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Phylogenetic comparison of ArrA sequences found in the groundwater to ArrA from other known arsenate respiring bacteria (139 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.
