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BREX protein BrxB This family includes BREX protein BrxB from Bacillus cereus, which is part of a type 1 BREX (bacteriophage exclusion) system, a system that provides immunity against bacteriophage, which allows phage adsorption but prevents phage DNA replication, without degradation of the phage DNA. The exact function of BrxB is not clear.
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