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The bacterial SOS DNA repair system (35). DNA damage is sensed by RecA, which induces autocleavage of the repressor LexA. LexA binds to the promoters of the SOS operons, including its own promoter and that of RecA. This study attempts to assign effective parameters (βi and ki) to the arrows representing transcriptional regulation of the various operons. ssDNA, single-stranded DNA.
