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Phylogenetic trees showing the coevolution of (a) ArsA and (b) ArsB homologues, (c) ArsA and (d) Acr3 homologues, and (e) ArsA and (f) ArsP homologues, each pair encoded within the same operons. Numbers are assigned in (d) and retained in (c). Numbers are assigned counterclockwise in (f) and retained in (e). Paralogues are distinguished with a second digit, either 1 or 2, in the protein abbreviations. gi numbers are provided in Table 1.
