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Phylogenetic tree based on a distance matrix prepared from an alignment of partial 16S rRNA sequences (1,404 bases) of Methanomethylovorans hollandica and closely related methanogens. Reference sequences were obtained from the GenBank, EMBL, and Ribosomal Database Project databases. Methanospirillum hungateii was used as the outgroup. Scale bar, 10 base substitutions per 100 bases. The names of methanogens which are able to utilize DMS as a carbon source are underlined.
