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Viability of HEK 293 T (a), A375 (b), and A549 (c) cell lines during 24 h and 72 h treatment with 20 and 100 nm Au NPs. Concentration is given in pcs/ml. Results are expressed as mean ± SEM significance between control cells and cells incubated with NPs of a given size and concentration (∗P < 0.05, ∗∗P < 0.01).
