Figure 3. Varying concentration reveals universality of the local stiffness distribution.

(a) Distribution of local stiffnesses k_loc, at force dipole length d∼15 μm, for fibrin networks with concentrations c=0.2 mg ml⁻¹ (red), c=0.8 mg ml⁻¹, (blue) and c=1.6 mg ml⁻¹ (green). Inset shows geometric s.d. σ_loc versus force dipole length d. (b) Distribution of local stiffnesses k_loc/κ scaled by the bending modulus, obtained by fitting model parameters for each experimental network using data from macroscopic rheology, at scaled force dipole length , where is the mesh size, for fibrin networks with same concentrations as in a. Inset shows geometric s.d. σ_loc versus scaled force dipole length .