Explain how SOS response help DNA in repairing the damage caused by external agents.

The SOS response is a global regulatory network in bacteria that helps repair DNA damage caused by external agents such as UV radiation, chemical mutagens, and other genotoxic stressors. It is primarily controlled by two key proteins, LexA and RecA, which work together to regulate the expression of DNA repair genes.

Under normal conditions, the LexA protein represses the transcription of SOS genes _______ ____ _________ ______ _____ ___ _____ ________ __________ ______ _________ ____.
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