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Maximum likelihood phylogenetic tree of PmoA from cultured Methanococcales, and some related environmental clones. PmoA sequences recovered from the metagenome are underlined and labeled with their contig names. The Nitrosopumilus maritimus ammonia monooxygenase subunit A protein was used as the outgroup of the tree. Nodes with greater than 70 or 90% bootstrap support are indicated with a gray or black circle, respectively. Scale bar indicates substitutions per site.
