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Immunohistochemical staining of a 5-μm section of mouse skin with an anti-active caspase 3 antibody. (a) Skin from a Xpc−/− mock-treated mouse. (b) Skin from a Xpc−/− mouse 6 h after exposure to a single dose of UVB (2,000 J/m2). Apoptotic cells are indicated with arrowheads.
