5FQK:
reference: De novo active sites for resurrected Precambrian enzymes., Risso VA, Martinez-Rodriguez S, Candel AM, Kruger DM, Pantoja-Uceda D, Ortega-Munoz M, Santoyo-Gonzalez F, Gaucher EA, Kamerlin SCL, Bruix M, Gavira JA, Sanchez-Ruiz JM, Nat Commun. 2017 Jul 18;8:16113. doi: 10.1038/ncomms16113. PMID: 28719578

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