Figure 1.

The nonlinear behavior of biopolymer networks plotted as the shear modulus, G, versus stress, T, or the shear modulus normalized by the initial shear modulus, G/G₀, versus stress normalized by the critical stress at the onset of nonlinearity, T/T_c, for (A) F-actin/scruin networks (8); (B) F-actin/rigor-HMM networks with actin concentration 19 μM, mean F-actin length 21 μm, and various increasing molar HMM/actin concentration ratios, $R=c_{\text{HMM}}/c_{\text{a}}$ (arrow) (13); (C) F-actin/filamin networks for lower F-actin concentrations (15); and (D) vimentin networks (39). To see this figure in color, go online.