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Atomic ratios of Cr:Fe in the aggregations of four control experiments. (A) Wild type MR-1 with Cr(VI) and hematite. (B) ΔmtrC mutant with Cr(VI) and hematite. (C) ΔomcA mutant with Cr(VI) and hematite. (D) Mutant ΔomcA-ΔmtrC with Cr(VI) and hematite. For each sample, at least five large aggregations were selected for the measurements.
