这个词是什么意思？
A polyamine formed from putrescine. It is found in almost all tissues in association with nucleic acids. It is found as a cation at all pH values, and is thought to help stabilize some membranes and nucleic acid structures. It is a precursor of spermine.
中文名称索引；定义为 MeSH 英文原文，尚未逐条译审。MESH:D013095 · MeSH 2026。
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