The SOS response is a global response to DNA damage in which the cell cycle is arrested and DNA repair and mutagenesis are induced. The system involves the RecA protein (Rad51 in eukaryotes). The RecA protein, stimulated by single-stranded DNA, is involved in the inactivation of the LexA repressor thereby inducing the response. It is an error-prone repair system.
Read more about SOS Response: Discovery, Mechanism, Antibiotic Resistance, Genotoxicity Testing
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“The reason can give nothing at all Like the response to desire.”
—Wallace Stevens (1879–1955)