4FJS:
reference: Structural and functional insights into (s)-ureidoglycolate dehydrogenase, a metabolic branch point enzyme in nitrogen utilization., Kim MI, Shin I, Cho S, Lee J, Rhee S, PLoS One. 2012;7(12):e52066. doi: 10.1371/journal.pone.0052066. Epub 2012 Dec 20. PMID: 23284870

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