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Escherichia coliK–12 strains deleted in the phr gene which encodes the apoenzyme of photolyase show significant residual photoreactivation activity after exposure to high photoreactivating light doses. We show that this photoreactivation of killing is not associated with reversal of pyrimidine dimers and conclude that the effect is probably attributable to the direct photoconversion of the6–4 photoproducts to their Dewar isomers (Type III photoreactivation).
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Husain et al. (1988) studied this question.
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