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K‐ras (KRAS) mutations are observed in around 40% of human colorectal adenomas and carcinomas. Previously, we developed and characterized a strain of transgenic mice with inducible intestinal epithelial expression of K‐ras$^{Val12}$ via a Cre/LoxP system. To evaluate the influence of mutant K‐ras on carcinogen‐induced colorectal tumourigenesis, we induced neoplastic alterations in the large intestines...
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