3GRF:
reference: X-ray structure and kinetic properties of ornithine transcarbamoylase from the human parasite Giardia lamblia., Galkin A, Kulakova L, Wu R, Gong M, Dunaway-Mariano D, Herzberg O, Proteins. 2009 May 4. PMID: 19507245

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