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Phylogenetic trees for McrA (A), PmoA (B), and MxaF (C) based on the partial amino acid sequences deduced from each functional gene. The numbers in parentheses are the accession numbers for nucleotide sequences in databases. The trees were constructed by using the neighbor-joining algorithm. The bootstrap values at the nodes are based on 100 trials. Scale bars = 0.1 amino acid substitution.
