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Cladogenesis of P. americana Bacteroidetes species. Maximum-likelihood trees of 16S rRNA genes (a) and 14 concatenated single-copy gene markers (b) are shown. Barnesiella intestinihominis was used as an outgroup. Scale bars indicate 20% and 5% estimated sequence divergence, respectively. See Data Set S2 and Table 5 for the accession numbers of sequences used in these analyses.
