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Effects of blue light irradiation on nonmelanoma skin cancer. (A) Representative example of each group showing macroscopic photographs of the dorsal skin. The number of tumors (B) and area per tumor (C) are shown. Dorsal skin levels of Ki-67 (D) and Cyclin D (E) were measured. Values are expressed as the means ± standard deviation (SD) derived from five animals. ** p < 0.01.
