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LexA and RecA play a crucial role in SOS response in Escherichia coli. In classical SOS response, LexA functions as a repressor to regulate the expression of many genes including RecA after DNA damage occurs. Previous studies showed that LexA1 or LexA2 is not involved in RecA induction in Deinococcus radiodurans. In this study, we constructed a double mutant of lexA1 and lexA2. Results showed that...
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