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Effect of DEPs on induction of early apoptosis and late apoptosis/necrosis in A549 cells. Cell death was determined by the Annexin V-PI 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 in early apoptosis; *p < 0.05, statistically significant difference vs. corresponding control group in late apoptosis/necrosis
