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Autoradiogram of DNA(1) or AQ-DNA(1) hybridized with 32P-5′-labeled DNA(2) irradiated at 350 nm in a Rayonet photoreactor (16 lamps, 4 h, 25°C). Lanes: 1, DNA(1)/DNA(2), no irradiation; 2, same as lane 1, with irradiation; 3, same as lane 2, with piperidine treatment (30 min, 90°C); 4, AQ-DNA(1)/DNA(2), no irradiation; 5, same as lane 4, with irradiation; 6, same as lane 5, with piperidine treatment; 7, same as lane 5, with Fpg treatment (10 μg/ml, 30 min, 37°C).
