这个词是什么意思？
A phylum of bacteria consisting of the purple bacteria and their relatives which form a branch of the eubacterial tree. This group of predominantly gram-negative bacteria is classified based on homology of equivalent nucleotide sequences of 16S ribosomal RNA or by hybridization of ribosomal RNA or DNA with 16S and 23S ribosomal RNA.
中文名称索引；定义为 MeSH 英文原文，尚未逐条译审。MESH:D020560 · MeSH 2026。
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