Figure 9.

Protein tree of TyrR homologs. Nodes supported by bootstrap values of 998 or more are marked with solid circles, and the bootstrap values for nodes internal to these are shown. Generic names relevant to the organism abbreviations can be viewed in Fig. 8. A conserved region containing the σ⁵⁴ contact motif GAFTGA is highlighted as an orange band. "Imperfect" residues in this region are shown in lower-case fonts. Residue numbers are shown at the right. TyrR and PhhR are regulators of σ⁷⁰ and σ⁵⁴ promoters, respectively. Four σ⁵⁴ proteins of unknown function have very long branches, and to facilitate the visual presentation, the gaps in branch continuity shown represent a scale-bar distance of 0.1. Clades possessing σ⁵⁴ regulators are indicated with blue stripes, and σ⁷⁰ regulators are indicated with green stripes.