Effects of magnolol on the expression and activation of proteins in UVB-induced photocarcinogenesis in SKH-1 mice. (A) Effects of magnolol on the cleavage of apoptotic proteins. Proteins were isolated from epidermal tissues of mice, lysates were prepared and subjected to Western blot analysis. β-actin was used to verify equal loading of the samples for each membrane. Bands are representative from three experiments. (B) Effects of magnolol pretreatment on the expression of cell cycle proteins. Proteins were extracted from the mice's back skin as mentioned in materials and methods. Lysates were subjected to Western blot analysis. β-actin was used as loading control. Bands are representative from three experiments.