4A7F:
reference: Structure of the rigor actin-tropomyosin-Myosin complex., Behrmann E, Muller M, Penczek PA, Mannherz HG, Manstein DJ, Raunser S, Cell. 2012 Jul 20;150(2):327-38. PMID: 22817895

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