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The effect of ursolic and oleanolic acids on A549 human lung cancer cells viability. A549 cell monolayers were stimulated with several concentrations of ursolic acid (UA) or oleanolic acid (OA) (5, 10, 20, and 40 µg/mL) and trypan blue assay was performed. The results are presented as the means and standard deviation of triplicate experiments * statistically significant differences (p < 0.05) when the stimulated cells were compared with untreated cells (UNS).
