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4-day exposure repeated exposure of RAW264.7 cells to SiO2 NP compared with acute exposure, by flow cytometer. (A) Viability assay of SiG exposed cells measured with propidium iodide. (B) Green silica (SiG) internalization. (a: repeated 2 µg/mL versus acute 5 and 10 µg/mL, p-value < 0.05).
