title: Photoperiod: its importance as an impeller of pineal and seasonal reproductive rhythms.
mesh_terms: D000818:Animals; D006224:Cricetinae; D005260:Female; D008027:Light; D008297:Male; D008322:Mammals / Q000502:physiology*; D008550:Melatonin / Q000502:physiology*; D008647:Mesocricetus / Q000502:physiology; D010870:Pineal Gland / Q000502:physiology*; D012098:Reproduction; D012621:Seasons
chemical_list: D008550:Melatonin