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Comparison of the [4Fe–4S] cluster nest geometry as a function of ligating thiolate residues using the crystal structure of the [4Fe–4S] cluster containing ferredoxin (Fd-Pa, PDB code: 1DUR [41–43]). (a) UIAUGAU, (b) CIACGAC (native cluster binding motif), (c) JIAJGAJ. (Online version in colour.)
