SOS DNA repair system in E.coli. SOS DNA repair system in E.coli (-| means inhibition and → means activation). When DNA damage occurs, the RecA protein becomes activated and mediates cleavage of the LexA protein. The repair system is activated by a drop in LexA concentration.
Hsiao and Lee BMC Bioinformatics 2012 13(Suppl 7):S8 doi:10.1186/1471-2105-13-S7-S8