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Three human tumour cell lines (HX142, RT112 and MGH-U1) with different radiosensitivities were tested for differences in the rate and/or extent of DNA unwinding in alkali as well as for differences in the induction of DNA double strand breaks by means of the pulsed field gel electrophoresis, after X-irradiation. Unlike that which has been found using the non-denaturing filter elution technique (NDE,...
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