1PC5:
reference: Mechanisms of redox-coupled proton transfer in proteins: role of the proximal proline in reactions of the [3Fe-4S] cluster in Azotobacter vinelandii ferredoxin I., Camba R, Jung YS, Hunsicker-Wang LM, Burgess BK, Stout CD, Hirst J, Armstrong FA, Biochemistry 2003 Sep 16;42(36):10589-99. PMID: 12962482

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