2PK9:
reference: Structure of the Pho85-Pho80 CDK-Cyclin Complex of the Phosphate-Responsive Signal Transduction Pathway., Huang K, Ferrin-O'Connell I, Zhang W, Leonard GA, O'Shea EK, Quiocho FA, Mol Cell. 2007 Nov 30;28(4):614-23. PMID: 18042456

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