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特許 権利維持 Melatonin (Listeni/ˌmɛləˈtoʊnɪn/), chemically N-acetyl-5-methoxy tryptamine,[1] is a substance found in animals, plants, fungi and bacteria. In most of these organisms, except for animals, its function is something other than daily organization. In animals it is a hormone that anticipates the daily onset of darkness.