这个词是什么意思？
A biogenic amine that is found in animals and plants. In mammals, melatonin is produced by the PINEAL GLAND. Its secretion increases in darkness and decreases during exposure to light. Melatonin is implicated in the regulation of SLEEP, mood, and REPRODUCTION. Melatonin is also an effective antioxidant.
中文名称索引；定义为 MeSH 英文原文，尚未逐条译审。MESH:D008550 · MeSH 2026。
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