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Alkaline phosphatase activity of mesenchymal stem cells cultured with different-sized TiO2 nanoparticles (0.10 mg/mL) for 7 and 14 days, respectively.
Notes: The initial cell seeding density was 2 × 104 cells/cm2. Error bars represent the mean ± standard deviation for n = 6, *P < 0.05, **P < 0.01.
