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Crystal structure of CpRd (PDB ID 1IRO) at 1.1 Å resolution. (a) Overall fold of chain A of CpRd. The Fe(Cys)4 center is displayed as a ball-and-stick representation. (b) NH···S H-bond interactions around the Fe(Cys)4 center of CpRd. The side chains of C6, C39, V8, Y11, L41, and V44 are omitted for clarity. Color code: Fe, green; C, cyan; S, yellow, O, red; N, blue.
