How to recognize a recognition site for a restriction enzyme
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More than 3000 type II
More than 3000 type II restriction endonucleases have been discovered. They recognize short, usually palindromic, sequences of 4–8 bp and, in the presence of Mg2+, cleave the DNA within or in close proximity to the recognition sequence. The orthodox type II enzymes are homodimers which recognize palindromic sites.
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