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Cytotoxic activity of plant extract against different cancer cell lines. Human cancer cells A549 (A), Daudi (B), HeLa (C), and Beas-2B (D) were treated with ethanolic extract from the flowering parts of Centaurea solstitialis for 72 h. Cell viability was determined based on the MTT assay. Data are the means (±standard deviation) of three independent experiments
****: p<0.0001 compared with untreated cells
