4RM4:
reference: The crystal structure of the versatile cytochrome P450 enzyme CYP109B1 from Bacillus subtilis., Zhang A, Zhang T, Hall EA, Hutchinson S, Cryle MJ, Wong LL, Zhou W, Bell SG, Mol Biosyst. 2015 Jan 14. PMID: 25587700

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