3VYC:
reference: A 2.1-A-resolution crystal structure of unliganded CRM1 reveals the mechanism of autoinhibition., Saito N, Matsuura Y, J Mol Biol. 2013 Jan 23;425(2):350-64. doi: 10.1016/j.jmb.2012.11.014. Epub 2012 , Nov 16. PMID: 23164569

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