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Cutaneous squamous cell carcinoma (cSCC) tumors in SKH-1 mice induced by ultraviolet (UV) irradiation. (A) Representative photograph of UV-treated SKH-1 hairless mice, inducing cSCC tumors with various sizes. The histological examination showed that a large number of atypical cells (→), keratin pearl (→) in the tissue at 40× (B) and 200× (C), which were the characteristic of cSCC tumors.
