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. 2014 May 27;5:3894. doi: 10.1038/ncomms4894

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(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.