5P21:
reference: Refined crystal structure of the triphosphate conformation of H-ras p21 at 1.35 A resolution: implications for the mechanism of GTP hydrolysis., Pai EF, Krengel U, Petsko GA, Goody RS, Kabsch W, Wittinghofer A, EMBO J 1990 Aug;9(8):2351-9. PMID: 2196171

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