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MTT activities of A549 cells after 24 h exposure to nano- and micro-ZnO in DMEM with various percentages of FBS. *p < 0.05 compared to untreated controls; δ p < 0.05 compared between treated groups. Particle size and serum-related contrasts were both observed by two-way ANOVA, p < 0.001 at 20–80 μg/mL
