title: Diurnal changes in pineal melatonin content in four rodent species: relationship to photoperiodism.
mesh_terms: D000818:Animals; D002940:Circadian Rhythm; D006224:Cricetinae / Q000378:metabolism*; D005260:Female; D008027:Light; D008297:Male; D008550:Melatonin / Q000378:metabolism* / Q000494:pharmacology; D010053:Ovary / Q000187:drug effects; D010870:Pineal Gland / Q000378:metabolism*; D051381:Rats / Q000378:metabolism*; D013045:Species Specificity; D013737:Testis / Q000187:drug effects
chemical_list: D008550:Melatonin