1DY7:
reference: Proton-coupled structural changes upon binding of carbon monoxide to cytochrome cd1: a combined flash photolysis and X-ray crystallography study., Sjogren T, Svensson-Ek M, Hajdu J, Brzezinski P, Biochemistry 2000 Sep 12;39(36):10967-74. PMID: 10998233

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