Fig. 5.

Maximum likelihood tree of the RnfD homologs. The tree contains representative sequences from the phyla where RnfD is found (Proteobacteria, Firmicutes, Methanosarcinaceae, Fusobacteria, Dictyoglomi, Spirochaetes, Bacteroidetes/Chlorobi, Synergistales, Thermotogales). The sequence of the NqrB homolog of Pseudomonas aeruginosa (accession number NP_251688) served as the outgroup. Number between parentheses is the Genbank accession number. Scale bar represents the number of substitutions per site