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    Melatonin (CAS NO.73-31-4) is related to the mechanism by which some amphibians and reptiles change the color of their skin and, indeed, it was in this connection the substance first was discovered. McCord and Allen discovered (J Exptl Zool, 1917) that extract of the pineal glands of cows lightened frog skin, while Aaron B. Lerner is credited ...

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