这个词是什么意思？
An essential amino acid that is necessary for normal growth in infants and for NITROGEN balance in adults. It is a precursor of INDOLE ALKALOIDS in plants. It is a precursor of SEROTONIN (hence its use as an antidepressant and sleep aid). It can be a precursor to NIACIN, albeit inefficiently, in mammals.
中文名称索引；定义为 MeSH 英文原文，尚未逐条译审。MESH:D014364 · MeSH 2026。
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