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In biotechnology, bioengineering, and molecular genetics, multiple cloning sites are a feature that allows for the insertion of foreign DNA without damaging the rest of the plasmid. Only one direction of ligation is conceivable if the DNA is cut with two distinct enzymes at the ends. This is true since each end would require a different ligation sequence. Restrictions enzymes are used to cut the plasmid (blue, backbone) and the DNA sequence of interest (green, insert) to provide compatible overhangs that enable them to bind. Covalent connections between the insert and backbone are created via ligase.
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