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Osteogenic differentiation of BMMSCs on different matrix stiffnesses. (A) Sox2 and Oct4 gene expressions on different matrices after 4h, 24h, 72h and 1 week. (B) Sox2 and Oct4 gene expressions on 13-16 kPa, 48-53 kPa and 62-68 kPa at different time point. *P<0.05, **P<0.01.
