1VGI:
reference: CO-trapping site in heme oxygenase revealed by photolysis of its co-bound heme complex: mechanism of escaping from product inhibition., Sugishima M, Sakamoto H, Noguchi M, Fukuyama K, J Mol Biol 2004 Jul 30;341(1):7-13. PMID: 15312758

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