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Representive histology of the effects of vehicle (A), tazarotene (B), ATRA (C), RARα agonist (D), RXR agonist (E), or RAR antagonist (F) on UV-irradiated Ptch1 +/− dorsal back skin at age 9 months. Microscopic BCC lesions were stained blue for β-galactosidase activity (arrows).
