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The reduced and oxidized cofactors are shown in blue and red, respectively. The two chains of the MerA homodimer are shown in orange and green. The dashed line represents the charge transfer interactions between the C141 thiolate and FAD. Kh is the equilibrium constant between the NADPH/FAD and NADP+/FADH– redox states. The red arrow shows the Hg2+ transfer studied in this work.
