<unk>  is the region in the promoter of various genes to which the LexA repressor binds to repress the transcription of<unk> -induced proteins. This occurs in the absence of DNA damage. In the presence of DNA damage the binding of LexA is inactivated by the RecA activator.<unk> es differ in DNA sequences and binding affinity towards LexA from organism to organism. Furthermore,<unk> es may be present in a dual fashion, which indicates that more than one<unk>  can be within the same promoter.
SOS box
ACDC 
Rc-o319
MRNA-5671
CoWIN
Merosome
CURB-65
C-KAD