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Phylogeny of the V3 region of Methanobacteriales 16S rRNA type sequences from the Ribosomal Database Project (29). The phylogenetic positions of the OTUs discovered from pyrosequencing are indicated. The bars represent the abundance of each of the OTUs in HRFI samples (white) and LRFI samples (black). Dots at internal branches indicate bootstrap support greater than 80%.
