Restriction site

In molecular biology, restriction sites, or restriction recognition sites, are regions of a DNA molecule containing specific (4-8 base pairs in length) sequences of nucleotides; these are recognized by restriction enzymes, which cleave the DNA at or near the site. These are generally palindromic sequences (because restriction enzymes usually bind as homodimers), and a particular restriction enzyme may cut the sequence between two nucleotides within its recognition site, or somewhere nearby.

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