6GRR:
reference: Oxygen Activation Switch in the Copper Amine Oxidase of Escherichia coli., Gaule TG, Smith MA, Tych KM, Pirrat P, Trinh CH, Pearson AR, Knowles PF, McPherson MJ, Biochemistry. 2018 Aug 24. doi: 10.1021/acs.biochem.8b00633. PMID: 30110143

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