3OX6:
reference: Structural basis for the differential effects of CaBP1 and calmodulin on Ca(V)1.2 calcium-dependent inactivation., Findeisen F, Minor DL Jr, Structure. 2010 Dec 8;18(12):1617-31. PMID: 21134641

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