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Surviving rad50/rad50 mutant cells present longer telomeres. Southern analysis of MboI-digested DNA using the telomeric repeat probe. DNA was prepared from rad50 heterozygous (+/−) and homozygous (−/−) mutant cells as well as wild-type (+/+) cells after different periods in culture. Positions of molecular weight size markers (in kb) are indicated to the right.
