Fig. 6. Betulinic acid induces FaDu carcinoma cell death through extrinsic and intrinsic apoptosis mechanisms. (A) Expression of apoptosis-related proteins, cleaved caspase-3 and poly (ADP-ribose) polymerase (PARP). (B) Quantitative data from (A) were analyzed using Image J. Data are expressed as the mean standard deviation of three independent experiments, **p<0.01, ***p<0.001 compared to the control group.
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