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Neighbor-Joining tree based on 16S rRNA gene sequences of animal-associated and environmental strains of Bordetella. The 52 near full-length sequences (1376 bp) formed 10 clades (I–X) of phylogenetically closely related Bordetella isolates/species recovered from soil (brown), water (blue), plants (green) and animals (black). The 16S rRNA gene sequences of the beta-proteobacteria Burkholderia pseudomallei and Ralstonia solanacearum were used as outgroups.
