title: Melatonin prevents refratoriness to short days in male hamsters.
mesh_terms: D000818:Animals; D001683:Biological Clocks / Q000187:drug effects*; D006224:Cricetinae; D004780:Environment, Controlled; D008027:Light; D008297:Male; D008550:Melatonin / Q000494:pharmacology*; D008647:Mesocricetus; D009929:Organ Size / Q000187:drug effects; D012621:Seasons; D013737:Testis / Q000033:anatomy & histology / Q000187:drug effects* / Q000502:physiology
chemical_list: D008550:Melatonin