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Maximum-likelihood phylogenetic tree of gamma-proteobacterial 16S rRNA genes cloned from LCHF carbonate chimneys. Lost City hydrothermal field environmental clones are in boldface type. Labeled phylogenetic groups correspond to the groups used in the T-RFLP analysis (Fig. 6). Trees are unrooted, and scale bars represent 1 nucleotide change per 10 bases. GenBank accession numbers are in parentheses.
