Fig. 4.—

The unrooted Bayesian phylogenetic tree of 166 cyt b representatives (COB_50), obtained by sequence clustering from 7,093 homologs based on maximum 50% shared identities. All branches were transformed to equal length for demonstration. Detailed information on tip labels, branching probabilities, and original branching lengths is provided in supplementary figure S1, Supplementary Material online. Major clades are illustrated in the same color. The first line of the clade annotation is the dominant taxon, and the second line refers to the major Q_o motifs. Five clades of cyt b marked with “mixed taxa” do not have a major phylogenetic group but show distinct Q_o motifs. Cyt b fused with class I cyt c and ISP are labeled with -cyt c and -FeS, respectively. The accession numbers of all sequences analyzed, and Q_o motifs and clade-specific informations are listed in supplementary tables S3–S10, Supplementary Material online.