In Vitro Uptake of Hydroxyapatite Nanoparticles and Their Effect on Osteogenic Differentiation of Human Mesenchymal Stem Cells

Figure 4

TEM images of cellular uptake of HA NPs in hMSCs. The cells were incubated with 10 μg/ml of S50 (a, d), S100 (b, e), and S150 (c, f) for 24 h. The bar is 2 μm for (a–c), 500 nm for (d–f).

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