3JBK:
reference: The Structural Basis of Actin Organization by Vinculin and Metavinculin., Kim LY, Thompson PM, Lee HT, Pershad M, Campbell SL, Alushin GM, J Mol Biol. 2016 Jan 16;428(1):10-25. doi: 10.1016/j.jmb.2015.09.031. Epub 2015, Oct 20. PMID: 26493222

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