5WEH:
reference: Role of conformational change and K-path ligands in controlling cytochrome c oxidase activity., Liu J, Hiser C, Ferguson-Miller S, Biochem Soc Trans. 2017 Aug 24. pii: BST20160138. doi: 10.1042/BST20160138. PMID: 28842531

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