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Fig. 11. Representative images from independent experiments when human keratinocyte cells were treated with biosynthesized nanoparticles at 500 μg mL−1 concentration and cells stained with DAPI after 96 hours, (a) control cells (b) cells treated with SiO2 (c) SiO2@Ag (d) SiO2@Au and (e) SiO2@Au–Ag NCs.