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Effects of K-ras heterozygosity on the survival of Rb+/− mice. Progeny arising from Rb+/− × K-ras+/− intercrosses were aged together. Shown are survival curves for Rb+/− K-ras+/+ (n = 44) and Rb+/− K-ras+/− (n = 48) mice. Percent survival represents the percentage of the initial starting population surviving at a given age (in days) for the indicated genotype. Median survival is indicated.
