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Deficiency of fragile histidine triad (Fhit) decreases phosphorylated (p) Chk2‐positive cells in N‐nitrosomethyl benzylamine (NMBA)‐induced murine forestomach tumors. Immunohistochemistry was carried out with antibodies against Fhit, pChk2, Chk2, and pCdc25C. Arrow heads indicate the pChk2‐positive cells.
