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. 2016 Mar 9;6:22737. doi: 10.1038/srep22737

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(a) The miR-21 expression levels. (b) HeLa cell viability after exposure to different nanocarriers at a concentration of 2 nM for 48 h. (c) Different concentrations of Dox stimulation on HeLa cells which were pretreated with GNPs-ES or GNPs-ES/ZnO at 1 nM or 2 nM, respectively. Error bars indicate s.d. (n = 3).