FIG. 4.

Normalized elastic modulus as a function of applied force in the measurements for increasing (●, black) and decreasing (□, gray) forces. (a) For filamin/F-actin networks (n=13), network elasticity measured for decreasing stress is not consistent with that for increasing stress. Inset: the stress-dependent mechanical properties are reversible in the measurement at smaller deformations. (b) For streptavidin/biotin-F-actin networks (n=17), similar values of shear modulus are exhibited for increasing and decreasing force.