Figure 4.

UVB irradiation stimulates the expression of tyrosinase protein in human epidermis. A: Western blotting. B: Densitometric analysis. Epidermal sheets after UVB exposure were obtained by suction blister biopsy, followed by Western blotting analysis of tyrosinase protein as detailed in Materials and Methods. The bands show two representatives of Western blotting analyses that were repeated three times with similar results. *, P < 0.05. The values reported represent means ± SD from three experiments.