Restriction enzyme and DNA

Restriction enzyme and DNA


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Restriction enzyme and DNA. Molecular model showing an EcoRI endonuclease enzyme (purple) bound to a DNA (deoxyribonucleic acid) strand (blue). EcoRI is an enzyme isolated from strains of E. coli bacteria. It is part of the restriction modification (RM) system used by bacteria to protect themselves from foreign DNA, such as that used by bacteriophage viruses. It is used in molecular biology as a restriction enzyme, that is an enzyme that cuts DNA at specific recognition nucleotide sequences known as restriction sites.

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