这个词是什么意思？
An eleven-amino acid neurotransmitter that appears in both the central and peripheral nervous systems. It is involved in transmission of PAIN, causes rapid contractions of the gastrointestinal smooth muscle, and modulates inflammatory and immune responses.
中文名称索引；定义为 MeSH 英文原文，尚未逐条译审。MESH:D013373 · MeSH 2026。
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