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Phylogenetic tree of SFG rickettsiae derived from the gltA gene (a) and phylogenetic tree of SFG rickettsiae derived from the 17 kDa genus-common antigen gene (b) by the neighbor-joining method. The numbers at nodes are the bootstrap values obtained from 100 re-samplings. The scale bars represent 0.5% (glt-A gene) and 1% (17 kDa genus-common antigen gene) differences in nucleotide sequences (GenBank accession numbers are shown).
