1SMJ:
reference: A single mutation in cytochrome P450 BM3 induces the conformational rearrangement seen upon substrate binding in the wild-type enzyme., Joyce MG, Girvan HM, Munro AW, Leys D, J Biol Chem 2004 May 28;279(22):23287-93. Epub 2004 Mar 12. PMID: 15020590

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