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Restriction Enzymes

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Restriction enzymes are endonucleases that recognize specific double-stranded DNA sequences and cleave the DNA in both strands, e.g.:
 
(1)
They have been identified in many prokaryotic organisms and are considered to be part of a defense system directed against foreign DNA. Site-specific endodeoxyribonucleases are given EC numbers, e.g., EC 3.1.21.4 for a Type II enzyme (see below) .
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