这个词是什么意思？
A nonapeptide hormone released from the neurohypophysis (PITUITARY GLAND, POSTERIOR). It differs from VASOPRESSIN by two amino acids at residues 3 and 8. Oxytocin acts on SMOOTH MUSCLE CELLS, such as causing UTERINE CONTRACTIONS and MILK EJECTION.
中文名称索引；定义为 MeSH 英文原文，尚未逐条译审。MESH:D010121 · MeSH 2026。
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