title: Diurnal oscillations in pineal melatonin content.
mesh_terms: D000818:Animals; D001681:Biological Assay; D001717:Birds; D002645:Chickens; D002940:Circadian Rhythm; D003624:Darkness; D008027:Light; D008550:Melatonin / Q000032:analysis*; D010870:Pineal Gland / Q000032:analysis*; D051381:Rats
chemical_list: D008550:Melatonin