3MKS:
reference: An allosteric inhibitor of substrate recognition by the SCF(Cdc4) ubiquitin ligase., Orlicky S, Tang X, Neduva V, Elowe N, Brown ED, Sicheri F, Tyers M, Nat Biotechnol. 2010 Jul;28(7):733-7. Epub 2010 Jun 27. PMID: 20581844

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