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UVB-induced skin tumors are well-differentiated SCCs in mouse. (A) Multiple skin tumors were developed by chronic UVB irradiation on the backs of mice. (B) On a random basis, several tumors were excised with a scalpel, and then paraffin blocks were prepared with H&E staining (×400). UVB: ultraviolet B, SCC: squamous cell carcinoma.
