2P2D:
reference: Crystal Structure and Allosteric Regulation of the Cytoplasmic Escherichia colil-Asparaginase I., Yun MK, Nourse A, White SW, Rock CO, Heath RJ, J Mol Biol. 2007 Jun 8;369(3):794-811. Epub 2007 Mar 30. PMID: 17451745

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