1BXR:
reference: Carbamoyl phosphate synthetase: closure of the B-domain as a result of nucleotide binding., Thoden JB, Wesenberg G, Raushel FM, Holden HM, Biochemistry 1999 Feb 23;38(8):2347-57. PMID: 10029528

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