2ZAX:
reference: Evaluation of the Functional Role of the Heme-6-propionate Side Chain in Cytochrome P450cam., Harada K, Sakurai K, Ikemura K, Ogura T, Hirota S, Shimada H, Hayashi T, J Am Chem Soc. 2007 Dec 19;. PMID: 18088124

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