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(a) Viability of A549, HaCat and HT29 cells incubated with silica NPs for 24 hrs as determined by the MTT assay. * and ** indicate that the viability is significantly lower than the control with p < 0.05 and p < 0.01, respectively. (b) DNA strand breaks induced by silica NP incubation for 24 hrs as determined by the Comet assay. * and ** indicate that the DNA tail is significantly longer than the control with p < 0.05 and p < 0.01, respectively.
