Word: melatonin
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Dates: during 1980-1989
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...than two-thirds of those with the syndrome have a close relative with a mood disorder. Also baffling is the exact role that the absence or presence of light plays in seasonal mood shifts. Among the theories: a disturbance in the body's natural clock and abnormal production of melatonin, a hormone manufactured in the brain, and serotonin, a chemical that helps transmit nerve impulses...