Figure 4.

Consensus unrooted trees generated by the Neighbor-Joining distance method for the NAD+ dependent (A) and ATP-dependent DNA ligases (B). The circles highlight the main groups of bacteria. The homologs in Xanthomonadales are in square boxes. The symbol * indicates the beta proteobacteria. Some copies of homologs were excluded from this analysis given the low similarity among the DNA ligase ATP-dependent.