3CXV:
reference: Characterization of active site structure in CYP121. A cytochrome P450 essential for viability of Mycobacterium tuberculosis H37Rv., McLean KJ, Carroll P, Lewis DG, Dunford AJ, Seward HE, Neeli R, Cheesman MR, Marsollier L, Douglas P, Smith WE, Rosenkrands I, Cole ST, Leys D, Parish T, Munro AW, J Biol Chem. 2008 Nov 28;283(48):33406-16. Epub 2008 Sep 24. PMID: 18818197

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