4Q01:
reference: A method for the second-site screening of K-Ras in the presence of a covalently attached first-site ligand., Sun Q, Phan J, Friberg AR, Camper DV, Olejniczak ET, Fesik SW, J Biomol NMR. 2014 Sep;60(1):11-4. doi: 10.1007/s10858-014-9849-8. Epub 2014 Aug , 3. PMID: 25087006

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