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https://ntp.niehs.nih.gov/go/5568

TDMS Study 89029-06 Pathology Tables

NTP Experiment-Test: 89029-06         INCIDENCE RATES OF NONNEOPLASTIC LESIONS BY ANATOMIC SITE (a)               Report: PEIRPT03
Study Type: CHRONIC                                       MAGNETIC FIELDS (EMF)                                   Date: 01/09/98
Route: MAGNETIC FIELDS                                                                                            Time: 12:39:32

                                                         MERGED GROUPS




       Facility:  I. I. T. Research Institute

       Chemical CAS #:  ELECTROMAG

       Lock Date:  09/09/97

       Cage Range:  All

       Reasons For Removal:    All

       Removal Date Range:     All

       Treatment Groups:       Merge     001   001,011                  SHAM     CONTROL
                               Merge     002   002,012                  SHAM     CONTROL
                               Merge     003   003,013                  .02      GAUSS
                               Merge     004   004,014                  .02      GAUSS
                               Merge     005   005,015                  2 GAUSS
                               Merge     006   006,016                  2 GAUSS
                               Merge     007   009,019                  10       GAUSS
                               Merge     008   010,020                  10       GAUSS
                               Merge     009   007,017                  10 GAUSS   INTER
                               Merge     010   008,018                  10 GAUSS   INTER

























a  Number of animals examined microscopically at site and number of animals with lesion

                                                              Page   1


NTP Experiment-Test: 89029-06         INCIDENCE RATES OF NONNEOPLASTIC LESIONS BY ANATOMIC SITE (a)               Report: PEIRPT03
Study Type: CHRONIC                                       MAGNETIC FIELDS (EMF)                                   Date: 01/09/98  
Route: MAGNETIC FIELDS                                                                                            Time: 12:39:32  
____________________________________________________________________________________________________________________________________

         B6C3F1 MICE FEMALE                        SHAM         .02          2 GAUSS      10           10 GAUSS                     
                                                    CONTROL      GAUSS                     GAUSS          INTER                     
____________________________________________________________________________________________________________________________________

DISPOSITION SUMMARY                                                                                                                 

  Animals Initially In Study                         100          100          100          100          100                        
  Early Deaths                                                                                                                      
    Natural Death                                     23           18           13           18           15                        
    Moribund Sacrifice                                 6            7            6            7            8                        
    Accidently Killed                                  1            1            2            1                                     
  Survivors                                                                                                                         
    Natural Death                                      1                                                                            
    Terminal Sacrifice                                69           74           79           74           77                        

  Animals Examined Microscopically                   100          100          100          100          100                        
____________________________________________________________________________________________________________________________________
                                                                                                                                    
 ALIMENTARY SYSTEM                                                                                                                  
                                                                                                                                    
   Esophagus                                          (97)         (100)        (99)         (98)         (100)                     
      Epithelium, Hyperplasia, Focal                                                                       1 (1%)                   
   Gallbladder                                        (70)         (84)         (87)         (79)         (91)                      
      Infiltration Cellular, Lymphocyte                             1 (1%)                    1 (1%)                                
      Infiltration Cellular, Mixed Cell                                                       1 (1%)                                
      Epithelium, Cyst                                 5 (7%)      14 (17%)      2 (2%)       3 (4%)      11 (12%)                  
      Epithelium, Cytoplasmic Alteration                            1 (1%)                                                          
      Epithelium, Vacuolization Cytoplasmic                                      1 (1%)                                             
   Intestine Large, Rectum                            (82)         (90)         (90)         (88)         (94)                      
      Lymphoid Tissue, Hyperplasia                                                            1 (1%)                                
      Serosa, Inflammation, Chronic Active                                       1 (1%)                                             
   Intestine Large, Cecum                             (78)         (87)         (90)         (87)         (92)                      
      Lymphoid Tissue, Hyperplasia                    25 (32%)     33 (38%)     35 (39%)     24 (28%)     32 (35%)                  
      Lymphoid Tissue, Necrosis                                                                            1 (1%)                   
   Intestine Small, Duodenum                          (77)         (85)         (90)         (87)         (91)                      
      Inflammation                                     1 (1%)                                                                       
      Muscularis, Hypertrophy                          1 (1%)                                                                       
      Peyer's Patch, Hyperplasia                                                 1 (1%)       1 (1%)       2 (2%)                   
   Intestine Small, Jejunum                           (79)         (86)         (89)         (91)         (92)                      
      Inflammation                                                               1 (1%)                    1 (1%)                   
      Muscularis, Hypertrophy                          6 (8%)       8 (9%)       5 (6%)       3 (3%)       7 (8%)                   
      Peyer's Patch, Hyperplasia                       3 (4%)       6 (7%)       5 (6%)                    7 (8%)                   
      Peyer's Patch, Inflammation                                   1 (1%)                                                          
      Peyer's Patch, Necrosis, Lymphoid                                                                    1 (1%)                   
      Serosa, Inflammation                                                       1 (1%)       1 (1%)                                
   Intestine Small, Ileum                             (78)         (85)         (90)         (87)         (93)                      
      Inflammation                                     1 (1%)       1 (1%)                                 2 (2%)                   
      Artery, Inflammation                                                                                 1 (1%)                   
      Muscularis, Hypertrophy                         17 (22%)     16 (19%)     20 (22%)     17 (20%)     15 (16%)                  
      Peyer's Patch, Hyperplasia                       4 (5%)       2 (2%)       4 (4%)       4 (5%)       5 (5%)                   
      Serosa, Inflammation                                                       1 (1%)                                             
   Liver                                              (98)         (97)         (98)         (99)         (100)                     

a  Number of animals examined microscopically at site and number of animals with lesion                                             

                                                             Page    2                                                              
NTP Experiment-Test: 89029-06         INCIDENCE RATES OF NONNEOPLASTIC LESIONS BY ANATOMIC SITE (a)               Report: PEIRPT03
Study Type: CHRONIC                                       MAGNETIC FIELDS (EMF)                                   Date: 01/09/98  
Route: MAGNETIC FIELDS                                                                                            Time: 12:39:32  
____________________________________________________________________________________________________________________________________

         B6C3F1 MICE FEMALE                        SHAM         .02          2 GAUSS      10           10 GAUSS                     
                                                    CONTROL      GAUSS                     GAUSS          INTER                     
____________________________________________________________________________________________________________________________________
                                                                                                                                    
ALIMENTARY SYSTEM - CONT                                                                                                            
      Angiectasis                                      1 (1%)                                 2 (2%)       3 (3%)                   
      Basophilic Focus                                 2 (2%)       3 (3%)       4 (4%)       2 (2%)                                
      Basophilic Focus, Multiple                                                 1 (1%)                    1 (1%)                   
      Clear Cell Focus                                 4 (4%)       3 (3%)       7 (7%)       5 (5%)       4 (4%)                   
      Clear Cell Focus, Multiple                                                 1 (1%)       1 (1%)       1 (1%)                   
      Developmental Malformation                                    1 (1%)       2 (2%)                    1 (1%)                   
      Eosinophilic Focus                               5 (5%)       3 (3%)      10 (10%)     10 (10%)      9 (9%)                   
      Eosinophilic Focus, Multiple                     1 (1%)       1 (1%)                    2 (2%)                                
      Fibrosis                                         1 (1%)                                                                       
      Hematopoietic Cell Proliferation                                           1 (1%)                    1 (1%)                   
      Hemorrhage                                                                 1 (1%)       1 (1%)                                
      Hepatodiaphragmatic Nodule                                                 1 (1%)                                             
      Infiltration Cellular, Focal, Mast Cell                       1 (1%)                                                          
      Infiltration Cellular, Focal, Lymphocyte         1 (1%)                                 2 (2%)       1 (1%)                   
      Infiltration Cellular, Focal,                                                                                                 
          Polymorphonuclear                                                                                1 (1%)                   
      Infiltration Cellular, Focal, Mixed Cell        53 (54%)     58 (60%)     48 (49%)     48 (48%)     51 (51%)                  
      Inflammation, Focal                                           1 (1%)                                                          
      Mixed Cell Focus                                              1 (1%)       2 (2%)       1 (1%)                                
      Necrosis                                         4 (4%)       2 (2%)       4 (4%)                    5 (5%)                   
      Pigmentation                                                                                         1 (1%)                   
      Bile Duct, Cyst                                                                         1 (1%)                                
      Hepatocyte, Vacuolization Cytoplasmic           14 (14%)     15 (15%)     14 (14%)     17 (17%)     14 (14%)                  
      Sinusoid, Centrilobular, Dilatation                                                                  1 (1%)                   
   Mesentery                                          (36)         (27)         (30)         (30)         (53)                      
      Hemorrhage                                       1 (3%)       1 (4%)       1 (3%)       1 (3%)                                
      Inflammation                                                                                         1 (2%)                   
      Arteriole, Inflammation                                                                              1 (2%)                   
      Artery, Mineralization                           1 (3%)                                                                       
      Fat, Inflammation                                6 (17%)      4 (15%)      5 (17%)      4 (13%)     14 (26%)                  
      Fat, Necrosis                                   22 (61%)     16 (59%)     23 (77%)     22 (73%)     31 (58%)                  
   Pancreas                                           (87)         (94)         (96)         (94)         (95)                      
      Angiectasis, Focal                               1 (1%)                                                                       
      Cytoplasmic Alteration                                                     1 (1%)                                             
      Infiltration Cellular, Focal, Mixed Cell         7 (8%)      12 (13%)      7 (7%)      10 (11%)     12 (13%)                  
      Infiltration Cellular, Lymphocyte                5 (6%)                    1 (1%)       3 (3%)       5 (5%)                   
      Inflammation                                                               1 (1%)                    1 (1%)                   
      Lipomatosis                                     21 (24%)     16 (17%)     23 (24%)     29 (31%)     33 (35%)                  
      Vacuolization Cytoplasmic                       12 (14%)     21 (22%)     18 (19%)     16 (17%)     15 (16%)                  
      Acinus, Cytoplasmic Alteration                   1 (1%)       3 (3%)       4 (4%)       2 (2%)       5 (5%)                   
      Acinus, Degeneration, Focal                                   1 (1%)                                                          
      Acinus, Hypertrophy, Focal                       1 (1%)                    2 (2%)                    1 (1%)                   
      Artery, Inflammation                                                                    1 (1%)       1 (1%)                   
      Duct, Cyst                                       1 (1%)       1 (1%)       3 (3%)       1 (1%)       2 (2%)                   
   Salivary Glands                                    (94)         (98)         (97)         (98)         (99)                      
      Atrophy                                                       1 (1%)                    1 (1%)                                
      Fibrosis                                                                                             1 (1%)                   

a  Number of animals examined microscopically at site and number of animals with lesion                                             

                                                             Page    3                                                              
NTP Experiment-Test: 89029-06         INCIDENCE RATES OF NONNEOPLASTIC LESIONS BY ANATOMIC SITE (a)               Report: PEIRPT03
Study Type: CHRONIC                                       MAGNETIC FIELDS (EMF)                                   Date: 01/09/98  
Route: MAGNETIC FIELDS                                                                                            Time: 12:39:32  
____________________________________________________________________________________________________________________________________

         B6C3F1 MICE FEMALE                        SHAM         .02          2 GAUSS      10           10 GAUSS                     
                                                    CONTROL      GAUSS                     GAUSS          INTER                     
____________________________________________________________________________________________________________________________________
                                                                                                                                    
ALIMENTARY SYSTEM - CONT                                                                                                            
      Infiltration Cellular, Lymphocyte               74 (79%)     83 (85%)     77 (79%)     75 (77%)     79 (80%)                  
      Infiltration Cellular, Mixed Cell                                                                    1 (1%)                   
      Pigmentation                                                                            1 (1%)                                
      Arteriole, Inflammation                                                                              1 (1%)                   
      Duct, Cyst                                                    1 (1%)                                                          
      Duct, Cytoplasmic Alteration                                                            1 (1%)                                
   Stomach, Forestomach                               (91)         (92)         (93)         (94)         (97)                      
      Infiltration Cellular, Lymphocyte                1 (1%)                                              1 (1%)                   
      Inflammation                                                               3 (3%)       1 (1%)       1 (1%)                   
      Ulcer, Focal                                                               1 (1%)                    1 (1%)                   
      Epithelium, Atrophy                              6 (7%)      11 (12%)      5 (5%)      10 (11%)      6 (6%)                   
      Epithelium, Cyst                                                                        1 (1%)                                
      Epithelium, Hyperplasia                          4 (4%)       5 (5%)       4 (4%)       5 (5%)       5 (5%)                   
      Muscularis, Mineralization, Focal                                                       1 (1%)                                
   Stomach, Glandular                                 (86)         (90)         (93)         (93)         (94)                      
      Infiltration Cellular, Lymphocyte                7 (8%)       8 (9%)       3 (3%)                    5 (5%)                   
      Inflammation                                     1 (1%)       1 (1%)       1 (1%)       1 (1%)                                
      Ulcer, Focal                                                  1 (1%)                                 1 (1%)                   
      Epithelium, Atrophy                             14 (16%)     24 (27%)     20 (22%)     18 (19%)     28 (30%)                  
      Epithelium, Cyst, Focal                         23 (27%)     19 (21%)     17 (18%)     12 (13%)     20 (21%)                  
      Epithelium, Mineralization                       1 (1%)                                                                       
      Serosa, Hemorrhage                                                                                   1 (1%)                   
____________________________________________________________________________________________________________________________________
                                                                                                                                    
 CARDIOVASCULAR SYSTEM                                                                                                              
                                                                                                                                    
   Blood Vessel                                       (98)         (100)        (94)         (99)         (96)                      
      Aorta, Mineralization                            2 (2%)                                                                       
      Aorta, Adventitia, Inflammation, Chronic                                                                                      
          Active                                                                 1 (1%)                                             
   Heart                                              (98)         (100)        (100)        (99)         (100)                     
      Inflammation                                     1 (1%)                                                                       
      Artery, Inflammation                                          1 (1%)                    1 (1%)       1 (1%)                   
      Artery, Mineralization                           1 (1%)                                                                       
      Atrium, Infiltration Cellular, Lymphocyte                                               1 (1%)                                
      Atrium, Thrombosis                               1 (1%)                                 1 (1%)                                
      Epicardium, Inflammation, Chronic Active                                   1 (1%)                                             
      Myocardium, Degeneration                         1 (1%)       4 (4%)                    1 (1%)       1 (1%)                   
      Myocardium, Inflammation                                                                1 (1%)                                
      Myocardium, Mineralization                       1 (1%)       3 (3%)       1 (1%)                                             
      Myocardium, Necrosis, Focal                                                1 (1%)                                             
      Valve, Thrombosis                                                          1 (1%)       1 (1%)                                
____________________________________________________________________________________________________________________________________
                                                                                                                                    

a  Number of animals examined microscopically at site and number of animals with lesion                                             

                                                             Page    4                                                              
NTP Experiment-Test: 89029-06         INCIDENCE RATES OF NONNEOPLASTIC LESIONS BY ANATOMIC SITE (a)               Report: PEIRPT03
Study Type: CHRONIC                                       MAGNETIC FIELDS (EMF)                                   Date: 01/09/98  
Route: MAGNETIC FIELDS                                                                                            Time: 12:39:32  
____________________________________________________________________________________________________________________________________

         B6C3F1 MICE FEMALE                        SHAM         .02          2 GAUSS      10           10 GAUSS                     
                                                    CONTROL      GAUSS                     GAUSS          INTER                     
____________________________________________________________________________________________________________________________________
                                                                                                                                    
 ENDOCRINE SYSTEM                                                                                                                   
                                                                                                                                    
   Adrenal Cortex                                     (92)         (98)         (99)         (99)         (99)                      
      Cytoplasmic Alteration, Focal                    1 (1%)                                                                       
      Degeneration, Fatty                                                                     1 (1%)                                
      Hematopoietic Cell Proliferation                                                                     2 (2%)                   
      Infiltration Cellular, Lymphocyte                                          1 (1%)                                             
      Inflammation                                     1 (1%)                                                                       
      Bilateral, Capsule, Hyperplasia                 88 (96%)     88 (90%)     85 (86%)     89 (90%)     94 (95%)                  
      Bilateral, Capsule, Mineralization                            1 (1%)                                                          
      Bilateral, Zona Fasciculata, Hypertrophy,                                                                                     
           Focal                                                                 1 (1%)                                             
      Bilateral, Zona Glomerulosa, Hyperplasia,                                                                                     
           Focal                                                                 1 (1%)                                             
      Bilateral, Zona Reticularis, Degeneration,                                                                                    
           Fatty                                       2 (2%)                    4 (4%)                    2 (2%)                   
      Capsule, Hyperplasia                             3 (3%)       8 (8%)      12 (12%)      9 (9%)       5 (5%)                   
      Zona Fasciculata, Hyperplasia, Focal                                       1 (1%)                    3 (3%)                   
      Zona Fasciculata, Hypertrophy, Diffuse                        1 (1%)                                                          
      Zona Fasciculata, Hypertrophy, Focal             2 (2%)                    2 (2%)       5 (5%)                                
      Zona Reticularis, Degeneration, Fatty            2 (2%)       2 (2%)       3 (3%)                    1 (1%)                   
   Adrenal Medulla                                    (90)         (95)         (97)         (97)         (98)                      
      Hyperplasia                                      3 (3%)       8 (8%)       2 (2%)                    3 (3%)                   
      Bilateral, Amyloid Deposition                                              1 (1%)                                             
   Islets, Pancreatic                                 (87)         (95)         (94)         (94)         (94)                      
      Degeneration                                                  1 (1%)                                                          
      Hyperplasia                                     40 (46%)     60 (63%)     42 (45%)     48 (51%)     47 (50%)                  
      Infiltration Cellular, Focal, Mixed Cell                      2 (2%)       1 (1%)       3 (3%)       1 (1%)                   
      Infiltration Cellular, Lymphocyte                                                                    1 (1%)                   
      Inflammation, Chronic Active                                               1 (1%)                                             
   Parathyroid Gland                                  (63)         (53)         (53)         (53)         (58)                      
      Cyst                                                          1 (2%)       1 (2%)                                             
      Degeneration                                                                            1 (2%)                                
      Hyperplasia                                     11 (17%)      8 (15%)      7 (13%)      6 (11%)      8 (14%)                  
      Infiltration Cellular, Lymphocyte                2 (3%)       1 (2%)       2 (4%)       2 (4%)                                
      Infiltration Cellular, Mixed Cell                                                                    1 (2%)                   
      Inflammation, Focal                                                        2 (4%)                                             
      Vacuolization Cytoplasmic                        1 (2%)                                              1 (2%)                   
   Pineal Gland                                       (52)         (37)         (67)         (61)         (61)                      
      Hyperplasia                                                                                          1 (2%)                   
      Infiltration Cellular, Lymphocyte                                                                    1 (2%)                   
      Inflammation                                                                            1 (2%)                                
   Pituitary Gland                                    (83)         (92)         (87)         (89)         (93)                      
      Hemorrhage                                                                              1 (1%)                                
      Pars Distalis, Cyst                                           2 (2%)       3 (3%)       1 (1%)       4 (4%)                   
      Pars Distalis, Hyperplasia, Diffuse                                                     1 (1%)                                
      Pars Distalis, Hyperplasia, Focal               37 (45%)     50 (54%)     33 (38%)     35 (39%)     35 (38%)                  
      Pars Distalis, Hypertrophy, Focal                                          3 (3%)       1 (1%)       1 (1%)                   

a  Number of animals examined microscopically at site and number of animals with lesion                                             

                                                             Page    5                                                              
NTP Experiment-Test: 89029-06         INCIDENCE RATES OF NONNEOPLASTIC LESIONS BY ANATOMIC SITE (a)               Report: PEIRPT03
Study Type: CHRONIC                                       MAGNETIC FIELDS (EMF)                                   Date: 01/09/98  
Route: MAGNETIC FIELDS                                                                                            Time: 12:39:32  
____________________________________________________________________________________________________________________________________

         B6C3F1 MICE FEMALE                        SHAM         .02          2 GAUSS      10           10 GAUSS                     
                                                    CONTROL      GAUSS                     GAUSS          INTER                     
____________________________________________________________________________________________________________________________________
                                                                                                                                    
ENDOCRINE SYSTEM - CONT                                                                                                             
      Rathke's Cleft, Cyst                                          1 (1%)                                                          
   Thyroid Gland                                      (92)         (99)         (98)         (98)         (98)                      
      Infiltration Cellular, Lymphocyte                                          3 (3%)                                             
      Inflammation, Focal                              2 (2%)                    3 (3%)       4 (4%)       2 (2%)                   
      Bilateral, Infiltration Cellular, Lymphocyte                                            1 (1%)                                
      Follicle, Cyst                                  21 (23%)     21 (21%)     25 (26%)     22 (22%)     37 (38%)                  
      Follicular Cell, Hyperplasia, Focal              3 (3%)       5 (5%)       1 (1%)       1 (1%)                                
      Follicular Cell, Hypertrophy, Diffuse            2 (2%)                                                                       
____________________________________________________________________________________________________________________________________
                                                                                                                                    
 GENERAL BODY SYSTEM                                                                                                                
                                                                                                                                    
   Tissue NOS                                         (1)          (1)          (3)                                                 
      Inflammation, Chronic Active                                               1 (33%)                                            
____________________________________________________________________________________________________________________________________
                                                                                                                                    
 GENITAL SYSTEM                                                                                                                     
                                                                                                                                    
   Clitoral Gland                                     (89)         (84)         (85)         (84)         (82)                      
      Atrophy                                         25 (28%)     19 (23%)     16 (19%)     21 (25%)     17 (21%)                  
      Cyst                                            29 (33%)     26 (31%)     15 (18%)     18 (21%)     19 (23%)                  
      Inflammation                                                               1 (1%)                    1 (1%)                   
      Arteriole, Inflammation                                                                 1 (1%)                                
      Bilateral, Atrophy                              55 (62%)     56 (67%)     61 (72%)     55 (65%)     57 (70%)                  
      Bilateral, Cyst                                 55 (62%)     56 (67%)     66 (78%)     58 (69%)     52 (63%)                  
      Bilateral, Inflammation                          2 (2%)       1 (1%)                                                          
   Ovary                                              (79)         (91)         (95)         (94)         (96)                      
      Amyloid Deposition                                                                                   1 (1%)                   
      Angiectasis                                                   2 (2%)       3 (3%)                    3 (3%)                   
      Atrophy                                          3 (4%)       1 (1%)       1 (1%)       2 (2%)       1 (1%)                   
      Cyst                                            20 (25%)     23 (25%)     28 (29%)     32 (34%)     21 (22%)                  
      Hemorrhage                                                    1 (1%)                    1 (1%)       1 (1%)                   
      Infiltration Cellular, Mast Cell                 1 (1%)                                                                       
      Infiltration Cellular, Mixed Cell                                                       1 (1%)                                
      Inflammation, Chronic Active                                               2 (2%)                                             
      Mineralization                                   1 (1%)                                 1 (1%)                                
      Pigmentation                                                  1 (1%)                                                          
      Thrombosis                                                                 1 (1%)                    1 (1%)                   
      Bilateral, Amyloid Deposition                                                           1 (1%)                                
      Bilateral, Atrophy                               1 (1%)       2 (2%)       2 (2%)       3 (3%)       2 (2%)                   
      Bilateral, Cyst                                  2 (3%)                    2 (2%)       1 (1%)       3 (3%)                   
      Germinal Epithelium, Hyperplasia                                                        1 (1%)                                
      Interstitial Cell, Hyperplasia                                                                       1 (1%)                   
   Uterus                                             (92)         (97)         (98)         (99)         (100)                     
      Amyloid Deposition                                            1 (1%)                                 1 (1%)                   
      Angiectasis                                      1 (1%)       3 (3%)       2 (2%)                    3 (3%)                   
      Hemorrhage                                       1 (1%)       1 (1%)                                                          

a  Number of animals examined microscopically at site and number of animals with lesion                                             

                                                             Page    6                                                              
NTP Experiment-Test: 89029-06         INCIDENCE RATES OF NONNEOPLASTIC LESIONS BY ANATOMIC SITE (a)               Report: PEIRPT03
Study Type: CHRONIC                                       MAGNETIC FIELDS (EMF)                                   Date: 01/09/98  
Route: MAGNETIC FIELDS                                                                                            Time: 12:39:32  
____________________________________________________________________________________________________________________________________

         B6C3F1 MICE FEMALE                        SHAM         .02          2 GAUSS      10           10 GAUSS                     
                                                    CONTROL      GAUSS                     GAUSS          INTER                     
____________________________________________________________________________________________________________________________________
                                                                                                                                    
GENITAL SYSTEM - CONT                                                                                                               
      Hydrometra                                      24 (26%)     18 (19%)     16 (16%)     20 (20%)     22 (22%)                  
      Inflammation                                     2 (2%)                                                                       
      Inflammation, Chronic                                         1 (1%)                                                          
      Thrombosis                                                    1 (1%)                                                          
      Bilateral, Atrophy                                            1 (1%)                                                          
      Bilateral, Hydrometra                           24 (26%)     15 (15%)     24 (24%)     21 (21%)     26 (26%)                  
      Bilateral, Endometrium, Amyloid Deposition       1 (1%)                                                                       
      Bilateral, Endometrium, Hyperplasia, Cystic     32 (35%)     44 (45%)     41 (42%)     45 (45%)     38 (38%)                  
      Cervix, Angiectasis                                                        1 (1%)                                             
      Endometrium, Angiectasis                                                                1 (1%)                                
      Endometrium, Hyperplasia, Cystic                22 (24%)     27 (28%)     26 (27%)     21 (21%)     24 (24%)                  
____________________________________________________________________________________________________________________________________
                                                                                                                                    
 HEMATOPOIETIC SYSTEM                                                                                                               
                                                                                                                                    
   Bone Marrow                                        (96)         (99)         (97)         (99)         (100)                     
      Angiectasis                                                   1 (1%)                                 2 (2%)                   
      Atrophy                                                                    1 (1%)                    1 (1%)                   
      Hyperplasia                                     23 (24%)     13 (13%)     13 (13%)     14 (14%)     19 (19%)                  
      Infiltration Cellular, Focal, Lymphocyte                                   1 (1%)                                             
      Myelofibrosis                                   10 (10%)     18 (18%)     17 (18%)     10 (10%)     21 (21%)                  
      Necrosis                                                      1 (1%)                                                          
      Myeloid Cell, Hyperplasia                        3 (3%)                                                                       
   Lymph Node                                         (19)         (15)         (4)          (14)         (12)                      
      Ectasia                                          2 (11%)      2 (13%)      2 (50%)      1 (7%)       1 (8%)                   
      Hemorrhage                                       1 (5%)       2 (13%)      1 (25%)      1 (7%)       1 (8%)                   
      Hyperplasia, Reticulum Cell                                                                          1 (8%)                   
      Infiltration Cellular, Mast Cell                                           1 (25%)                                            
      Infiltration Cellular, Histiocyte                             1 (7%)                                 1 (8%)                   
      Lumbar, Ectasia                                  3 (16%)      1 (7%)       1 (25%)      2 (14%)                               
      Lumbar, Hemorrhage                               4 (21%)                   1 (25%)      1 (7%)                                
      Lumbar, Pigmentation                             1 (5%)                                                                       
      Mediastinal, Hemorrhage                                                                 1 (7%)                                
      Mediastinal, Infiltration Cellular, Mixed                                                                                     
          Cell                                                      1 (7%)                                                          
      Renal, Ectasia                                                1 (7%)                                                          
   Lymph Node, Mandibular                             (84)         (94)         (89)         (91)         (92)                      
      Atrophy                                          3 (4%)       7 (7%)       4 (4%)       4 (4%)       3 (3%)                   
      Hemorrhage                                       2 (2%)       2 (2%)       1 (1%)       2 (2%)       3 (3%)                   
      Hyperplasia                                      8 (10%)     10 (11%)     12 (13%)      4 (4%)       4 (4%)                   
      Hyperplasia, Reticulum Cell                                   2 (2%)       1 (1%)       2 (2%)       2 (2%)                   
      Infiltration Cellular, Plasma Cell               2 (2%)       1 (1%)       2 (2%)       1 (1%)       1 (1%)                   
      Infiltration Cellular, Histiocyte                                          1 (1%)       1 (1%)                                
      Infiltration Cellular, Mixed Cell                2 (2%)       1 (1%)       2 (2%)       1 (1%)       1 (1%)                   
      Pigmentation                                    22 (26%)      9 (10%)     18 (20%)     10 (11%)     18 (20%)                  
   Lymph Node, Mesenteric                             (83)         (88)         (89)         (92)         (95)                      
      Angiectasis                                      1 (1%)       1 (1%)                                                          

a  Number of animals examined microscopically at site and number of animals with lesion                                             

                                                             Page    7                                                              
NTP Experiment-Test: 89029-06         INCIDENCE RATES OF NONNEOPLASTIC LESIONS BY ANATOMIC SITE (a)               Report: PEIRPT03
Study Type: CHRONIC                                       MAGNETIC FIELDS (EMF)                                   Date: 01/09/98  
Route: MAGNETIC FIELDS                                                                                            Time: 12:39:32  
____________________________________________________________________________________________________________________________________

         B6C3F1 MICE FEMALE                        SHAM         .02          2 GAUSS      10           10 GAUSS                     
                                                    CONTROL      GAUSS                     GAUSS          INTER                     
____________________________________________________________________________________________________________________________________
                                                                                                                                    
HEMATOPOIETIC SYSTEM - CONT                                                                                                         
      Atrophy                                         12 (14%)     10 (11%)     24 (27%)     21 (23%)     22 (23%)                  
      Ectasia                                          3 (4%)                    4 (4%)       2 (2%)                                
      Hemorrhage                                       3 (4%)       2 (2%)       4 (4%)       4 (4%)       2 (2%)                   
      Hyperplasia                                      2 (2%)       1 (1%)       4 (4%)                    2 (2%)                   
      Hyperplasia, Reticulum Cell                      3 (4%)       7 (8%)      13 (15%)      8 (9%)      15 (16%)                  
      Infiltration Cellular, Plasma Cell               5 (6%)       4 (5%)       2 (2%)       1 (1%)       6 (6%)                   
      Infiltration Cellular, Histiocyte               50 (60%)     45 (51%)     47 (53%)     43 (47%)     41 (43%)                  
      Infiltration Cellular, Mixed Cell                4 (5%)       1 (1%)       2 (2%)       5 (5%)       5 (5%)                   
      Inflammation, Focal                                                        1 (1%)                                             
      Artery, Inflammation                                                                    1 (1%)                                
   Spleen                                             (91)         (93)         (95)         (93)         (99)                      
      Congestion                                       1 (1%)                                                                       
      Fibrosis, Focal                                               1 (1%)                                                          
      Hematopoietic Cell Proliferation                74 (81%)     77 (83%)     87 (92%)     83 (89%)     92 (93%)                  
      Infarct                                                       1 (1%)                                 1 (1%)                   
      Infiltration Cellular, Mast Cell                              1 (1%)                                                          
      Infiltration Cellular, Plasma Cell                                         1 (1%)                                             
      Pigmentation                                    17 (19%)      6 (6%)       8 (8%)      12 (13%)     12 (12%)                  
      Lymphoid Follicle, Atrophy                       6 (7%)       4 (4%)       7 (7%)       3 (3%)       3 (3%)                   
      Lymphoid Follicle, Hyperplasia                  31 (34%)     31 (33%)     32 (34%)     34 (37%)     40 (40%)                  
      Lymphoid Follicle, Necrosis                                                1 (1%)                    1 (1%)                   
      Red Pulp, Atrophy                                2 (2%)       3 (3%)                                                          
   Thymus                                             (78)         (92)         (84)         (75)         (89)                      
      Angiectasis                                      1 (1%)       2 (2%)       3 (4%)       3 (4%)       2 (2%)                   
      Atrophy                                         22 (28%)     20 (22%)     24 (29%)     29 (39%)     27 (30%)                  
      Cyst, Focal                                      5 (6%)       2 (2%)       3 (4%)       9 (12%)      3 (3%)                   
      Hemorrhage                                                                              1 (1%)       2 (2%)                   
      Hyperplasia, Lymphoid                           31 (40%)     19 (21%)     20 (24%)     24 (32%)     25 (28%)                  
      Artery, Inflammation                                                                                 1 (1%)                   
      Thymocyte, Necrosis                                                        1 (1%)                    3 (3%)                   
____________________________________________________________________________________________________________________________________
                                                                                                                                    
 INTEGUMENTARY SYSTEM                                                                                                               
                                                                                                                                    
   Mammary Gland                                      (94)         (98)         (99)         (99)         (98)                      
      Hyperplasia                                      3 (3%)       3 (3%)       5 (5%)       2 (2%)       3 (3%)                   
      Infiltration Cellular, Lymphocyte                             1 (1%)       1 (1%)                                             
      Artery, Inflammation                                          1 (1%)                                                          
      Duct, Dilatation                                10 (11%)     15 (15%)     16 (16%)     17 (17%)     12 (12%)                  
   Skin                                               (99)         (100)        (100)        (100)        (100)                     
      Hemorrhage                                                                 1 (1%)                                             
      Ulcer, Focal                                     2 (2%)                                                                       
      Artery, Inflammation                             1 (1%)                                                                       
____________________________________________________________________________________________________________________________________
                                                                                                                                    

a  Number of animals examined microscopically at site and number of animals with lesion                                             

                                                             Page    8                                                              
NTP Experiment-Test: 89029-06         INCIDENCE RATES OF NONNEOPLASTIC LESIONS BY ANATOMIC SITE (a)               Report: PEIRPT03
Study Type: CHRONIC                                       MAGNETIC FIELDS (EMF)                                   Date: 01/09/98  
Route: MAGNETIC FIELDS                                                                                            Time: 12:39:32  
____________________________________________________________________________________________________________________________________

         B6C3F1 MICE FEMALE                        SHAM         .02          2 GAUSS      10           10 GAUSS                     
                                                    CONTROL      GAUSS                     GAUSS          INTER                     
____________________________________________________________________________________________________________________________________
                                                                                                                                    
 MUSCULOSKELETAL SYSTEM                                                                                                             
                                                                                                                                    
   Skeletal Muscle                                    (7)          (3)          (3)          (4)          (4)                       
      Degeneration                                                               1 (33%)                                            
      Necrosis                                         1 (14%)                                                                      
____________________________________________________________________________________________________________________________________
                                                                                                                                    
 NERVOUS SYSTEM                                                                                                                     
                                                                                                                                    
   Brain                                              (99)         (100)        (98)         (98)         (100)                     
      Infiltration Cellular, Focal, Mixed Cell                                                             1 (1%)                   
      Artery, Inflammation                                                                                 1 (1%)                   
      Cerebellum, Developmental Malformation, Focal                              1 (1%)                                             
      Choroid Plexus, Infiltration Cellular,                                                                                        
          Lymphocyte                                                                          1 (1%)                                
      Hypothalamus, Compression                                     2 (2%)       3 (3%)       3 (3%)                                
      Hypothalamus, Hemorrhage                                                                1 (1%)                                
      Thalamus, Infiltration Cellular, Lymphocyte                   1 (1%)                                                          
      Thalamus, Mineralization                        47 (47%)     68 (68%)     55 (56%)     60 (61%)     72 (72%)                  
      Ventricle, Hydrocephalus                                      2 (2%)                                                          
      Ventricle, Infiltration Cellular, Lymphocyte                                            1 (1%)                                
____________________________________________________________________________________________________________________________________
                                                                                                                                    
 RESPIRATORY SYSTEM                                                                                                                 
                                                                                                                                    
   Lung                                               (95)         (100)        (99)         (99)         (100)                     
      Congestion                                       1 (1%)                    1 (1%)                                             
      Fibrosis                                                                                             1 (1%)                   
      Hemorrhage                                       2 (2%)                    1 (1%)                    1 (1%)                   
      Infiltration Cellular, Lymphocyte               32 (34%)     37 (37%)     33 (33%)     34 (34%)     30 (30%)                  
      Inflammation, Focal                              2 (2%)       1 (1%)       1 (1%)       1 (1%)       1 (1%)                   
      Metaplasia, Focal, Osseous                                    1 (1%)       1 (1%)                                             
      Alveolar Epithelium, Hyperplasia, Focal          4 (4%)       1 (1%)       2 (2%)                    1 (1%)                   
      Alveolus, Infiltration Cellular, Histiocyte      1 (1%)       4 (4%)       1 (1%)       2 (2%)                                
      Artery, Mineralization                           2 (2%)                                                                       
      Serosa, Inflammation                                                       2 (2%)                                             
   Trachea                                            (94)         (100)        (98)         (99)         (98)                      
      Artery, Inflammation                                                                                 1 (1%)                   
____________________________________________________________________________________________________________________________________
                                                                                                                                    
 SPECIAL SENSES SYSTEM                                                                                                              
                                                                                                                                    
   Eye                                                (2)          (2)          (1)          (1)          (2)                       
      Cornea, Inflammation                             2 (100%)                  1 (100%)                                           
      Lens, Degeneration                                            1 (50%)                                                         
      Lens, Mineralization                                                                    1 (100%)                              
   Harderian Gland                                    (98)         (97)         (99)         (96)         (97)                      
      Infiltration Cellular, Lymphocyte               13 (13%)     12 (12%)     18 (18%)     16 (17%)     20 (21%)                  

a  Number of animals examined microscopically at site and number of animals with lesion                                             

                                                             Page    9                                                              
NTP Experiment-Test: 89029-06         INCIDENCE RATES OF NONNEOPLASTIC LESIONS BY ANATOMIC SITE (a)               Report: PEIRPT03
Study Type: CHRONIC                                       MAGNETIC FIELDS (EMF)                                   Date: 01/09/98  
Route: MAGNETIC FIELDS                                                                                            Time: 12:39:32  
____________________________________________________________________________________________________________________________________

         B6C3F1 MICE FEMALE                        SHAM         .02          2 GAUSS      10           10 GAUSS                     
                                                    CONTROL      GAUSS                     GAUSS          INTER                     
____________________________________________________________________________________________________________________________________
                                                                                                                                    
SPECIAL SENSES SYSTEM - CONT                                                                                                        
      Bilateral, Infiltration Cellular, Lymphocyte    14 (14%)     11 (11%)     18 (18%)     16 (17%)     16 (16%)                  
____________________________________________________________________________________________________________________________________
                                                                                                                                    
 URINARY SYSTEM                                                                                                                     
                                                                                                                                    
   Kidney                                             (92)         (96)         (98)         (98)         (99)                      
      Hydronephrosis                                                1 (1%)                    1 (1%)       1 (1%)                   
      Infarct, Acute                                                             1 (1%)                                             
      Infiltration Cellular, Lymphocyte                             1 (1%)                                 1 (1%)                   
      Artery, Inflammation                                                       1 (1%)                                             
      Bilateral, Artery, Inflammation                                                         1 (1%)                                
      Bilateral, Artery, Mineralization                1 (1%)                                                                       
      Bilateral, Artery, Cortex, Inflammation                                                              1 (1%)                   
      Bilateral, Cortex, Cyst, Multiple                             1 (1%)                                                          
      Bilateral, Cortex, Infiltration Cellular,                                                                                     
           Lymphocyte                                 11 (12%)      8 (8%)       7 (7%)       7 (7%)       8 (8%)                   
      Bilateral, Cortex, Inflammation                  1 (1%)                                                                       
      Bilateral, Cortex, Mineralization                1 (1%)       1 (1%)                                                          
      Bilateral, Cortex, Renal Tubule,                                                                                              
          Accumulation, Hyaline Droplet                                          2 (2%)                    3 (3%)                   
      Bilateral, Cortex, Renal Tubule, Degeneration    7 (8%)      11 (11%)      7 (7%)       8 (8%)       9 (9%)                   
      Bilateral, Cortex, Renal Tubule, Dilatation      1 (1%)       1 (1%)       1 (1%)                    1 (1%)                   
      Bilateral, Cortex, Renal Tubule,                                                                                              
          Vacuolization Cytoplasmic                                                                        2 (2%)                   
      Bilateral, Glomerulus, Amyloid Deposition        1 (1%)                                                                       
      Bilateral, Glomerulus, Inflammation                           1 (1%)                                 1 (1%)                   
      Bilateral, Medulla, Infiltration Cellular,                                                                                    
           Lymphocyte                                 26 (28%)     29 (30%)     38 (39%)     31 (32%)     37 (37%)                  
      Bilateral, Medulla, Mineralization               1 (1%)                                 1 (1%)                                
      Cortex, Cyst                                                                            3 (3%)                                
      Cortex, Infiltration Cellular, Plasma Cell                                 1 (1%)                                             
      Cortex, Infiltration Cellular, Lymphocyte       13 (14%)      9 (9%)      14 (14%)      8 (8%)       8 (8%)                   
      Cortex, Infiltration Cellular, Mixed Cell                                               1 (1%)                                
      Cortex, Metaplasia, Focal, Osseous               4 (4%)       3 (3%)       3 (3%)       3 (3%)       3 (3%)                   
      Cortex, Necrosis                                                                                     1 (1%)                   
      Cortex, Renal Tubule, Degeneration               3 (3%)       7 (7%)       4 (4%)       4 (4%)       4 (4%)                   
      Cortex, Renal Tubule, Dilatation                                                        2 (2%)                                
      Medulla, Cyst                                                                           1 (1%)                                
      Medulla, Infiltration Cellular, Lymphocyte      21 (23%)     24 (25%)     18 (18%)     27 (28%)     20 (20%)                  
      Medulla, Inflammation                            1 (1%)                    1 (1%)                                             
      Medulla, Mineralization                          2 (2%)       1 (1%)                    1 (1%)       1 (1%)                   
      Pelvis, Calculus Micro Observation Only          3 (3%)       2 (2%)       2 (2%)       1 (1%)       2 (2%)                   
   Urinary Bladder                                    (79)         (87)         (94)         (89)         (92)                      
      Infiltration Cellular, Plasma Cell               1 (1%)                                                                       
      Infiltration Cellular, Lymphocyte                8 (10%)      3 (3%)       4 (4%)       6 (7%)       5 (5%)                   
      Arteriole, Inflammation                                                                 1 (1%)       1 (1%)                   
      Artery, Inflammation                                                       1 (1%)                                             

a  Number of animals examined microscopically at site and number of animals with lesion                                             

                                                             Page   10                                                              
NTP Experiment-Test: 89029-06         INCIDENCE RATES OF NONNEOPLASTIC LESIONS BY ANATOMIC SITE (a)               Report: PEIRPT03
Study Type: CHRONIC                                       MAGNETIC FIELDS (EMF)                                   Date: 01/09/98  
Route: MAGNETIC FIELDS                                                                                            Time: 12:39:32  
____________________________________________________________________________________________________________________________________

         B6C3F1 MICE FEMALE                        SHAM         .02          2 GAUSS      10           10 GAUSS                     
                                                    CONTROL      GAUSS                     GAUSS          INTER                     
____________________________________________________________________________________________________________________________________
                                                                                                                                    
URINARY SYSTEM - CONT                                                                                                               
      Serosa, Inflammation, Chronic Active                                                                 1 (1%)                   
                                                                                                                                    

a  Number of animals examined microscopically at site and number of animals with lesion                                             

                                                             Page   11                                                              
NTP Experiment-Test: 89029-06         INCIDENCE RATES OF NONNEOPLASTIC LESIONS BY ANATOMIC SITE (a)               Report: PEIRPT03
Study Type: CHRONIC                                       MAGNETIC FIELDS (EMF)                                   Date: 01/09/98  
Route: MAGNETIC FIELDS                                                                                            Time: 12:39:32  
____________________________________________________________________________________________________________________________________

         B6C3F1 MICE MALE                          SHAM         .02          2 GAUSS      10           10 GAUSS                     
                                                    CONTROL      GAUSS                     GAUSS          INTER                     
____________________________________________________________________________________________________________________________________

DISPOSITION SUMMARY                                                                                                                 

  Animals Initially In Study                         100          100          100          100          100                        
  Early Deaths                                                                                                                      
    Natural Death                                     13           15           10           24           18                        
    Moribund Sacrifice                                11           13            6           14            8                        
  Survivors                                                                                                                         
    Terminal Sacrifice                                76           72           84           62           73                        
    Natural Death                                                                                          1                        

  Animals Examined Microscopically                   100          100          100          100          100                        
____________________________________________________________________________________________________________________________________
                                                                                                                                    
 ALIMENTARY SYSTEM                                                                                                                  
                                                                                                                                    
   Gallbladder                                        (84)         (83)         (84)         (75)         (82)                      
      Congestion                                                                 1 (1%)                                             
      Inflammation, Granulomatous                                   1 (1%)                                                          
      Epithelium, Cyst                                              4 (5%)       2 (2%)       2 (3%)       2 (2%)                   
      Epithelium, Hyperplasia, Focal                   1 (1%)                                                                       
   Intestine Large, Colon                             (93)         (94)         (92)         (83)         (85)                      
      Lymphoid Tissue, Hyperplasia                                                            1 (1%)                                
      Muscularis, Hypertrophy                                                                              1 (1%)                   
   Intestine Large, Rectum                            (93)         (90)         (93)         (81)         (87)                      
      Lymphoid Tissue, Hyperplasia                                  1 (1%)                                                          
   Intestine Large, Cecum                             (90)         (89)         (92)         (81)         (85)                      
      Inflammation                                                  1 (1%)                    1 (1%)                                
      Lymphoid Tissue, Hyperplasia                    41 (46%)     33 (37%)     37 (40%)     20 (25%)     46 (54%)                  
      Serosa, Fibrosis                                                                                     1 (1%)                   
   Intestine Small, Duodenum                          (89)         (88)         (92)         (79)         (84)                      
      Infiltration Cellular, Histiocyte                             1 (1%)                                                          
      Muscularis, Inflammation                                      1 (1%)                                                          
      Peyer's Patch, Hyperplasia                       2 (2%)                                              1 (1%)                   
   Intestine Small, Jejunum                           (89)         (94)         (93)         (80)         (85)                      
      Inflammation                                                               1 (1%)                    1 (1%)                   
      Epithelium, Hyperplasia, Focal                                                                       1 (1%)                   
      Muscularis, Hypertrophy                                       3 (3%)       1 (1%)                    2 (2%)                   
      Peyer's Patch, Hyperplasia                       1 (1%)       5 (5%)       1 (1%)                    1 (1%)                   
      Serosa, Inflammation                                                                    1 (1%)                                
   Intestine Small, Ileum                             (91)         (89)         (92)         (81)         (84)                      
      Inflammation                                                  1 (1%)                                                          
      Epithelium, Degeneration                                                                             1 (1%)                   
      Muscularis, Hypertrophy                                       9 (10%)      8 (9%)                    7 (8%)                   
      Peyer's Patch, Hyperplasia                                    1 (1%)                    1 (1%)                                
      Serosa, Inflammation                                          1 (1%)                                                          
   Liver                                              (100)        (100)        (100)        (98)         (99)                      
      Basophilic Focus                                              2 (2%)                                 2 (2%)                   
      Clear Cell Focus                                 7 (7%)       9 (9%)       9 (9%)       7 (7%)       9 (9%)                   

a  Number of animals examined microscopically at site and number of animals with lesion                                             

                                                             Page   12                                                              
NTP Experiment-Test: 89029-06         INCIDENCE RATES OF NONNEOPLASTIC LESIONS BY ANATOMIC SITE (a)               Report: PEIRPT03
Study Type: CHRONIC                                       MAGNETIC FIELDS (EMF)                                   Date: 01/09/98  
Route: MAGNETIC FIELDS                                                                                            Time: 12:39:32  
____________________________________________________________________________________________________________________________________

         B6C3F1 MICE MALE                          SHAM         .02          2 GAUSS      10           10 GAUSS                     
                                                    CONTROL      GAUSS                     GAUSS          INTER                     
____________________________________________________________________________________________________________________________________
                                                                                                                                    
ALIMENTARY SYSTEM - CONT                                                                                                            
      Clear Cell Focus, Multiple                       7 (7%)       9 (9%)       6 (6%)       4 (4%)       5 (5%)                   
      Congestion                                                                              1 (1%)                                
      Eosinophilic Focus                              10 (10%)     12 (12%)     11 (11%)     14 (14%)     15 (15%)                  
      Eosinophilic Focus, Multiple                     2 (2%)       1 (1%)       4 (4%)       1 (1%)       1 (1%)                   
      Hematopoietic Cell Proliferation                                                                     1 (1%)                   
      Hepatodiaphragmatic Nodule                                                              2 (2%)                                
      Infiltration Cellular, Focal, Mixed Cell         6 (6%)      10 (10%)     14 (14%)     10 (10%)     11 (11%)                  
      Inflammation, Focal                                                                     1 (1%)                                
      Inflammation, Granulomatous                                   1 (1%)                                                          
      Metaplasia, Focal, Osseous                                                                           1 (1%)                   
      Mixed Cell Focus                                 4 (4%)       1 (1%)       3 (3%)       4 (4%)       3 (3%)                   
      Necrosis                                         7 (7%)       6 (6%)       4 (4%)       4 (4%)       3 (3%)                   
      Pigmentation                                                               1 (1%)                                             
      Thrombosis, Focal                                             1 (1%)                                                          
      Bile Duct, Cyst                                  2 (2%)                                              1 (1%)                   
      Hepatocyte, Vacuolization Cytoplasmic           13 (13%)      9 (9%)       6 (6%)       6 (6%)       5 (5%)                   
      Hepatocyte, Centrilobular, Hypertrophy                                                               1 (1%)                   
      Sinusoid, Centrilobular, Dilatation                           1 (1%)                                                          
   Mesentery                                          (13)         (16)         (8)          (10)         (9)                       
      Infiltration Cellular, Histiocyte                1 (8%)                                                                       
      Inflammation                                                  1 (6%)                    1 (10%)                               
      Artery, Inflammation                             1 (8%)       1 (6%)       1 (13%)                                            
      Fat, Inflammation                                1 (8%)       3 (19%)      2 (25%)                                            
      Fat, Necrosis                                   11 (85%)     11 (69%)      4 (50%)      6 (60%)      7 (78%)                  
   Pancreas                                           (99)         (99)         (98)         (95)         (98)                      
      Cytoplasmic Alteration                                                                               1 (1%)                   
      Infiltration Cellular, Focal, Mixed Cell         1 (1%)                    1 (1%)       1 (1%)                                
      Infiltration Cellular, Lymphocyte                1 (1%)       4 (4%)       2 (2%)                    5 (5%)                   
      Inflammation                                                               1 (1%)                                             
      Lipomatosis                                      1 (1%)      11 (11%)     14 (14%)      1 (1%)       4 (4%)                   
      Necrosis                                                                                             1 (1%)                   
      Vacuolization Cytoplasmic                       16 (16%)     31 (31%)     28 (29%)      5 (5%)      28 (29%)                  
      Acinus, Atrophy                                  1 (1%)                    1 (1%)                    2 (2%)                   
      Acinus, Cytoplasmic Alteration                                1 (1%)       3 (3%)                    4 (4%)                   
      Acinus, Degeneration                                                                    1 (1%)                                
      Acinus, Hypertrophy, Focal                                    1 (1%)       1 (1%)                                             
      Duct, Cyst                                       2 (2%)       1 (1%)       1 (1%)       2 (2%)                                
   Salivary Glands                                    (99)         (99)         (98)         (96)         (99)                      
      Atrophy                                          1 (1%)       1 (1%)       1 (1%)       1 (1%)       1 (1%)                   
      Infiltration Cellular, Lymphocyte               66 (67%)     65 (66%)     72 (73%)     61 (64%)     69 (70%)                  
      Vacuolization Cytoplasmic                                     1 (1%)                                                          
   Stomach, Forestomach                               (99)         (98)         (97)         (96)         (99)                      
      Diverticulum                                                               1 (1%)                                             
      Inflammation, Focal                                                                     1 (1%)       1 (1%)                   
      Epithelium, Atrophy                              9 (9%)      10 (10%)      8 (8%)       7 (7%)       8 (8%)                   
      Epithelium, Hyperplasia                                                    3 (3%)                    1 (1%)                   
      Epithelium, Hyperplasia, Focal                                                          1 (1%)                                

a  Number of animals examined microscopically at site and number of animals with lesion                                             

                                                             Page   13                                                              
NTP Experiment-Test: 89029-06         INCIDENCE RATES OF NONNEOPLASTIC LESIONS BY ANATOMIC SITE (a)               Report: PEIRPT03
Study Type: CHRONIC                                       MAGNETIC FIELDS (EMF)                                   Date: 01/09/98  
Route: MAGNETIC FIELDS                                                                                            Time: 12:39:32  
____________________________________________________________________________________________________________________________________

         B6C3F1 MICE MALE                          SHAM         .02          2 GAUSS      10           10 GAUSS                     
                                                    CONTROL      GAUSS                     GAUSS          INTER                     
____________________________________________________________________________________________________________________________________
                                                                                                                                    
ALIMENTARY SYSTEM - CONT                                                                                                            
      Epithelium, Vacuolization Cytoplasmic                                                                1 (1%)                   
   Stomach, Glandular                                 (94)         (93)         (97)         (87)         (93)                      
      Erosion, Focal                                                             1 (1%)                                             
      Inflammation                                                  3 (3%)       1 (1%)                    1 (1%)                   
      Epithelium, Atrophy                              8 (9%)       9 (10%)      8 (8%)       8 (9%)      10 (11%)                  
      Epithelium, Cyst, Focal                          6 (6%)      10 (11%)     10 (10%)      3 (3%)      11 (12%)                  
      Epithelium, Hyperplasia, Focal                                                          1 (1%)                                
      Epithelium, Mineralization                       1 (1%)                    1 (1%)                                             
      Serosa, Inflammation                                          1 (1%)                                                          
____________________________________________________________________________________________________________________________________
                                                                                                                                    
 CARDIOVASCULAR SYSTEM                                                                                                              
                                                                                                                                    
   Blood Vessel                                       (97)         (94)         (100)        (96)         (98)                      
      Aorta, Mineralization                                                      1 (1%)       1 (1%)                                
   Heart                                              (100)        (100)        (100)        (99)         (100)                     
      Inflammation, Focal                              2 (2%)       1 (1%)       5 (5%)       2 (2%)       2 (2%)                   
      Arteriole, Inflammation                                       1 (1%)                                                          
      Arteriole, Mineralization                                                  1 (1%)                                             
      Artery, Inflammation                             1 (1%)                                              1 (1%)                   
      Artery, Mineralization                           1 (1%)       1 (1%)                                                          
      Atrium, Infiltration Cellular                                                           1 (1%)                                
      Atrium, Thrombosis                               1 (1%)                                                                       
      Capillary, Myocardium, Infiltration Cellular,                                                                                 
           Focal                                                    1 (1%)                                                          
      Epicardium, Mineralization                                                 1 (1%)       1 (1%)                                
      Myocardium, Degeneration                                                   2 (2%)                    2 (2%)                   
      Myocardium, Mineralization                                                                           1 (1%)                   
      Myocardium, Necrosis, Focal                                                1 (1%)                                             
      Valve, Thrombosis                                                                                    2 (2%)                   
____________________________________________________________________________________________________________________________________
                                                                                                                                    
 ENDOCRINE SYSTEM                                                                                                                   
                                                                                                                                    
   Adrenal Cortex                                     (99)         (96)         (99)         (94)         (97)                      
      Bilateral, Mineralization                                                                            1 (1%)                   
      Bilateral, Capsule, Hyperplasia                 55 (56%)     52 (54%)     53 (54%)     50 (53%)     52 (54%)                  
      Bilateral, Capsule, Mineralization               1 (1%)                                 1 (1%)                                
      Bilateral, Zona Fasciculata, Hyperplasia,                                                                                     
           Focal                                       1 (1%)       1 (1%)                                                          
      Bilateral, Zona Fasciculata, Hypertrophy         1 (1%)                    2 (2%)       2 (2%)                                
      Bilateral, Zona Fasciculata, Hypertrophy,                                                                                     
           Focal                                       2 (2%)       3 (3%)       6 (6%)       2 (2%)       3 (3%)                   
      Capsule, Hyperplasia                            31 (31%)     31 (32%)     38 (38%)     31 (33%)     33 (34%)                  
      Zona Fasciculata, Degeneration, Focal                                      1 (1%)                                             
      Zona Fasciculata, Hyperplasia, Focal             3 (3%)       6 (6%)       7 (7%)       2 (2%)       5 (5%)                   
      Zona Fasciculata, Hypertrophy                    8 (8%)      14 (15%)     11 (11%)      7 (7%)       5 (5%)                   

a  Number of animals examined microscopically at site and number of animals with lesion                                             

                                                             Page   14                                                              
NTP Experiment-Test: 89029-06         INCIDENCE RATES OF NONNEOPLASTIC LESIONS BY ANATOMIC SITE (a)               Report: PEIRPT03
Study Type: CHRONIC                                       MAGNETIC FIELDS (EMF)                                   Date: 01/09/98  
Route: MAGNETIC FIELDS                                                                                            Time: 12:39:32  
____________________________________________________________________________________________________________________________________

         B6C3F1 MICE MALE                          SHAM         .02          2 GAUSS      10           10 GAUSS                     
                                                    CONTROL      GAUSS                     GAUSS          INTER                     
____________________________________________________________________________________________________________________________________
                                                                                                                                    
ENDOCRINE SYSTEM - CONT                                                                                                             
      Zona Fasciculata, Hypertrophy, Focal            13 (13%)     17 (18%)     15 (15%)     10 (11%)     16 (16%)                  
      Zona Fasciculata, Infiltration Cellular,                                                                                      
           Polymorphonuclear                                                                  1 (1%)                                
      Zona Fasciculata, Vacuolization Cytoplasmic      2 (2%)                                                                       
      Zona Fasciculata, Vacuolization Cytoplasmic,                                                                                  
           Focal                                       1 (1%)                                                                       
      Zona Glomerulosa, Hyperplasia, Focal             3 (3%)       7 (7%)       4 (4%)       2 (2%)       7 (7%)                   
      Zona Reticularis, Degeneration, Fatty            1 (1%)       1 (1%)                                                          
   Adrenal Medulla                                    (98)         (93)         (99)         (91)         (96)                      
      Angiectasis                                                   1 (1%)                                                          
      Hyperplasia                                                   2 (2%)       3 (3%)       3 (3%)       5 (5%)                   
   Islets, Pancreatic                                 (99)         (99)         (98)         (97)         (98)                      
      Hyperplasia                                     97 (98%)     88 (89%)     84 (86%)     84 (87%)     89 (91%)                  
      Hypertrophy, Focal                                                                      1 (1%)                                
      Infiltration Cellular, Lymphocyte                                                                    1 (1%)                   
      Infiltration Cellular, Histiocyte                                                       1 (1%)       1 (1%)                   
   Parathyroid Gland                                  (66)         (55)         (72)         (65)         (67)                      
      Cyst                                                          1 (2%)       1 (1%)       1 (2%)       2 (3%)                   
      Hyperplasia                                      1 (2%)       2 (4%)       2 (3%)                    1 (1%)                   
      Infiltration Cellular, Lymphocyte                                                                    1 (1%)                   
      Infiltration Cellular, Mixed Cell                1 (2%)                                                                       
   Pituitary Gland                                    (83)         (84)         (82)         (84)         (86)                      
      Pars Distalis, Cyst                              9 (11%)      7 (8%)       6 (7%)       4 (5%)      14 (16%)                  
      Pars Distalis, Hyperplasia, Focal                1 (1%)       2 (2%)       1 (1%)       3 (4%)       1 (1%)                   
      Pars Nervosa, Cyst                                                                                   1 (1%)                   
   Thyroid Gland                                      (99)         (98)         (98)         (97)         (98)                      
      Bilateral, Follicle, Cyst                                                               1 (1%)                                
      Follicle, Cyst                                   5 (5%)      13 (13%)      7 (7%)       7 (7%)       9 (9%)                   
____________________________________________________________________________________________________________________________________
                                                                                                                                    
 GENERAL BODY SYSTEM                                                                                                                
                                                                                                                                    
   Tissue NOS                                         (2)          (4)          (1)          (1)                                    
      Inflammation, Acute                                           1 (25%)                                                         
      Abdominal, Fat, Necrosis                         1 (50%)                                                                      
____________________________________________________________________________________________________________________________________
                                                                                                                                    
 GENITAL SYSTEM                                                                                                                     
                                                                                                                                    
   Coagulating Gland                                  (2)                       (2)          (1)                                    
      Cyst                                             1 (50%)                   1 (50%)      1 (100%)                              
      Bilateral, Cyst                                  1 (50%)                                                                      
   Epididymis                                         (98)         (99)         (99)         (96)         (98)                      
      Cyst                                                                                    1 (1%)                                
      Granuloma Sperm                                  2 (2%)       2 (2%)       1 (1%)       2 (2%)                                
      Hyperplasia                                                                1 (1%)                                             
      Infiltration Cellular, Lymphocyte               13 (13%)      9 (9%)      16 (16%)     14 (15%)     15 (15%)                  

a  Number of animals examined microscopically at site and number of animals with lesion                                             

                                                             Page   15                                                              
NTP Experiment-Test: 89029-06         INCIDENCE RATES OF NONNEOPLASTIC LESIONS BY ANATOMIC SITE (a)               Report: PEIRPT03
Study Type: CHRONIC                                       MAGNETIC FIELDS (EMF)                                   Date: 01/09/98  
Route: MAGNETIC FIELDS                                                                                            Time: 12:39:32  
____________________________________________________________________________________________________________________________________

         B6C3F1 MICE MALE                          SHAM         .02          2 GAUSS      10           10 GAUSS                     
                                                    CONTROL      GAUSS                     GAUSS          INTER                     
____________________________________________________________________________________________________________________________________
                                                                                                                                    
GENITAL SYSTEM - CONT                                                                                                               
      Inflammation                                                                                         2 (2%)                   
      Inflammation, Granulomatous                                   1 (1%)                                                          
      Spermatocele                                     2 (2%)                    3 (3%)       7 (7%)       6 (6%)                   
      Bilateral, Atrophy                                            1 (1%)                                                          
      Bilateral, Granuloma Sperm                                    1 (1%)       1 (1%)                                             
      Bilateral, Infiltration Cellular, Lymphocyte    11 (11%)      2 (2%)       5 (5%)       4 (4%)       9 (9%)                   
   Preputial Gland                                    (98)         (98)         (100)        (95)         (99)                      
      Atrophy                                          8 (8%)      22 (22%)     15 (15%)     10 (11%)     18 (18%)                  
      Cyst                                            29 (30%)     13 (13%)      7 (7%)      23 (24%)     17 (17%)                  
      Infiltration Cellular, Lymphocyte                             1 (1%)                    1 (1%)                                
      Inflammation                                    15 (15%)     18 (18%)     33 (33%)     27 (28%)     34 (34%)                  
      Bilateral, Atrophy                              17 (17%)     34 (35%)     34 (34%)     27 (28%)     38 (38%)                  
      Bilateral, Cyst                                 55 (56%)     75 (77%)     86 (86%)     53 (56%)     72 (73%)                  
      Bilateral, Inflammation                         31 (32%)     19 (19%)     23 (23%)     26 (27%)     27 (27%)                  
      Bilateral, Mineralization                                     1 (1%)                                                          
   Prostate                                           (98)         (92)         (94)         (94)         (92)                      
      Atrophy                                                       1 (1%)                                                          
      Infiltration Cellular, Lymphocyte                2 (2%)       4 (4%)       4 (4%)       2 (2%)       6 (7%)                   
      Inflammation                                                  1 (1%)                                 1 (1%)                   
      Epithelium, Hyperplasia                         49 (50%)     52 (57%)     56 (60%)     47 (50%)     45 (49%)                  
   Seminal Vesicle                                    (99)         (97)         (98)         (98)         (98)                      
      Atrophy                                                                                 2 (2%)       1 (1%)                   
      Cyst                                            28 (28%)     22 (23%)     23 (23%)     19 (19%)     16 (16%)                  
      Infiltration Cellular, Lymphocyte                1 (1%)                                                                       
      Inflammation                                     2 (2%)                    2 (2%)                                             
      Bilateral, Atrophy                                                         1 (1%)       1 (1%)                                
      Bilateral, Cyst                                 52 (53%)     41 (42%)     36 (37%)     49 (50%)     42 (43%)                  
      Bilateral, Inflammation                                       1 (1%)                                                          
   Testes                                             (99)         (98)         (100)        (96)         (98)                      
      Atrophy                                          3 (3%)       3 (3%)       1 (1%)       2 (2%)       1 (1%)                   
      Hemorrhage, Focal                                                                                    1 (1%)                   
      Mineralization                                                1 (1%)       1 (1%)                    1 (1%)                   
      Necrosis                                                                   1 (1%)                                             
      Bilateral, Atrophy                                            2 (2%)                    6 (6%)       1 (1%)                   
      Interstitial Cell, Hyperplasia, Focal                                                   1 (1%)                                
      Tunic, Inflammation                                                                                  1 (1%)                   
      Tunic, Mineralization                            1 (1%)       1 (1%)                                 1 (1%)                   
      Tunic, Mineralization, Focal                                               1 (1%)                                             
____________________________________________________________________________________________________________________________________
                                                                                                                                    
 HEMATOPOIETIC SYSTEM                                                                                                               
                                                                                                                                    
   Bone Marrow                                        (99)         (99)         (99)         (99)         (100)                     
      Atrophy                                                       1 (1%)       1 (1%)                    3 (3%)                   
      Fibrosis                                                                                             1 (1%)                   
      Hyperplasia                                     33 (33%)     30 (30%)     28 (28%)     30 (30%)     25 (25%)                  
      Infiltration Cellular, Focal, Lymphocyte         3 (3%)       1 (1%)       2 (2%)                    2 (2%)                   

a  Number of animals examined microscopically at site and number of animals with lesion                                             

                                                             Page   16                                                              
NTP Experiment-Test: 89029-06         INCIDENCE RATES OF NONNEOPLASTIC LESIONS BY ANATOMIC SITE (a)               Report: PEIRPT03
Study Type: CHRONIC                                       MAGNETIC FIELDS (EMF)                                   Date: 01/09/98  
Route: MAGNETIC FIELDS                                                                                            Time: 12:39:32  
____________________________________________________________________________________________________________________________________

         B6C3F1 MICE MALE                          SHAM         .02          2 GAUSS      10           10 GAUSS                     
                                                    CONTROL      GAUSS                     GAUSS          INTER                     
____________________________________________________________________________________________________________________________________
                                                                                                                                    
HEMATOPOIETIC SYSTEM - CONT                                                                                                         
      Myelofibrosis                                                 1 (1%)       2 (2%)                    2 (2%)                   
      Necrosis                                                                                             1 (1%)                   
      Thrombosis                                                                              1 (1%)                                
      Erythroid Cell, Atrophy                          1 (1%)                                                                       
      Myeloid Cell, Hyperplasia                        2 (2%)       3 (3%)                    5 (5%)                                
   Lymph Node                                         (6)          (6)          (5)          (3)          (7)                       
      Inflammation, Focal                              1 (17%)                                                                      
      Inguinal, Hemorrhage                                                       1 (20%)                                            
      Inguinal, Hyperplasia                                                      1 (20%)                                            
      Inguinal, Necrosis                                                         1 (20%)                                            
      Lumbar, Hemorrhage                               1 (17%)                                                                      
      Lumbar, Hyperplasia                                                                                  1 (14%)                  
      Lumbar, Infiltration Cellular, Plasma Cell                    1 (17%)                                                         
   Lymph Node, Mandibular                             (92)         (92)         (92)         (89)         (90)                      
      Atrophy                                          4 (4%)       2 (2%)       3 (3%)       4 (4%)       1 (1%)                   
      Hemorrhage                                                                              1 (1%)       1 (1%)                   
      Hyperplasia                                      1 (1%)       4 (4%)       1 (1%)       1 (1%)       3 (3%)                   
      Infiltration Cellular, Mast Cell                 1 (1%)                    1 (1%)       7 (8%)       2 (2%)                   
      Infiltration Cellular, Plasma Cell                            2 (2%)       3 (3%)       2 (2%)       1 (1%)                   
      Infiltration Cellular, Polymorphonuclear                                                1 (1%)                                
      Infiltration Cellular, Histiocyte                                          1 (1%)                    3 (3%)                   
      Infiltration Cellular, Mixed Cell                4 (4%)       2 (2%)                    3 (3%)       1 (1%)                   
      Necrosis                                                      1 (1%)                                                          
      Pigmentation                                     2 (2%)       4 (4%)       3 (3%)       2 (2%)       4 (4%)                   
   Lymph Node, Mesenteric                             (87)         (90)         (96)         (85)         (92)                      
      Atrophy                                          6 (7%)      12 (13%)     14 (15%)      7 (8%)      12 (13%)                  
      Hematopoietic Cell Proliferation                                           1 (1%)                                             
      Hemorrhage                                       3 (3%)       2 (2%)       3 (3%)       3 (4%)       5 (5%)                   
      Hyperplasia                                                   7 (8%)       5 (5%)       1 (1%)       3 (3%)                   
      Infiltration Cellular, Plasma Cell                                                                   1 (1%)                   
      Infiltration Cellular, Lymphocyte                             1 (1%)       1 (1%)                                             
      Infiltration Cellular, Histiocyte               59 (68%)     67 (74%)     79 (82%)     56 (66%)     72 (78%)                  
      Infiltration Cellular, Mixed Cell                3 (3%)       5 (6%)       2 (2%)       3 (4%)       6 (7%)                   
      Necrosis                                         1 (1%)                                                                       
      Pigmentation                                                                                         1 (1%)                   
      Artery, Inflammation                             1 (1%)                                                                       
   Spleen                                             (99)         (98)         (98)         (93)         (98)                      
      Hematopoietic Cell Proliferation                37 (37%)     43 (44%)     52 (53%)     36 (39%)     48 (49%)                  
      Pigmentation                                                  1 (1%)                                 1 (1%)                   
      Capsule, Degeneration, Focal                                                            1 (1%)                                
      Lymphoid Follicle, Atrophy                      11 (11%)     12 (12%)      8 (8%)      14 (15%)      8 (8%)                   
      Lymphoid Follicle, Hyperplasia                  21 (21%)     27 (28%)     17 (17%)     13 (14%)     19 (19%)                  
      Red Pulp, Atrophy                                             4 (4%)       3 (3%)       4 (4%)       4 (4%)                   
      Red Pulp, Pigmentation                                                                  1 (1%)                                
   Thymus                                             (69)         (68)         (63)         (68)         (60)                      
      Atrophy                                         62 (90%)     50 (74%)     47 (75%)     64 (94%)     44 (73%)                  
      Cyst, Focal                                      4 (6%)      10 (15%)      9 (14%)      4 (6%)       5 (8%)                   

a  Number of animals examined microscopically at site and number of animals with lesion                                             

                                                             Page   17                                                              
NTP Experiment-Test: 89029-06         INCIDENCE RATES OF NONNEOPLASTIC LESIONS BY ANATOMIC SITE (a)               Report: PEIRPT03
Study Type: CHRONIC                                       MAGNETIC FIELDS (EMF)                                   Date: 01/09/98  
Route: MAGNETIC FIELDS                                                                                            Time: 12:39:32  
____________________________________________________________________________________________________________________________________

         B6C3F1 MICE MALE                          SHAM         .02          2 GAUSS      10           10 GAUSS                     
                                                    CONTROL      GAUSS                     GAUSS          INTER                     
____________________________________________________________________________________________________________________________________
                                                                                                                                    
HEMATOPOIETIC SYSTEM - CONT                                                                                                         
      Hemorrhage                                       1 (1%)                    1 (2%)                                             
      Hyperplasia, Lymphoid                            3 (4%)       5 (7%)       9 (14%)                   5 (8%)                   
____________________________________________________________________________________________________________________________________
                                                                                                                                    
 INTEGUMENTARY SYSTEM                                                                                                               
                                                                                                                                    
   Mammary Gland                                      (2)          (1)          (3)          (4)          (1)                       
      Hyperplasia                                                                1 (33%)                                            
      Duct, Dilatation                                                                        1 (25%)                               
   Skin                                               (99)         (99)         (100)        (100)        (100)                     
      Cyst                                                                       1 (1%)       1 (1%)                                
      Inflammation                                     1 (1%)       1 (1%)       1 (1%)                    1 (1%)                   
      Ulcer, Focal                                                  1 (1%)                    1 (1%)       1 (1%)                   
____________________________________________________________________________________________________________________________________
                                                                                                                                    
 MUSCULOSKELETAL SYSTEM                                                                                                             
                                                                                                                                    
   Bone                                               (97)         (100)        (99)         (99)         (99)                      
      Cartilage, Epiphysis, Femur, Cyst                                          1 (1%)                                             
      Cartilage, Epiphysis, Femur, Cyst, Multiple                                1 (1%)                                             
      Femur, Fibrous Osteodystrophy                                              1 (1%)                                             
      Vertebra, Inflammation                                                     1 (1%)                                             
____________________________________________________________________________________________________________________________________
                                                                                                                                    
 NERVOUS SYSTEM                                                                                                                     
                                                                                                                                    
   Brain                                              (100)        (99)         (100)        (99)         (100)                     
      Hydrocephalus                                                 1 (1%)                                                          
      Cerebellum, Developmental Malformation                                                               1 (1%)                   
      Cerebellum, Hemorrhage                                                                  1 (1%)                                
      Cerebrum, Vacuolization Cytoplasmic, Focal                    1 (1%)                                                          
      Thalamus, Mineralization                        70 (70%)     68 (69%)     60 (60%)     78 (79%)     63 (63%)                  
      Thalamus, Vacuolization Cytoplasmic, Focal                                                           1 (1%)                   
   Peripheral Nerve                                   (7)          (8)          (2)          (6)          (3)                       
      Sciatic, Degeneration                                         1 (13%)                                                         
____________________________________________________________________________________________________________________________________
                                                                                                                                    
 RESPIRATORY SYSTEM                                                                                                                 
                                                                                                                                    
   Lung                                               (100)        (99)         (100)        (99)         (99)                      
      Congestion                                                    1 (1%)       2 (2%)                                             
      Infiltration Cellular, Lymphocyte               21 (21%)     16 (16%)     22 (22%)     24 (24%)     16 (16%)                  
      Inflammation, Focal                                           3 (3%)       1 (1%)       3 (3%)       2 (2%)                   
      Mineralization, Focal                                                                                1 (1%)                   
      Alveolar Epithelium, Hyperplasia, Focal          2 (2%)       2 (2%)                    3 (3%)       2 (2%)                   
      Alveolus, Infiltration Cellular, Histiocyte      3 (3%)       5 (5%)       4 (4%)       3 (3%)       9 (9%)                   
      Arteriole, Thrombosis                            1 (1%)       1 (1%)                                                          

a  Number of animals examined microscopically at site and number of animals with lesion                                             

                                                             Page   18                                                              
NTP Experiment-Test: 89029-06         INCIDENCE RATES OF NONNEOPLASTIC LESIONS BY ANATOMIC SITE (a)               Report: PEIRPT03
Study Type: CHRONIC                                       MAGNETIC FIELDS (EMF)                                   Date: 01/09/98  
Route: MAGNETIC FIELDS                                                                                            Time: 12:39:32  
____________________________________________________________________________________________________________________________________

         B6C3F1 MICE MALE                          SHAM         .02          2 GAUSS      10           10 GAUSS                     
                                                    CONTROL      GAUSS                     GAUSS          INTER                     
____________________________________________________________________________________________________________________________________
                                                                                                                                    
RESPIRATORY SYSTEM - CONT                                                                                                           
      Serosa, Inflammation                                                                                 1 (1%)                   
   Nose                                               (99)         (99)         (100)        (97)         (100)                     
      Inflammation                                     1 (1%)       2 (2%)       3 (3%)       2 (2%)       7 (7%)                   
      Sinus, Inflammation                                           1 (1%)                                 1 (1%)                   
____________________________________________________________________________________________________________________________________
                                                                                                                                    
 SPECIAL SENSES SYSTEM                                                                                                              
                                                                                                                                    
   Eye                                                             (2)                       (2)          (1)                       
      Atrophy                                                       1 (50%)                                                         
      Cornea, Inflammation                                          1 (50%)                                                         
   Harderian Gland                                    (99)         (99)         (100)        (96)         (99)                      
      Atrophy, Focal                                                1 (1%)       1 (1%)                                             
      Infiltration Cellular, Lymphocyte                8 (8%)      11 (11%)     10 (10%)      4 (4%)       9 (9%)                   
      Inflammation                                                                            1 (1%)                                
      Inflammation, Focal                              1 (1%)                                 1 (1%)       1 (1%)                   
      Necrosis, Focal                                                                         1 (1%)                                
      Bilateral, Infiltration Cellular, Lymphocyte     3 (3%)       2 (2%)       6 (6%)       5 (5%)       5 (5%)                   
      Epithelium, Hypertrophy, Focal                   1 (1%)                                                                       
____________________________________________________________________________________________________________________________________
                                                                                                                                    
 URINARY SYSTEM                                                                                                                     
                                                                                                                                    
   Kidney                                             (99)         (98)         (99)         (96)         (97)                      
      Hydronephrosis                                   1 (1%)                    1 (1%)                                             
      Infarct, Focal                                   1 (1%)       3 (3%)       1 (1%)                    1 (1%)                   
      Infiltration Cellular, Lymphocyte                1 (1%)                    1 (1%)                                             
      Arteriole, Inflammation                          1 (1%)                                                                       
      Artery, Inflammation                                          1 (1%)                                                          
      Bilateral, Hydronephrosis                                     1 (1%)       2 (2%)                                             
      Bilateral, Infarct, Focal                                                  1 (1%)                                             
      Bilateral, Artery, Inflammation                  1 (1%)       1 (1%)                                                          
      Bilateral, Capsule, Mineralization               1 (1%)                                                                       
      Bilateral, Cortex, Congestion                    2 (2%)                    2 (2%)                                             
      Bilateral, Cortex, Cyst                          4 (4%)       7 (7%)       6 (6%)       6 (6%)       2 (2%)                   
      Bilateral, Cortex, Infiltration Cellular,                                                                                     
           Lymphocyte                                 10 (10%)      8 (8%)       8 (8%)      10 (10%)     19 (20%)                  
      Bilateral, Cortex, Inflammation                                                                      1 (1%)                   
      Bilateral, Cortex, Mineralization               79 (80%)     78 (80%)     77 (78%)     66 (69%)     74 (76%)                  
      Bilateral, Cortex, Renal Tubule, Degeneration   72 (73%)     75 (77%)     76 (77%)     57 (59%)     71 (73%)                  
      Bilateral, Cortex, Renal Tubule, Dilatation      2 (2%)       1 (1%)       1 (1%)       5 (5%)       2 (2%)                   
      Bilateral, Cortex, Renal Tubule, Pigmentation                 1 (1%)       2 (2%)       2 (2%)       1 (1%)                   
      Bilateral, Medulla, Infiltration Cellular,                                                                                    
           Lymphocyte                                 34 (34%)     26 (27%)     37 (37%)     26 (27%)     38 (39%)                  
      Bilateral, Medulla, Inflammation                 1 (1%)                                 1 (1%)                                
      Bilateral, Medulla, Mineralization               1 (1%)                                              1 (1%)                   
      Bilateral, Papilla, Necrosis                                                                         1 (1%)                   

a  Number of animals examined microscopically at site and number of animals with lesion                                             

                                                             Page   19                                                              
NTP Experiment-Test: 89029-06         INCIDENCE RATES OF NONNEOPLASTIC LESIONS BY ANATOMIC SITE (a)               Report: PEIRPT03
Study Type: CHRONIC                                       MAGNETIC FIELDS (EMF)                                   Date: 01/09/98  
Route: MAGNETIC FIELDS                                                                                            Time: 12:39:32  
____________________________________________________________________________________________________________________________________

         B6C3F1 MICE MALE                          SHAM         .02          2 GAUSS      10           10 GAUSS                     
                                                    CONTROL      GAUSS                     GAUSS          INTER                     
____________________________________________________________________________________________________________________________________
                                                                                                                                    
URINARY SYSTEM - CONT                                                                                                               
      Cortex, Cyst                                    19 (19%)     23 (23%)     21 (21%)     11 (11%)     20 (21%)                  
      Cortex, Degeneration, Focal                      1 (1%)                                              1 (1%)                   
      Cortex, Infiltration Cellular, Focal, Mixed                                                                                   
          Cell                                                      1 (1%)                                                          
      Cortex, Infiltration Cellular, Lymphocyte        9 (9%)      10 (10%)     13 (13%)      6 (6%)      18 (19%)                  
      Cortex, Inflammation                                          1 (1%)                    2 (2%)                                
      Cortex, Metaplasia, Focal, Osseous               4 (4%)       4 (4%)       8 (8%)       2 (2%)       4 (4%)                   
      Cortex, Mineralization                                                     1 (1%)                    3 (3%)                   
      Cortex, Renal Tubule, Degeneration               4 (4%)       2 (2%)       2 (2%)       1 (1%)       1 (1%)                   
      Cortex, Renal Tubule, Dilatation                 1 (1%)                    2 (2%)                                             
      Glomerulus, Inflammation, Focal                                                                      1 (1%)                   
      Medulla, Infiltration Cellular, Lymphocyte      21 (21%)     14 (14%)     19 (19%)     15 (16%)      9 (9%)                   
      Medulla, Inflammation                                         1 (1%)       1 (1%)                                             
      Medulla, Mineralization                                                                              1 (1%)                   
   Urethra                                                                                                (1)                       
      Cyst                                                                                                 1 (100%)                 
   Urinary Bladder                                    (98)         (95)         (95)         (93)         (94)                      
      Hemorrhage                                                                                           1 (1%)                   
      Infiltration Cellular, Lymphocyte                4 (4%)       1 (1%)       1 (1%)                    4 (4%)                   
      Inflammation                                                  1 (1%)                    1 (1%)                                
      Artery, Inflammation                             1 (1%)                                                                       
      Transitional Epithelium, Hyperplasia                          1 (1%)                                                          
                                                                                                                                    

a  Number of animals examined microscopically at site and number of animals with lesion                                             

                                                             Page   20                                                              
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                             ----------              END OF REPORT             ----------                                           
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