3CP4:
reference: Crystal structure of the cytochrome P-450CAM active site mutant Thr252Ala., Raag R, Martinis SA, Sligar SG, Poulos TL, Biochemistry 1991 Dec 3;30(48):11420-9. PMID: 1742281

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