2AAO:
reference: Structure of the regulatory apparatus of a calcium-dependent protein kinase (CDPK): a novel mode of calmodulin-target recognition., Chandran V, Stollar EJ, Lindorff-Larsen K, Harper JF, Chazin WJ, Dobson CM, Luisi BF, Christodoulou J, J Mol Biol. 2006 Mar 24;357(2):400-10. Epub 2005 Dec 20. PMID: 16430916

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