title: Photoperiodic inhibition of the reproductive system: a prerequisite for the induction of the refractory period in hamsters.
mesh_terms: D000818:Animals; D006224:Cricetinae; D008027:Light; D008297:Male; D008550:Melatonin / Q000494:pharmacology*; D008647:Mesocricetus; D009929:Organ Size / Q000187:drug effects; D010507:Periodicity; D013737:Testis / Q000033:anatomy & histology / Q000187:drug effects / Q000502:physiology*
chemical_list: D008550:Melatonin