5ZCO:
reference: X-ray structural analyses of azide-bound cytochrome c oxidases reveal that the H-pathway is critically important for the proton-pumping activity., Shimada A, Hatano K, Tadehara H, Yano N, Shinzawa-Itoh K, Yamashita E, Muramoto K, Tsukihara T, Yoshikawa S, J Biol Chem. 2018 Aug 3. pii: RA118.003123. doi: 10.1074/jbc.RA118.003123. PMID: 30077971

This OCA Structure page
uses Jmol, developed by the Jmol Development Team (documentation).