1PO5:
reference: An open conformation of mammalian cytochrome P450 2B4 at 1.6-A resolution., Scott EE, He YA, Wester MR, White MA, Chin CC, Halpert JR, Johnson EF, Stout CD, Proc Natl Acad Sci U S A 2003 Nov 11;100(23):13196-201. Epub 2003 Oct 16. PMID: 14563924

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