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. 2016 Feb 17;6:21828. doi: 10.1038/srep21828

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Relative expression of endogenic-associated genes: (A) VWF, (B) PECAM-1 and (C) ENOS, by HUVECs cultured on both the unmodified control surfaces and TiO₂ NFs surfaces for 7 days and 14 days. Statistical significance was assessed relative to the control surfaces for each time interval (*P < 0.05).