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polymerase chain reaction
(Biochemistry) polymerase chain reaction: a technique for rapidly producing many copies of a fragment of DNA for diagnostic or research purposes
pol′ymerase chain′ reac`tion
the laboratory production of numerous copies of a gene by separating the two strands of the DNA containing the gene segment, marking its location with a primer, and using a DNA polymerase to assemble a copy alongside each segment and continuously copy the copies. Abbr.: PCR