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Tensile behavior of silk compared to various natural materials, including merino wool, silkworm silk (shown as “silk”), spider silk, and synthetic materials, including Kevlar 29, polyethylene terephthalate (PET), and nylon 6. The y-axis shows tensile stress (force per unit area) in GPa, and the x-axis shows tensile strain (extension normalized by initial length) as a dimensionless number. Copyright 2004 American Chemical Society, reproduced with permission from [44].
