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Real-time RT-PCR analysis of the expression of osteogenesis-related genes in BMSCs cultured on the –NH2- and –CH3-modified substrates in the presence of 0, 10, 25, and 50 μM of PD98059 for 10 days. (a) Cbfα-1 and (b) ALP. ☆ P < 0.05 versus the respective –CH3-modified substrate; ◆ P < 0.05 versus the 0 μM dose group.
