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Immunohistochemically stained (no counter stain) epidermis from B, revealing a small cluster of p53-immunoreactive keratinocytes found in normal skin after 2 months of total protection from UV radiation. Original low magnification, ×100 (A) and original high magnification ×400 (B). The epidermal p53 clone measures 10 to 15 cells in diameter and is enclosed within an area of 0.05 mm2.
