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Maximum likelihood phylogenetic tree of the 16S rRNA gene from cultured Methanococcales and associated non-methanotrophic Gammaproteobacteria, and some related environmental clones. Gray wedges indicate monophyletic groups of sequences. Cultured isolated from the Fusobacteria were used as the outgroup. Nodes with greater than 70 or 90% bootstrap support are indicated with a gray or black circle, respectively. Scale bar indicates substitutions per site.
