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Effect of DEPs on reduction of protein level in BEAS-2B cells. The cells were treated with 1, 10, 25, and 50 μg/mL of the particles for 2, 24, and 48 h. Protein level was determined by the sulforhodamine B assay. a B7-derived DEPs, b B20-derived DEPs, and c SHB-derived DEPs. Data are expressed as means ± SD from three independent experiments. *p < 0.05, statistically significant difference vs. corresponding control group
