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褪黑激素 tuì hēi jīsù
repr.biol. ML
sport., med. melatonin
褪黑激素由松果体产生，色氨酸合成，是哺乳动物的一种神经激素。它能使两栖类的皮肤黑色素凝集，肤色变浅，故得名 tuì hēi jīsù
anim.husb. melatonin

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