title: Effect of morning and evening injections of melatonin on the testis of toad (Bufo melanostictus).
mesh_terms: D000818:Animals; D002025:Bufonidae; D008297:Male; D008550:Melatonin / Q000494:pharmacology*; D013091:Spermatogenesis / Q000187:drug effects; D013737:Testis / Q000187:drug effects*; D013997:Time Factors
chemical_list: D008550:Melatonin