3IIV:
reference: Evolutionary optimization of computationally designed enzymes: Kemp eliminases of the KE07 series., Khersonsky O, Rothlisberger D, Dym O, Albeck S, Jackson CJ, Baker D, Tawfik DS, J Mol Biol. 2010 Mar 5;396(4):1025-42. Epub 2009 Dec 28. PMID: 20036254

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