3RN6:
reference: Rescue of the orphan enzyme isoguanine deaminase., Hitchcock DS, Fedorov AA, Fedorov EV, Dangott LJ, Almo SC, Raushel FM, Biochemistry. 2011 Jun 28;50(25):5555-7. Epub 2011 Jun 7. PMID: 21604715

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