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PCR‐direct sequencing of c‐Ha‐ras at codon 61 in mras mice. In the tumors of wild‐type littermates and in mras mice after DMBA and TPA treatment, A to T transversion in murine c‐Ha‐ras transgenes at codon 61 were detected (arrows). (a) Non‐neoplastic regions of mras; (b) papilloma in mras; (c) non‐neoplastic regions of wild‐type; (d) papilloma in wild‐type.
