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Kinetics of UV-induced DNA degradation in various E. coli strains. Cells were pretreated with [3H]thymidine, irradiated with 50 J/m2 of UV light, and then grown in nonradioactive medium. Samples were withdrawn at the indicated times, and the amounts of acid-precipitable 3H were determined. The values are averages of two or three independent measurements, with error bars representing standard deviations.
