1J2C:
reference: Crystal structure of rat heme oxygenase-1 in complex with biliverdin-iron chelate. Conformational change of the distal helix during the heme cleavage reaction., Sugishima M, Sakamoto H, Higashimoto Y, Noguchi M, Fukuyama K, J Biol Chem 2003 Aug 22;278(34):32352-8. Epub 2003 Jun 6. PMID: 12794075

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