2EIN: Zinc Ion Binding Structure Of Bovine Heart Cytochrome C Oxid Fully Oxidized State
reference: A histidine residue acting as a controlling site for dioxygen reduction and proton pumping by cytochrome c oxidase., Muramoto K, Hirata K, Shinzawa-Itoh K, Yoko-o S, Yamashita E, Aoyama H, Tsukihara T, Yoshikawa S, Proc Natl Acad Sci U S A. 2007 May 8;104(19):7881-6. Epub 2007 Apr 30. PMID: 17470809

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