3KUD:
reference: What makes Ras an efficient molecular switch: a computational, biophysical, and structural study of Ras-GDP interactions with mutants of Raf., Filchtinski D, Sharabi O, Ruppel A, Vetter IR, Herrmann C, Shifman JM, J Mol Biol. 2010 Jun 11;399(3):422-35. Epub 2010 Mar 31. PMID: 20361980

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