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Gene aprA phylogeny based on deduced amino acid sequences of the aprA gene coding for the alpha subunit of the adenosine 5′ -phosphosulfate reductase. Sequences from this study are highlighted in light gray (Black Sea sediments) and dark gray (Peru margin sediments). Scale bar = 0.10 estimated substitutions per site. SOB, sulfide-oxidizing bacteria; SRB, sulfate-reducing bacteria; SRA, sulfate-reducing archaea.
