title: Morning injections of large doses of melatonin, but not of 5-methoxytryptamine, prevent in the hamster the antigonadotropic effect of 5-methoxytryptamine administered late in the afternoon.
mesh_terms: D008735:5-Methoxytryptamine / Q000008:administration & dosage* / Q000037:antagonists & inhibitors / Q000378:metabolism; D000818:Animals; D006224:Cricetinae; D008027:Light; D008297:Male; D008550:Melatonin / Q000008:administration & dosage*; D008647:Mesocricetus; D009929:Organ Size / Q000187:drug effects; D011956:Receptors, Cell Surface / Q000187:drug effects; D044094:Receptors, Melatonin; D013737:Testis / Q000187:drug effects*; D013997:Time Factors; D014363:Tryptamines / Q000008:administration & dosage*
chemical_list: D011956:Receptors, Cell Surface; D044094:Receptors, Melatonin; D014363:Tryptamines; D008735:5-Methoxytryptamine; D008550:Melatonin