这个词是什么意思？
A polypeptide substance comprising about one third of the total protein in mammalian organisms. It is the main constituent of SKIN; CONNECTIVE TISSUE; and the organic substance of bones (BONE AND BONES) and teeth (TOOTH).
中文名称索引；定义为 MeSH 英文原文，尚未逐条译审。MESH:D003094 · MeSH 2026。
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