这个词是什么意思？
Order in class ALPHAPROTEOBACTERIA that are endosymbionts in eukaryotic cells. High morbidity and mortality are frequently associated with Rickettsiales transmitted by INSECT VECTORS.
中文名称索引；定义为 MeSH 英文原文，尚未逐条译审。MESH:D000076944 · MeSH 2026。
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