After Fig. 1 and 2 in Sun, Y et al. "Mechanical Properties of Single Type ll Collagen Molecule Paper No: 0082, 48th Annual Meeting of the Orthopaedic Research Society Stretching a procollagen ll molecule with an optical tweezers Cover glass Procollagen Cover glass XY stage Laser light The force-extension curve of a single collagen II 50100150200150300350 Extensions(nm) Image removed due to copyright considerations Figure 1 in Fuji, T et al. "Mechanical Properties of Single Hyaluronan Molecules. Paper No: 0390, 48th Annual Meeting of the Orthopaoedic Research SocietyAfter Fig. 1 and 2 in Sun, Y. et al. "Mechanical Properties of Single Type II Collagen Molecule." Paper No: 0082, 48th Annual Meeting of the Orthopaoedic Research Society. Image removed due to copyright considerations. Figure 1 in Fujii, T. et al. "Mechanical Properties of Single Hyaluronan Molecules." Paper No: 0390, 48th Annual Meeting of the Orthopaoedic Research Society