[Pineal organ].
D000663:Amphibians; D000818:Animals; D001717:Birds; D005399:Fishes; D008027:Light; D008550:Melatonin / Q000378:metabolism; D051379:Mice; D010870:Pineal Gland / Q000502:physiology*; D051381:Rats; D012104:Reptiles
D008550:Melatonin