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Relative cell viability after culturing A549 cells with different concentrations of PVP varying from 0, 0.5, 1.0, 2.0, 5.0, to 10.0% for 24 h at 37 °C. After the addition of MTT reagent and 4 h incubation at 37 °C, stop solution was added and followed by overnight incubation. The absorbance of each sample was recorded at 560 nm to determine the cell proliferation rate.
