1KMW:
reference: A structural model of the catalytic subunit-regulatory subunit dimeric complex of the cAMP-dependent protein kinase., Tung CS, Walsh DA, Trewhella J, J Biol Chem 2002 Apr 5;277(14):12423-31. Epub 2002 Jan 17. PMID: 11799117

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