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The stretching device. (a) The fully assembled device is comprised of five parts: (b) two fasteners, the peg, the pulling clamp, and the main container. The distance from the starting point at the steady edge to the starting point at the pulling edge (L0) is 5 cm. The peg is marked with 0.1% strain intervals. The grooves in the pulling clamp ensures the membrane is intact and stable during the strain
