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Figure 8: Alkaline phosphatase (ALP) activity of hMSCs cultured on uncoated and RGD peptide-coated 30 and 100 nm TiO2 nanotubes after 2 weeks of incubation. * denotes significance between uncoated 30 nm TiO2 nanotubes versus RGD peptide-coated 30 nm TiO2 nanotubes.