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Phylogenetic relationships of representative bacterial 16S rRNA gene sequences from four clone libraries of this study determined by the neighbor-joining method. Bootstrap values of >50% (obtained with 1,000 resamplings) are shown at nodes. The scale bar indicates 0.05 nucleotide substitutions per site. Reference sequences were obtained from RDP release 10 or GenBank. Methanobrevibacter ruminantium was used as an outgroup. GenBank accession numbers are in parentheses.
