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DNA laddering in thymocytes of wild-type and Atm-deficient mice. Freshly isolated thymocytes were plated after either no irradiation (−) or irradiation at 3.5 Gy (+). DNA was prepared either immediately afterward (0) or after 8 hr incubation (8), and 10 μg was electrophoresed through a 1% agarose gel.
