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Cytotoxicity studied in CACO-2 after exposure to SiQDs for 4 h and 24 h using the 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) assay. Cell viability (% of control) is plotted as mean ± SD for n = 3 experiments. Significant effects (p < 0.05) are marked with an asterisk *.
