Figure 5: Effect of the proteins’ Young’s modulus (level I) on the composite moduli (level II).
From: Multiscale structural gradients enhance the biomechanical functionality of the spider fang

(a) Young’s modulus and (b) shear modulus of parallel-fibred and rotated-plywood fibril arrays, made from chitin fibrils (modulus ~\n100 GPa, volume fraction 0.2) and a protein matrix (range of modulus). The circle in a indicates the typical range of the experimental values25.