这个词是什么意思？
A family of gram-negative coccoid to rod-shaped bacteria in the order Rhizobiales. They are obligate parasites chiefly of warm-blooded VERTEBRATES. Many are pathogenic.
中文名称索引；定义为 MeSH 英文原文，尚未逐条译审。MESH:D042021 · MeSH 2026。
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