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Comparison of cytotoxic effects of ethanolic extract of saffron on lung cancer cell (A549) and non-malignant cell (L929) line. Cells were treated with different concentration of saffron extract for 24 hours. Viability was quantitated by MTT assay. Results are mean ± SEM (n=6). The asterisks are indicator of statistically difference obtained separately at different time points compared to their controls shown in figure as **P <0.01, ***P <0.001
