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特許 係属中 Melatonin (Listeni/ˌmɛləˈtoʊnɪn/), chemically N-acetyl-5-methoxy tryptamine,[1] is a hormone found in animals, plants, fungi and bacteria in anticipation of the daily onset of darkness.[2] It is synthesized in animal cells directly from the amino acid tryptophan, but in other organisms through the Shikimic acid pathway.