Figure 3. Partial sequence alignment of glutaminyl t-RNA synthetase showing a CSI that is specifically present in various sequenced Xanthomonadales and some other Gammaproteobacteria.

This CSI as well as a few other CSIs identified in this work (see Table 2 and Figures S13–S17) suggest a possible relationship of Xanthomonadales to these deep branching orders of Gammaproteobacteria.