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Phylogenetic trees of predicted ExoU homologs from the National Center for Biology Information GenBank database. (a) Rooted phylogenetic tree with branch lengths; (b) an unrooted phylogenetic tree with branch lengths. The phylogenetic trees were made by ClustalW with the BLOSUM protein weight matrix. GenomeNet, Kyoto University Bioinformatics Center, Japan [35]. * The ORF positions in GenBank were corrected in this study.
