Figure 3.

(a) Phylogenetic comparison of Acr3-1 sequences found in the groundwater to Acr3-1 from other known arsenic-resistant bacteria (257 amino acids considered) and (b) phylogenetic comparison of Acr3-2 sequences found in the groundwater to Acr3-2 from other known arsenic-resistant bacteria (259 amino acids considered). Clones obtained from both CD01 and CD04 wells in this study are in bold, and clones from CD01 are underlined. The percentage of clones is indicated in brackets. The percentage of replicate trees in which the associated taxa clustered together in the bootstrap test (1000 replicates) is shown above or near the relevant nodes.