Effects of α-santalol on p21 and p53 in UACC-62 cells. (A). Protein levels of p21 and p53 after α-santalol treatment in UACC-62 cells were evaluated by Western blotting. Cell cycle distribution in (B) p21 siRNA and (C) p53 siRNA transfected UACC-62 cells was analyzed by flow cytometer. Data were summarized and presented as the mean ± SD of three observations. For each p21 siRNA or p53 siRNA transfection in UACC-62 cells, Western blotting was performed to ensure the inhibition of p21 or p53 protein expressions.