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Gene expression profiles. a Type II collagen (COL2A1) and b aggrecan (ACAN) gene expression relative to 18S (2−∆Ct method) was evaluated at day 28. Values are mean + standard deviation; N = 4 per group; *p < 0.05 as compared to BMSC-Ch+. Please note the logarithmic scale for both means and standard deviations
