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Phylogenetic tree based on the partial 16S rDNA sequences of E. canis isolates. To root the tree, the corresponding sequence of Neorickettsia (N.) sennetsu was used as an outgroup. Accession numbers for E. canis isolates and the outgroup species N. sennetsu are given in parentheses. The scale bar indicates the number of substitutions per nucleotide position. The numbers at the nodes represent the percentage of 1,000 bootstrap resamplings.
