A) Stereoview of backbone ensemble of Switch I region of Cdc42 wild type and T35A, and B) Backbone of Switch I region colored based on best-fit dynamics model assignments from dynamics calculations. Model assignments are: white, unassigned: blue, model 1 (S2 only); green, model 2 (S2 and τe); model 3, orange (S2 and Rex); model 4, red (S2, Rex, and τe); model 5, yellow (Sf2, Ss2, and τe).