5XKP:
reference: Selective Deamination of Mutagens by a Mycobacterial Enzyme., Gaded V, Anand R, J Am Chem Soc. 2017 Aug 9;139(31):10762-10768. doi: 10.1021/jacs.7b04967. Epub, 2017 Jul 28. PMID: 28708393

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