melatonin ( synonym found)
Definition of melatonin:

°A hormone, related to serotonin, that is secreted by the pineal gland, and stimulates colour change in the skin of reptiles, and is involved in the sleep/wake and reproductive cycles in mammals.
°Any material similar in its chemistry and effect to the natural hormone.
Definition of melatonin:

°A hormone, related to serotonin, that is secreted by the pineal gland, and stimulates colour change in the skin of reptiles, and is involved in the sleep/wake and reproductive cycles in mammals.
°Any material similar in its chemistry and effect to the natural hormone.
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