Figure 2

Phylograms of selA, selB, selC, selD and ybbB. Phylograms were inferred using phyML2.4 from curated T-Coffee alignments. The values above and below each branch indicate boostrap values (>70) of maximum likelihood analysis and posterior probabilities (>0.90) of Bayesian analysis respectively. In all trees γ-proteobacteria are highlighted in red, β-proteobacteria in blue and Sinorhizobium meliloti (α-proteobacteria) in green. Red circles denote putative horizontal gene transfer events.