The Liver.- Anatomy, Histology, and Ultrastructure.- Embryology, Anatomy, Histology, and Ultrastructure of the Liver, Rat.- Neoplasms.- Foci of Altered Hepatocytes, Rat.- Histochemical Characteristics of Foci Induced by Diethylnitrosamine, Liver, Mouse.- Hepatocellular Carcinoma, Liver, Rat.- Hepatocellular Adenoma, Liver, Rat.- Cholangiofibroma and Cholangiocarcinoma, Liver, Rat.- Cholangioma, Liver, Rat.- Hemangiosarcoma, Liver, Rat.- Hemangioma, Liver, Rat.- Kupffer's Cell Sarcoma, Liver, Rat.- Focal Carcinoma in Hepatocellular Adenoma, Liver, Mouse.- Hyperplasia, Adenoma, Gallbladder, Hamster.- Nonneoplastic Lesions.- Polyploidy, Liver, Rat.- Intranuclear and Intracytoplasmic Inclusions, Liver, Rat.- Intranuclear and Intracytoplasmic Inclusions in Normal and Neoplastic Hepatocytes, Mouse.- Extramedullary Hematopoiesis, Liver, Rat.- Nutritional Fatty Liver and Cirrhosis, Rat, Mouse.- Cirrhosis, Mouse.- Peliosis Hepatis, Rodents.- Spongiosis Hepatis, Rat.- Hyperplasia, Diffuse, Following Partial Hepatectomy, Mouse.- Oval Cell Hyperplasia, Liver, Mouse, Rat.- Herniation of Liver Through Esophageal Hiatus, Rat.- Viral Infections.- K Virus Infection, Liver, Mouse.- Mouse Hepatitis Virus Infection, Liver, Mouse.- Rat Parvovirus Infection, Liver.- Mousepox, Liver, Mouse.- Reovirus Type 3 Infection, Liver, Mouse.- Bacterial Infections.- Tyzzer's Disease, Liver, Mouse, Rat, Hamster.- Corynebacterium Kutscheri Infection, Liver, Mouse and Rat.- Salmonellosis, Liver, Mouse, Rat, Hamster.- The Salivary Glands.- Histology and Ultrastructure, Salivary Glands, Mouse.- Neoplasms.- Myoepithelioma, Salivary Glands, Mouse.- Adenoma, Adenocarcinoma, Salivary Gland, Mouse.- Polyoma Virus Infection, Salivary Glands, Mouse.- Nonneoplastic Lesions.- Cytomegalovirus Infection, SalivaryGlands, Mouse, Rat, Hamster.- Sialodacryoadenitis (SDA) Infection, Rat.- The Exocrine Pancreas.- Histology and Ultrastructure.- Embryology, Histology, and Ultrastructure of the Exocrine Pancreas.- Neoplasms.- Acinar-Cell Carcinoma, Pancreas, Rat.- Experimental Carcinogenesis of Exocrine Pancreas: Animal Models, Neoplasms, and Current Understanding of Pathogenesis.- Nonneoplastic Lesions.- Atrophy, Exocrine Pancreas, Rat.- Exocrine Pancreas of Hypophysectomized Rats.- Necrotizing Pancreatitis Induced by 4-HAQO, Rat.- The Gastrointestinal Tract.- 1. Oral Cavity.- Squamous Cell Carcinoma, Tongue, Rat.- 2. Esophagus.- Neoplasms.- Squamous Cell Papilloma, Esophagus, Rat.- Carcinoma In Situ, Esophagus, Rat.- Squamous Cell Carcinoma, Esophagus, Rat.- Papilloma and Squamous Cell Carcinoma, Esophagus, Rat (Zinc Deficiency, Alcohol, and Methylbenzylnitrosamine).- 3. Stomach.- Anatomy, Histology, Ultrastructure, Stomach, Rat.- Neoplasms.- Papilloma, Forestomach, Rat.- Squamous Cell Carcinoma, Forestomach, Rat.- Adenoma, Stomach, Rat.- Adenocarcinoma, Glandular Stomach, Rat.- Leiomyoma and Leiomyosarcoma, Stomach, Rat.- 4. Small Intestines.- Viral Infections.- Mouse Hepatitis Virus Infection, Intestine, Mouse.- Murine Rotavirus Infection, Intestine, Mouse.- Adenovirus Infection, Intestine, Mouse.- K Virus Infection, Intestine, Mouse.- Bacterial Infections.- Tyzzer's Disease, Intestine, Mouse, Rat, Hamster.- Salmonellosis, Intestine, Mouse, Rat, Hamster.- Citrobacter freundii Infection, Colon, Mouse.- Clostridial Enteropathies, Hamster.- Transmissible Ileal Hyperplasia, Hamster.- Helminth and Protozoal Infections.- Spironucleus Muris Infection, Intestine, Mouse, Rat, Hamster.- Giardia Muris Infection, Intestine, Mouse, Rat, Hamster.- 5. Large Intestine.- Neoplasms.-Adenocarcinoma, Colon and Rectum, Rat.