1WNV:
reference: Roles of distal Asp in heme oxygenase from Corynebacterium diphtheriae, HmuO: A water-driven oxygen activation mechanism., Matsui T, Furukawa M, Unno M, Tomita T, Ikeda-Saito M, J Biol Chem 2005 Jan 28;280(4):2981-9. Epub 2004 Nov 04. PMID: 15528205

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