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Analysis of protein delivery by NPL into airway epithelial cells (16HBE) by flow cytometry. 16HBE were treated with free or formulated OVA-FITC for different time. Trypan blue was used to determine the % of protein bound on cell surface. Results are the mean of three independent experiments. *:p < 0.05; **:p < 0.01; ***:p < 0.001.
