Figure 1

Unrooted neighbor-joining phylogenetic tree of the RNA polymerase subunit H computed from a Γ-corrected matrix of distances. Numbers close to nodes are bootstrap proportions. The scale bar represents the number of changes per position per unit branch length. For each taxon, the portion of the alignment from positions 57 to 83 is displayed. For clarity, identical amino acids shared by the current taxa and the first taxon (Aeropyrum pernix) are indicated by dashes, whereas stars correspond to missing amino acids.