这个词是什么意思？
A non-essential amino acid that occurs in high levels in its free state in plasma. It is produced from pyruvate by transamination. It is involved in sugar and acid metabolism, increases IMMUNITY, and provides energy for muscle tissue, BRAIN, and the CENTRAL NERVOUS SYSTEM.
中文名称索引；定义为 MeSH 英文原文，尚未逐条译审。MESH:D000409 · MeSH 2026。
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