\mˈɛlɐtˌɒnɪn], \mˈɛlɐtˌɒnɪn], \m_ˈɛ_l_ɐ_t_ˌɒ_n_ɪ_n]\
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A neurohormone synthesized by the pineal gland in mammals and by lower plants. Production peaks at night and secretion increases during exposure to light. In humans, it is implicated in the regulation of sleep, mood, puberty, and ovarian cycles. Evidence shows that melatonin is a highly effective free radical scavenger and antioxidant both in vivo and in vitro.
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