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The interaction energy between the HVR and the catalytic domain in the models 1 (A) and 2 (B) of K-Ras4B-GDP and models 1 (C) and 2 (D) of K-Ras4B-GTP in their WT and mutant states. In all cases the electrostatic interactions contribute most to the HVR-catalytic domain interactions. vdW, van der Waals.
