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Effect of PPI on the cell survival rate of 16HBE cells. 16HBE cells were incubated with different concentrations of PPI (1.25, 2.5, 5, 10, 20, and 40 μg/mL) for 24 h, and the cell survival rate was measured by the MTS assay kit. All data are presented as mean ± SD. ∗indicates statistical significance between control and PPI-treated groups.
