4WIH:
reference: High-resolution crystal structure of cAMP-dependent protein kinase from Cricetulus griseus., Kudlinzki D, Linhard VL, Saxena K, Sreeramulu S, Gande S, Schieborr U, Dreyer M, Schwalbe H, Acta Crystallogr F Struct Biol Commun. 2015 Aug 1;71(Pt 8):1088-93. doi:, 10.1107/S2053230X1501242X. Epub 2015 Jul 29. PMID: 26249705

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