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Cell viability (MTT assay) of control A549, Calu-3, and 3T3 cells, and of cells exposed for 24 h to CeO2-NPs (10, 100, and 500 µg/mL). Results are expressed as means ± SD of six replicates per tested condition and three independent assays (n = 18). Asterisks indicate significant differences with respect to the untreated control cells (p < 0.05).
