Figure 2. Phylogenetic analysis of class A β-lactamases calculated by Bayesian inference. Number of mutations occurring along each branch are represented visually by the lengths of the branches. dN /dS ratios for all branches except the tips are given along the lengths of the branches. Boldface indicates plasmidic genes. Black dots indicate mobilizations to plasmids. Numbered brackets indicate monophyletic divisions within the tree. *dN, nonsynonymous substitution rate; dS, synonoymous substitution rate.
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