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Expression of TGF-β1 and IL-10 genes by MSCs in co-culture with stimulated PBLs (a) and IVD + PBLs (b), after 1, 3 and 7 days. Quantitative RT-PCR analysis (relative expression normalized to GAPDH compared with day 0, represented as a mean ± SD; *p < 0.05 compared with day 1)
