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Effects of PQQ and estrogen on bone biomechanical indexes in OVX mice. Evaluation of biomechanical properties on femur by using a three-point blending test, including (A) maximum load, (B) energy absorption, (C) elastic modulus and (D) bending stiffness. Data were the means ± SEM (n =15 for each group). *P <0.05 and **P < 0.01, vs. the sham control group. #P< 0.05 and ##P<0.01, vs. the OVX-Veh group.
