Abstract
ABSTRACT The rate of pyrimidine dimer excision has been measured in Escherichia coli strains deficient in exonuclease V, exonuclease VII, and the 5′→3′ exonuclease of DNA polymerase I. The results suggest that a reduced level of the 5′→3′ exonuclease of DNA polymerase I diminishes the rate of dimer excision and that an additional deficiency in exonuclease VII causes a significantly greater reduction in the cell's ability to remove dimers.
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