST   | 0| 3| 5| 3| 0| 3| 1| 3| 1| 0| 8| 6| 8| 7| 1| 8| 3| 8| 0| 8| 7| 0| 0|     |            |
                                           | 3| 6| 7| 6| 5| 5| 2| 6| 6| 2| 5| 9| 0| 1| 3| 2| 5| 7| 0| 1| 8| 3| 4|     |      T (*) |
 _____________________________________________________________________________________________________________________|            |
                                           | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|     |      O     |
   FISCHER 344 RATS MALE                   | 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9|     |      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|     |      A     |
    1M/K NNK                               | 2| 2| 2| 2| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 4| 4| 4| 4| 4| 4| 4| 4| 4|     |      L     |
    /OZONE                                 | 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8|     |            |
 __________________________________________________________________________________________________________________________________ 
 ALIMENTARY SYSTEM                         |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Intestine Large, Cecum                  |                                        +                                 |   2        |
      Ulcer                                |                                                                          |      1  4.0|
                                            __________________________________________________________________________|____________|
   Intestine Small, Ileum                  |                                           +                              |   1        |
                                            __________________________________________________________________________|____________|
   Liver                                   | +  +  +  +  +  +  +  +  +  +     +  +  +     +  +  +  +  +  +  +  +      |  42        |
      Angiectasis                          |                                                 3  2  3                  |      5  2.6|
      Degeneration, Cystic                 |    2     3  2     2  2           2           2     3  2                  |     17  2.3|
      Hepatodiaphragmatic Nodule           |       X  X                                                               |      5     |
      Hyperplasia, Focal                   |                            3                                             |      7  3.3|
      Hyperplasia                          |                                        3                                 |      2  3.5|
      Infiltration Cellular, Mixed Cell    |                                                                          |      1  3.0|
      Necrosis, Focal                      |                                        3                                 |      3  2.7|
      Vacuolization Cytoplasmic, Focal     |                                                                          |      1  1.0|
      Vacuolization Cytoplasmic            |                            2                                             |      2  2.5|
      Bile Duct, Hyperplasia               |                                                                          |      1  4.0|
      Centrilobular, Necrosis              |                                                                          |      1  3.0|
                                            __________________________________________________________________________|____________|
   Mesentery                               | +        +           +                                      +            |   8        |
      Fat, Necrosis                        | 3        2           3                                      2            |      8  2.8|
                                            __________________________________________________________________________|____________|
   Stomach, Forestomach                    |                                        +        +                        |   2        |
      Hyperplasia, Squamous                |                                        2        2                        |      2  2.0|
      Inflammation, Chronic Active         |                                                 3                        |      1  3.0|
                                            __________________________________________________________________________|____________|
   Tooth                                   |                                                                          |   1        |
      Developmental Malformation           |                                                                          |      1     |
 _____________________________________________________________________________________________________________________|            |
 CARDIOVASCULAR SYSTEM                     |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Heart                                   |                                                                          |   2        |
      Fibrosis                             |                                                                          |      1  2.0|
      Atrium, Thrombosis                   |                                                                          |      1  4.0|
 _____________________________________________________________________________________________________________________|            |
 ENDOCRINE SYSTEM                          |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Adrenal Medulla                         |                                                                          |   1        |
                                            __________________________________________________________________________|____________|
   Parathyroid Gland                       |                                                                          |   1        |
      Hyperplasia                          |                                                                          |      1  3.0|
                                            __________________________________________________________________________|____________|
   Pituitary Gland                         | +  +  +  +     +  +        +  +     +        +  +  +        +            |  30        |
      Pars Distalis, Hemorrhage            |                               4                                          |      1  4.0|
      Pars Distalis, Hyperplasia           | 2                                                                        |      2  2.0|
                                            __________________________________________________________________________|____________|
   Thyroid Gland                           |                                                    +                     |   1        |
 _____________________________________________________________________________________________________________________|            |
 GENERAL BODY SYSTEM                       |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Peritoneum                              |    +  +  +           +  +        +  +  +  +     +  +  +           +      |  26        |
 __________________________________________________________________________________________________________________________________ 
  * : 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: 88034-07                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09
Study Type: CHRONIC                                             OZONE/NNK                                         Date: 04/23/97  
Route: RESPIRATORY EXPOSURE WHOLE BODY                                                                            Time: 08:17:56  
                                                                                                                                    
 __________________________________________________________________________________________________________________________________ 
                                           | 5| 7| 5| 7| 7| 6| 7| 7| 4| 6| 5| 6| 5| 6| 6| 5| 6| 6| 7| 5| 6| 4| 7|     |            |
                             DAY ON TEST   | 0| 3| 5| 3| 0| 3| 1| 3| 1| 0| 8| 6| 8| 7| 1| 8| 3| 8| 0| 8| 7| 0| 0|     |            |
                                           | 3| 6| 7| 6| 5| 5| 2| 6| 6| 2| 5| 9| 0| 1| 3| 2| 5| 7| 0| 1| 8| 3| 4|     |      T (*) |
 _____________________________________________________________________________________________________________________|            |
                                           | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|     |      O     |
   FISCHER 344 RATS MALE                   | 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9|     |      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|     |      A     |
    1M/K NNK                               | 2| 2| 2| 2| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 4| 4| 4| 4| 4| 4| 4| 4| 4|     |      L     |
    /OZONE                                 | 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8|     |            |
 __________________________________________________________________________________________________________________________________ 
 GENERAL BODY SYSTEM - cont                |                                                                          |            |
                                           |                                                                          |            |
      Inflammation, Chronic                |    1  1  1           1  1        1  1  1  1     1  1  1           1      |     26  1.0|
                                            __________________________________________________________________________|____________|
   Tissue NOS                              |             +                                                            |   1        |
 _____________________________________________________________________________________________________________________|            |
 GENITAL SYSTEM                            |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Penis                                   |                                              +                           |   2        |
      Edema                                |                                              1                           |      2  1.5|
                                            __________________________________________________________________________|____________|
   Preputial Gland                         |                         +                                      +         |   3        |
      Inflammation, Chronic Active         |                         2                                      3         |      3  2.0|
                                            __________________________________________________________________________|____________|
   Testes                                  |    +                 +           +  +  +           +  +     +     +      |  19        |
      Atrophy                              |                                        3                                 |      1  3.0|
 _____________________________________________________________________________________________________________________|            |
 HEMATOPOIETIC SYSTEM                      |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Lymph Node                              |          +        +     +        +        +  +  +  +     +  +  +         |  17        |
      Iliac, Infiltration Cellular, Plasma |                                                                          |            |
          Cell                             |                                                    3                     |      1  3.0|
      Iliac, Pigmentation                  |                                                    2                     |      1  2.0|
      Renal, Infiltration Cellular, Plasma |                                                                          |            |
          Cell                             |                                                    2                     |      1  2.0|
      Renal, Inflammation, Granulomatous   |                                                    3                     |      1  3.0|
                                            __________________________________________________________________________|____________|
   Lymph Node, Bronchial                   | M  M  +  M  M  M  +  M  +  M  M  M  M  +  +  +  +  M  +  M  +  +  +      |  30        |
                                            __________________________________________________________________________|____________|
   Lymph Node, Mandibular                  | +        +                                +  +        +  +  +            |  15        |
      Hyperplasia, Lymphoid                |                                                       2                  |      1  2.0|
      Infiltration Cellular, Plasma Cell   |                                                                          |      1  3.0|
                                            __________________________________________________________________________|____________|
   Lymph Node, Mesenteric                  |          +                                +  +              +  +         |   8        |
                                            __________________________________________________________________________|____________|
   Lymph Node, Mediastinal                 | +  +  +  +  +  +  +  +  +  +  +  +  M  +  +  +  +  +  +  +  +  +  +      |  43        |
      Infiltration Cellular, Plasma Cell   |                                                                          |      1  2.0|
                                            __________________________________________________________________________|____________|
   Spleen                                  | +  +     +     +  +  +  +     +  +     +  +  +  +  +  +  +  +  +  +      |  39        |
      Accessory Spleen                     |                                                                          |      1     |
      Fibrosis                             | 2        3        3  2                 2              3  3               |     13  2.8|
      Hematopoietic Cell Proliferation     |                                                                          |      1  4.0|
      Necrosis                             |                                                                          |      1  3.0|
      Capsule, Fibrosis                    |                1                                                         |      1  1.0|
                                            __________________________________________________________________________|____________|
   Thymus                                  |          +                                                               |   2        |
 _____________________________________________________________________________________________________________________|            |
 INTEGUMENTARY SYSTEM                      |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Mammary Gland                           |    +                                               +                     |   4        |
      Galactocele                          |                                                    3                     |      2  3.0|
      Hyperplasia                          |    3                                                                     |      1  3.0|
                                            __________________________________________________________________________|____________|
   Skin                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
 __________________________________________________________________________________________________________________________________ 
  * : 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: 88034-07                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09
Study Type: CHRONIC                                             OZONE/NNK                                         Date: 04/23/97  
Route: RESPIRATORY EXPOSURE WHOLE BODY                                                                            Time: 08:17:56  
                                                                                                                                    
 __________________________________________________________________________________________________________________________________ 
                                           | 5| 7| 5| 7| 7| 6| 7| 7| 4| 6| 5| 6| 5| 6| 6| 5| 6| 6| 7| 5| 6| 4| 7|     |            |
                             DAY ON TEST   | 0| 3| 5| 3| 0| 3| 1| 3| 1| 0| 8| 6| 8| 7| 1| 8| 3| 8| 0| 8| 7| 0| 0|     |            |
                                           | 3| 6| 7| 6| 5| 5| 2| 6| 6| 2| 5| 9| 0| 1| 3| 2| 5| 7| 0| 1| 8| 3| 4|     |      T (*) |
 _____________________________________________________________________________________________________________________|            |
                                           | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|     |      O     |
   FISCHER 344 RATS MALE                   | 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9|     |      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|     |      A     |
    1M/K NNK                               | 2| 2| 2| 2| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 4| 4| 4| 4| 4| 4| 4| 4| 4|     |      L     |
    /OZONE                                 | 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8|     |            |
 __________________________________________________________________________________________________________________________________ 
 INTEGUMENTARY SYSTEM - cont               |                                                                          |            |
                                           |                                                                          |            |
      Hyperkeratosis                       |                         2                                                |      2  2.5|
      Inflammation, Chronic                |                                                       2                  |      1  2.0|
      Dermis, Cyst                         |                                                                          |      1  3.0|
      Prepuce, Inflammation, Suppurative   |                                                                          |      2  2.5|
      Subcutaneous Tissue, Inflammation,   |                                                                          |            |
           Chronic                         |                                                                          |      1  4.0|
      Subcutaneous Tissue, Necrosis        |                                                                          |      1  4.0|
      Subcutaneous Tissue, Skin, Site of   |                                                                          |            |
          Application, Inflammation,       |                                                                          |            |
          Chronic                          | 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|
 _____________________________________________________________________________________________________________________|            |
 MUSCULOSKELETAL SYSTEM                    |                                                                          |            |
                                           |                                                                          |            |
    None                                   |                                                                          |            |
 _____________________________________________________________________________________________________________________|            |
 NERVOUS SYSTEM                            |                                                                          |            |
                                           |                                                                          |            |
    None                                   |                                                                          |            |
 _____________________________________________________________________________________________________________________|            |
 RESPIRATORY SYSTEM                        |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Larynx                                  | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
      Inflammation, Suppurative            |       1        1                       1              1                  |      6  1.2|
      Mineralization                       |                                                                          |      1  3.0|
                                            __________________________________________________________________________|____________|
   Lung                                    | +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  48        |
      Edema                                |                                                                          |      1  2.0|
      Hemorrhage                           | 3                                               1                        |      3  2.0|
      Alveolar Epithelium, Hyperplasia,    |                                                                          |            |
           Atypical                        |    2  2  2  2  2  1  2        2  2  3        2  2  1  2     3     2      |     33  2.1|
      Alveolar Epithelium, Metaplasia      |    1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1      |     45  1.0|
      Alveolus, Infiltration Cellular,     |                                                                          |            |
           Histiocyte                      |       1     2           1                                   2     2      |     13  1.6|
      Interstitium, Fibrosis               |    1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1      |     45  1.0|
                                            __________________________________________________________________________|____________|
   Nose                                    | A  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  46        |
      Inflammation, Suppurative            |                2                                                         |      1  2.0|
      Goblet Cell, Lateral Wall,           |                                                                          |            |
          Hyperplasia                      |    1  1  1     1  1  2  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1      |     42  1.0|
      Lateral Wall, Hyperplasia            |    1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1      |     46  1.0|
      Olfactory Epithelium, Degeneration,  |                                                                          |            |
           Hyaline                         |    2  3  2  2  1  2  2  2  2  2  1  2  1  3  2  2  1  2  2  2  1  2      |     46  1.9|
                                            __________________________________________________________________________|____________|
   Trachea                                 | A  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +  +      |  46        |
 _____________________________________________________________________________________________________________________|            |
 SPECIAL SENSES 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  42                                                               
NTP Experiment-Test: 88034-07                  NONNEOPLASTIC LESIONS BY INDIVIDUAL ANIMAL                         Report: PEIRPT09
Study Type: CHRONIC                                             OZONE/NNK                                         Date: 04/23/97  
Route: RESPIRATORY EXPOSURE WHOLE BODY                                                                            Time: 08:17:56  
                                                                                                                                    
 __________________________________________________________________________________________________________________________________ 
                                           | 5| 7| 5| 7| 7| 6| 7| 7| 4| 6| 5| 6| 5| 6| 6| 5| 6| 6| 7| 5| 6| 4| 7|     |            |
                             DAY ON TEST   | 0| 3| 5| 3| 0| 3| 1| 3| 1| 0| 8| 6| 8| 7| 1| 8| 3| 8| 0| 8| 7| 0| 0|     |            |
                                           | 3| 6| 7| 6| 5| 5| 2| 6| 6| 2| 5| 9| 0| 1| 3| 2| 5| 7| 0| 1| 8| 3| 4|     |      T (*) |
 _____________________________________________________________________________________________________________________|            |
                                           | 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0| 0|     |      O     |
   FISCHER 344 RATS MALE                   | 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9| 9|     |      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|     |      A     |
    1M/K NNK                               | 2| 2| 2| 2| 3| 3| 3| 3| 3| 3| 3| 3| 3| 3| 4| 4| 4| 4| 4| 4| 4| 4| 4|     |      L     |
    /OZONE                                 | 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| 1| 2| 3| 4| 5| 6| 7| 8|     |            |
 __________________________________________________________________________________________________________________________________ 
 SPECIAL SENSES SYSTEM - cont              |                                                                          |            |
                                           |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Eye                                     |                            +                             +  +            |   4        |
      Cataract                             |                                                             2            |      2  2.5|
      Hemorrhage                           |                                                          2               |      1  2.0|
      Ciliary Body, Retina, Degeneration   |                                                             3            |      2  3.5|
                                            __________________________________________________________________________|____________|
   Zymbal's Gland                          |                                                       +                  |   1        |
 _____________________________________________________________________________________________________________________|            |
 URINARY SYSTEM                            |                                                                          |            |
                                           |                                                                          |            |
                                            __________________________________________________________________________|____________|
   Kidney                                  |    +     +        +  +     +           +  +  +     +  +  +  +     +      |  25        |
      Cyst                                 |                      2                                                   |      1  2.0|
      Infarct                              |                                                                          |      1  2.0|
      Nephropathy                          |    3     3        4  3     3           3  3        3  3  3  2     3      |     22  3.1|
                                            __________________________________________________________________________|____________|
   Urinary Bladder                         |                +                                                         |   1        |
      Calculus Micro Observation Only      |                X                                                         |      1     |
 __________________________________________________________________________________________________________________________________ 
  * : Total animals with tissue examined microscopically; total animals with lesion and mean severity grade                         
  + : Tissue examined microscopically                M : Missing tissue                        1-4 : Lesion qualified as:           
  X : Lesion present but not qualified               A : Autolysis precludes examination               1) Minimal  3) Moderate      
  I : Insufficient tissue                        BLANK : Not examined                                  2) Mild     4) Marked        
                                                             Page  43                                                               
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                             ----------              END OF REPORT             ----------                                           
                             ------------------------------------------------------------