2OIV:
reference: Structural analysis of Xanthomonas XopD provides insights into substrate specificity of ubiquitin-like protein proteases., Chosed R, Tomchick DR, Brautigam CA, Mukherjee S, Negi VS, Machius M, Orth K, J Biol Chem. 2007 Mar 2;282(9):6773-82. Epub 2007 Jan 3. PMID: 17204475

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