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. 2016 May 12;6:25720. doi: 10.1038/srep25720

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Group A: pFDNA-Ag@SiO₂-NPs; Group B: pFDNA-Ag@SiO₂-NPs treated by DNase I; Group C: Blank Ag@SiO₂ hollow nanoparticles; Group D: 293 T cells as the negative control.