4HRQ:
reference: Identification of Function and Mechanistic Insights of Guanine Deaminase from Nitrosomonas europaea: Role of the C-Terminal Loop in Catalysis., Bitra A, Hussain B, Tanwar AS, Anand R, Biochemistry. 2013 May 6. PMID: 23557066

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