Abstract
The addition of caffeine to the plating medium after thymine deprivation of E. coli WP2 uvr + thyA or WP2 uvrA thyA had no influence on survival. Caffeine, however, reduced the frequency of mutants. The hypothesis is presented that the reduced mutagenesis is due to the sensitivity to caffeine of an inducible error-prone repair mechanism operating during thymine deprivation and after the re-addition of thymine.
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