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Neighbor-joining phylogenetic trees obtained by using the 16S rRNA genes (a) and the atpD genes (b). The scale bars indicate phylogenetic distances. Bootstrap values are indicated at the nodes for a total of 1,000 replicates. Boldface type indicates species in which horizontal gene transfer of the atpD gene is suspected. The strains and the accession numbers of the atpD genes and 16S rDNA sequences are shown in Table 1.
