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Phylogenetic tree based on 16S rRNA gene sequences, showing the positions of newly isolated strains CdA-2 and CdA-3 in the family Geobacteraceae (29). The Geobacter cluster in this group is indicated by boldface lines. Phylogenetic distances were calculated as described by Felsenstein (20). The sequence of Escherichia coli was used as an outgroup. Bar = 10% estimated sequence divergence.
