Figure 7.

Zoom-in from Fig. 5 showing tyrA synteny for the lower-gamma Proteobacteria (enteric lineage). Deduced phylogenetic events numbered on the left are described in Table 6. The branching position for Buchnera is as suggested in ref. [7]. Dotted horizontal lines near the top of the tree indicate branch lengths that were shortened for convenience of presentation. Dotted outlining of boxes around some genes indicates their pseudogene status. It is unknown if the various open reading frame (ORF) insertions are functional.