| melatonin | <hormone> A hormone secreted by the pineal gland. In lower vertebrates causes aggregation of pigment in melanophores and thus lightens skin. In humans believed to play a role in establishment of circadian rhythms. (13 Nov 1997) |
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| melatonin deacetylase | <enzyme> Enzyme from various vertebrate ocular tissues converts melatonin to 5-hydroxytryptamine Registry number: EC 3.5.1.- (26 Jun 1999) |