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Phylogenetic relationships among partial mcrA DNA sequences (470 bp) of clones recovered from fecal and sewer samples (this study) and previously sequenced mcrA genes from methanogen species (italicized). The tree was inferred by the neighbor joining method with 1,000 bootstrap pseudoreplicates using the MEGA 3.1 tree building program and was rooted using the mcrA sequence from Methanopyrus kandleri. The scale bar represents 5% estimated sequence divergence.
