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Here is a scheme of the two-spring model used to produce Eq. 1. The viscoelastic substrate is characterized by its elastic stiffness and stress-relaxation time given by γsub/κ. The conformational change of FAK is described by a potential U(u) (see Fig. 3), and the associated relaxation time determined by the damping constant γFAK. To see this figure in color, go online.
