2JPW:
reference: Phosphorylation-dependent conformational transition of the cardiac specific N-extension of troponin I in cardiac troponin., Howarth JW, Meller J, Solaro RJ, Trewhella J, Rosevear PR, J Mol Biol. 2007 Oct 26;373(3):706-22. Epub 2007 Aug 22. PMID: 17854829

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