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Fe(II) (mM) before and after centrifugation and total soluble arsenic in cultures of G. sulfurreducens grown in defined medium using Fe(III) citrate as the electron acceptor and supplemented with 100 μM As(V). ▴, Fe(II) (mM) before centrifugation; ▪, Fe(II) (mM) after centrifugation; •, total As (μM); ⧫, protein concentration (mg/ml).
