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The expression of specific osteogenic markers (ALP, SPARC, and BMP-2) of hMSPCs cultured in the presence of osteogenic differentiation medium for 21 days on the surface of GO/PMMA composites as well as untreated PMMA, compared with undifferentiated hMSPCs cultivated in expansion medium as the negative control; p < 0.001 ***; p < 0.01 **; p < 0.05 *.
