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