FIG. 3.

Phylogenetic distance trees of representative bacterial strains inferred from the deduced amino acid sequences of the aclB (A), porA (B), and oorA (C) genes by the neighbor-joining method using 96 (aclB), 60 (porA), or 35 (oorA) homologous residues for each organism. The deep-sea epsilonproteobacterial strains examined in this study are boldfaced. Bootstrap values of >50% for the branches are shown (based on 100 replicates). Each bar represents the indicated number of changes per amino acid position. Database accession numbers are given in parentheses.