这个词是什么意思？
An envelope of loose gel surrounding a bacterial cell which is associated with the virulence of pathogenic bacteria. Some capsules have a well-defined border, whereas others form a slime layer that trails off into the medium. Most capsules consist of relatively simple polysaccharides but there are some bacteria whose capsules are made of polypeptides.
中文名称索引；定义为 MeSH 英文原文，尚未逐条译审。MESH:D016667 · MeSH 2026。
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