2KRD:
reference: Solution structure of the regulatory domain of human cardiac troponin C in complex with the switch region of cardiac troponin I and W7: The basis of W7 as an inhibitor of cardiac muscle contraction., Oleszczuk M, Robertson IM, Li MX, Sykes BD, J Mol Cell Cardiol. 2010 Jan 29. PMID: 20116385

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