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[3Fe-4S] cluster of the ferricyanide-treated D14C ferredoxin from Pyrococcus furiosus. The cofactor inorganic core is shown in ball-and-stick representation. Sulfur and iron atoms are in yellow and brown, respectively. The cysteine at position 14 is facing away from the cluster. The presented crystal structure is based on chain A from PDB entry 3PNI.8
