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Photographs of representative lungs (n = 4) of mice injected i.v. with tumor-derived cell lines expressing V12S35 Ras (A), V12G37 Ras (B), and V12C40 Ras (C) after 4 weeks. The values in each panel represent the mean number of metastatic lesions observed at necropsy. (Bar = 0.5 cm.)
