TisB-IstR toxin-antitoxin system

The TisB-IstR toxin-antitoxin system is the first known toxin-antitoxin system which is induced by the SOS response in response to DNA damage. == IstR-1 and IstR-2 == IstR sRNA (inhibitor of SOS-induced toxicity by RNA) is a family of non-coding RNA first identified in Escherichia coli.