Cre recombinase is an enzyme derived from the P1 bacteriophage, which is a type of virus that infects bacteria. It is widely used in molecular biology for its ability to catalyze site-specific recombination events between specific DNA sequences known as loxP sites (short for "locus of crossing over in P1"). The primary function of Cre recombinase is to facilitate the insertion, deletion, or rearrangement of genetic material.
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