6UEZ:
reference: A requirement for an active proton delivery network supports a Compound I mediated C-C bond cleavage in CYP51 catalysis., Hargrove TY, Wawrzak Z, Guengerich FP, Lepesheva GI, J Biol Chem. 2020 Jun 3. pii: RA120.014064. doi: 10.1074/jbc.RA120.014064. PMID: 32493730

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