6ASA:
reference: KRAS Switch Mutants D33E and A59G Crystallize in the State 1 Conformation., Lu J, Bera AK, Gondi S, Westover KD, Biochemistry. 2018 Jan 23;57(3):324-333. doi: 10.1021/acs.biochem.7b00974. Epub, 2017 Dec 28. PMID: 29235861

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