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HE staining xenografted tumors in nude mice. (a) Tumors from N-nitrosopyrrolidine (NPYR) transformed pWPI H8 cells showed squamous cell carcionoma (SCC) with a better differentiation. (b) Tumors from NPYR transformed pWPI-hId H8 cells showed SCC with undifferentiated or low-grade differentiated type. (c) Tumors formed by SiHa cells showed SCC with undifferentiated type. Representative images (100× and 400× for the inserts) are shown.
