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Maximum likelihood tree of the δ-proteobacterium's 16S rRNA gene sequence from C. concentrica and related organisms. The tree was built on 1178 nucleotides of the 16S rRNA gene. An uncultured euryarchaeote sp. (AB077227) was used as an outgroup for the analysis (not shown in the tree). The scale bar indicates 0.1 nucleotide changes (10%) per nucleotide position. U, uncultured; I, isolates.
