4IB5:
reference: First Structure of Protein Kinase CK2 Catalytic Subunit with an Effective CK2beta-Competitive Ligand., Raaf J, Guerra B, Neundorf I, Bopp B, Issinger OG, Jose J, Pietsch M, Niefind K, ACS Chem Biol. 2013 Mar 18. PMID: 23474121

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