3RZI:
reference: Dynamic Cross-Talk among Remote Binding Sites: The Molecular Basis for Unusual Synergistic Allostery., Jiao W, Hutton RD, Cross PJ, Jameson GB, Parker EJ, J Mol Biol. 2012 Jan 27;415(4):716-26. Epub 2011 Dec 2. PMID: 22154807

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