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Bcl-2 protein expression in the epidermis of each group, stained by immunohistochemical staining and detected by light microscopy with ×400 magnifications. (A) Control; (B) UVB group; (C) UVB + vehicle group; (D) UVB + 5.0 IU/mL SOP group. (i) 8 h; (ii) 24 h; (iii) 48 h; (iv) 72 h.
