Fig. 2. Effect of betulinic acid on cell viability in FaDu pharyngeal carcinoma cells. The effect of betulinic acid on the viability of FaDu cells was assessed by MTT assay. The percentage of cell viability was calculated as the ratio of A570 nms of betulinic acid treated cells and untreated control cells. Each data point represents the mean±standard error of the mean of four experiments. **p<0.01 vs. control and ***p<0.001 vs. control (control cells measured in the absence of betulinic acid).
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