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Tensile biomechanical properties of samples described in Figure 1. For specimens from the superficial, middle, and deep layers, the tensile equilibrium modulus (a), tensile ramp modulus (b), tensile strength (c), and failure strain (d) were determined from equilibrium and then non-equilibrium failure testing of articular cartilage from aged NLA, DGN, and OA donors. *p<0.05, **p<0.01, ***p<0.005 versus NLA samples.
