Fig. 4. Expression levels of exogenous-apoptosis-related proteins in FaDu pharyngeal carcinoma cells treated with betulinic acid. FaDu cells were treated with 0, 10, and 20 μM of betulinic acid for 24 hr. (A) Expression of Fas cleaved caspase-8, an apoptosis-related protein. (B) Quantitative data of (A) were analyzed using Image J. Data are expressed as mean standard deviations from three independent experiments. **p<0.01, ***p<0.001 as compared to controls.
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