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The effect of a thiol, dithiothreitol (DTT), on DNA radiolysis at cryogenic temperatures was investigated by the EPR method. Dithiothreitol repairs up to 30% of DNA radicals, but an increase in the thiol concentration above 10mM, even up to 1000mM, does not further enhance the overall level of the repair process. The transfers of paramagnetic centres from both the guanine radical cation, and the allyl...
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