4E2Q:
reference: Structural and functional insights into (S)-ureidoglycine aminohydrolase, key enzyme of purine catabolism in Arabidopsis thaliana., Shin I, Percudani R, Rhee S, J Biol Chem. 2012 May 25;287(22):18796-805. Epub 2012 Apr 5. PMID: 22493446

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