3SHR:
reference: Crystal Structure of cGMP-Dependent Protein Kinase Reveals Novel Site of Interchain Communication., Osborne BW, Wu J, McFarland CJ, Nickl CK, Sankaran B, Casteel DE, Woods VL Jr, Kornev AP, Taylor SS, Dostmann WR, Structure. 2011 Sep 7;19(9):1317-27. PMID: 21893290

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