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Phylogenetic relationships of borehole fluid dsrB fragments from the domain Archaea and uncultivated lineages. Gene clones recovered in this study are highlighted in bold font; the fractional abundance of identical clones recovered from the sample is listed in parentheses. Black (100%), gray (>80%), and white (>50%) circles indicate nodes with bootstrap support, from 1000 replicates. The scale bar corresponds to 0.1 substitutions per nucleotide position.
