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Direct strand scission and alkali-labile lesion formation when duplex DNA (13) containing I3 is photolyzed. A. Anaerobic photolysis of 5'-32P-13. B. Aerobic photolysis of 5'-32P-13. dsb, direct strand breaks; NaOH, photolysate treated with 0.1 M NaOH at 37°C; Pip., photolysate treated with 1.0 M piperidine at 90°C.
