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Maximum-likelihood phylogenetic tree of Y. pseudotuberculosis , Y. wautersii and Y. pestis based on 500 concatenated multiple sequence alignments. The tree was rooted with Y. similis (not shown). Only bootstrap-based branch support values >70 % are shown. Bar, 0.001 amino acid substitutions per character. AAG, Auto-agglutinable; NAG, non-agglutinable; NT, non-typable as Y. pestis does not harbour the O-antigen; O, O antigen serotype; Unk, unknown serotype.
