2TN4: Four Calcium Tnc
reference: Structures of four Ca2+-bound troponin C at 2.0 A resolution: further insights into the Ca2+-switch in the calmodulin superfamily., Houdusse A, Love ML, Dominguez R, Grabarek Z, Cohen C, Structure 1997 Dec 15;5(12):1695-711. PMID: 9438870

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