Glutathione Peroxidase/metabolism; Nafenopin/pharmacology; Neoplasm Proteins; Nerve Tissue Proteins; Selenium/metabolism; Animals; Blotting, Northern; Body Weight/drug effects; Carrier Proteins/metabolism; Fatty Acid-Binding Protein 7; Fatty Acid-Binding Proteins; Kidney/chemistry; Kidney/drug effects; Kidney/metabolism; Liver/chemistry; Liver/drug effects; Liver/metabolism; Male; Mice; Mice, Inbred Strains; Microbodies/drug effects; Microbodies/metabolism; Myelin P2 Protein/metabolism; Organ Size/drug effects; Oxidation-Reduction; Proteins/metabolism; RNA, Messenger/metabolism; Testis/chemistry; Testis/drug effects; Testis/metabolism