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(a) all genes detected (b) carbon cycling (c) nitrogen cycling and (d) sulfur cycling genes detected in bioreactors inoculated with Hanford well H-100 groundwater amended with (X) 0 mg/L Cr(VI), (○) 0.1 mg/L Cr(VI) and (▾) 3.0 mg/L Cr(VI). W = weeks.
