"alpha subgroup"^^ . . "Proteobacteria alpha subdivision"^^ . "Alphabacteria"^^ . "GC_ID:11"^^ . "alpha subdivision"^^ . "PMID:11541974"^^ . . . "ncbi_taxonomy"^^ . "PMID:16166687"^^ . "PMID:11837318"^^ . "Alphaproteobacteria"^^ . "Purple bacteria, alpha subdivision"^^ . "alpha proteobacteria"^^ . "PMID:19060069"^^ . "PMID:16403855"^^ . "a-proteobacteria"^^ .