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Effects of zinc oxide (ZnO) nanoparticles (NPs) on apparent permeability of fluorescein sulfonic acid (FS) for minimal defined serum-free medium (MDSF) (A)- or MDSF supplemented with 10% newborn bovine serum (MDS) (B)-grown rat alveolar epithelial cell monolayers (RAECMs) after 24 hours. Positive control was monolayers exposed to 0.1% TX-100 for 15 minutes. Negative control was monolayers not exposed to ZnO NPs. *Significantly different (P < 0.05) from negative control.
