4JWS:
reference: Structural basis for effector control and redox partner recognition in cytochrome P450., Tripathi S, Li H, Poulos TL, Science. 2013 Jun 7;340(6137):1227-30. doi: 10.1126/science.1235797. PMID: 23744947

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