Figure 6a.

Phylogenetic tree of the dsrAB protein sequences. The trees (6A and 6B) were inferred from proteins sequences using RAxML (maximum-likelihood) in the software program ARB. The sequences of Archaeoglobus fulgidus, A. profundus, and A. veneficus were used as outgroup, but were pruned from the tree. The sequence of D. ruminis is written in bold. The black circles are bootstrap values between 100–75%, the white circles are values between 75–50%. The scale bar corresponds to 10% estimated sequence divergence.