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The osteogenic effects induced by PGS-P and L-PGS-P on rat bone mesenchymal stem cells. (A,B) The statistics of RT-qPCR results for RUNX2, ALP, and OCN gene expression levels which were normalized to GAPDH after 3 and 7 days of osteogenic treating. (C) rBMSCs cultured on different scaffolds in osteogenic medium for 7 days were stained for ALP examination. (D) ALP activity was assessed by quantitative method. **P < 0.01, compare with control group.
