4JZ9:
reference: Crystal Structures of Carbamate Kinase from Giardia lamblia Bound with Citric Acid and AMP-PNP., Lim K, Kulakova L, Galkin A, Herzberg O, PLoS One. 2013 May 20;8(5):e64004. doi: 10.1371/journal.pone.0064004. Print 2013. PMID: 23700444

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