Fig. 5. Maximum likelihood phylogeny of the cobalamin binding domain of HgcA and the WL pathway carbon monoxide dehydrogenase/acetyl-CoA synthase γ subunit.

HgcA and HgcAB clades were collapsed. Bootstrap support at nodes is indicated by black circles (>75) or white circles (50 to 75). Some archaeal and bacterial taxa were collapsed and color-coded. Blue and yellow branches indicate archaeal and bacterial lines of divergence that would suggest a potential archaeal origin for bacterial CFeSP. Cand, candidate phylum.