2I2Q:
reference: Mechanism of Actin Filament Turnover by Severing and Nucleation at Different Concentrations of ADF/Cofilin., Andrianantoandro E, Pollard TD, Mol Cell. 2006 Oct 6;24(1):13-23. PMID: 17018289

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