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(A) Membrane topology model of RnfB. Cysteine ligands for the three FeS centers are highlighted: red for C49, C52, C57, and C73; blue for C114, C117, C120, and C124; and green for C144, 147, C150, and C154. (B) Structural model of RnfB with the corresponding cysteine residues colored red. The model was created using ROBETTA.
