2NTY:
reference: Structural evidence for a common intermediate in small G protein-GEF reactions., Thomas C, Fricke I, Scrima A, Berken A, Wittinghofer A, Mol Cell. 2007 Jan 12;25(1):141-9. PMID: 17218277

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