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The genes expression of COL1A2, COL2A1, COL10A1, AGG and SOX9 in dynamic culture group and static culture group at 4, 7, 14 and 21 days were presented, respectively. All gene expressions were normalized to housekeeping gene GAPDH; data are expressed as the mean SEM (n = 3); *P < 0.05, **P < 0.01 and ***P < 0.001
