Maximum-likelihood phylogenetic tree (Fig. S1), DNA sequence identities of the newly developed arrA gene primers (Fig. S2), translated amino acid sequence identities (Fig. S3), PCR amplification (Fig. S4), maximum-likelihood phylogenetic analysis of translated amino acids (Fig. S5), multidimensional scaling plot (Fig. S6), nonmetric multidimensional scaling plots (Fig. S7), Sampling locations, arsenic concentrations, and other chemical characteristics of soil and groundwater samples used in this study (Table S1), primers and sequences (Table S2), and distribution of the previously described arrA gene sequences from GenBank (Table S3) and Cache Valley Basin, UT (Table S4).
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