Melatonin as a hormone in humans: a history.
This article describes the history of melatonin's transformation, in the perception of the biomedical community, from a skin-lightening agent in amphibians to a hormone in mammals, which may also exert important behavioral--and physiological--effects in humans.
D000818:Animals; D049673:History, 20th Century; D006801:Humans; D008027:Light; D008550:Melatonin / Q000266:history / Q000502:physiology*; D010870:Pineal Gland / Q000502:physiology* / Q000528:radiation effects; D051381:Rats
D008550:Melatonin