The pineal gland and gonadal development in male rats and hamsters.
D000818:Animals; D006224:Cricetinae; D003624:Darkness; D008027:Light; D008297:Male; D010870:Pineal Gland / Q000502:physiology*; D051381:Rats; D013094:Spermatozoa; D013737:Testis / Q000166:cytology / Q000254:growth & development*