Restriction site

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Restriction sites (also known as restriction recognition sites) are specific base sequences in DNA, normally 4-8 base pairs in length, found at specific locations on the DNA molecule. Restriction endonucleases recognise these specific sequences in their target DNA and cleave the DNA at these points. Restriction sites differ for each restriction enzyme, and so produce segments of different lenth, sequence and strand orientation (5' or 3').

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