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restriction enzyme
noun
, Biochemistry.
- any of a group of enzymes that catalyze the cleavage of DNA molecules at specific sites: used for gene splicing in recombinant DNA technology and for chromosome mapping.
restriction enzyme
noun
- any of several enzymes produced by bacteria as a defence against viral infection and commonly used to cut DNA for genetic manipulation or diagnosis
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Word History and Origins
Origin of restriction enzyme1
First recorded in 1960–65
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Example Sentences
The host DNA is sliced open, the plasmid is inserted in the gap, and ligases repair the cut made by the restriction enzymes.
From Popular-Science
One hypothesis is that replacing A with Z is a countermeasure against bacterial defense enzymes, known as restriction enzymes, that chop up DNA from invading phages.
From Science News
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