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Immunohistochemical evaluation of serial stored paraffin sections from 42 keratoacanthomas and 11 squamous cell carcinomas demonstrated that skin tumors from UVB-exposed mice showed an inverse relationship (>95%) between p53 protein expression and phospho-Chk1 (Ser317), but not phospho-Chk1 (Ser345) protein expression. Tumors expressing high levels and large areas of p53 protein had no detectable...
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