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Phylogenetic tree generated by maximum-likelihood analysis of 16S rDNA sequences, showing the relationship of G. ferrireducens to previously described eubacterial sequences. Pyrococcus abyssi was used as the outgroup, and the branching order was identical when maximum-parsimony and distance-based algorithms were applied to aligned sequences in PAUP 4.0b 4a (35), with hypervariable regions masked (1,000 bases were considered).
