2AIR:
reference: T-State Active Site of Aspartate Transcarbamylase: Crystal Structure of the Carbamyl Phosphate and l-Alanosine Ligated Enzyme(,)., Huang J, Lipscomb WN, Biochemistry. 2006 Jan 17;45(2):346-52. PMID: 16401065

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