3OIU:
reference: Allosteric modulation of Ras-GTP is linked to signal transduction through Raf kinase., Buhrman G, Kumar VS, Cirit M, Haugh JM, Mattos C, J Biol Chem. 2010 Nov 22. PMID: 21098031

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