FIG. 3.

Phylogenetic analysis of recovered continental margin dissimilatory (bi)sulfite reductase subunit A protein coding sequences and selected sequences recovered from other different environmental sources and formally described species. Collapsed sequence clades were defined by branching order, and the clone composition and genetic identities of each are provided. The collapsed sequence clade marked by an asterisk indicates the position of clones having the numerically dominant RFLP pattern. The deeply branching sequence lineage is designated at the unifying branch node marked A, and divergent sequences showing an apparent distant relationship to the delta subdivision of the class Proteobacteria are indicated by the node designation B. Continental margin cloned sequences are labeled by margin (Mexico = M; Washington = W), site number (M = 300 or 306; W = 301, 306, or 307), and an arbitrary clone number. The percentage of 500 bootstrap samples that supported each branch is shown. Bootstrap values of <50% are not shown.