Figure 4. Neighbor-joining tree based on 16S rRNA gene sequences showing phylogenetic relationships in the genus Geobacter.

Refer to Table 2 for the major OTUs. Desulfuromonas acetoxidans was used as an outgroup. Bootstrap values (100 trials, only > 50 are shown) are indicated at branching points. The bar indicates 2% sequence divergence. Accession numbers are shown in parentheses.