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Over three centuries ago, the French philosopher Rene Descartes described the pineal gland as t he seat of the soul. However, it was not until the late 1950s that the chemical identity and biosynthesis of melatonin, the principal hormone secreted by the pineal body, were revealed. Melatonin, named from the Greek melanos, meaning black, and tonos, meaning color, is a biogenic amine...
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