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RecBCD enzyme is a heterotrimeric helicase/nuclease that initiates homologous recombination at double-stranded DNA breaks. Several of its activities are regulated by the DNA sequence χ (5′-GCTGGTGG-3′), which is recognized in cis by the translocating enzyme. When RecBCD enzyme encounters χ, the intensity and polarity of its nuclease activity are changed, and the enzyme gains the ability to load RecA...
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