POLYMERASE CHAIN REACTION (PCR)

1. A laboratory process that selects a DNA segment from a mixture of DNA chains and rapidly replicates it; used to create a large, readily analyzed sample of a piece of DNA. It is used in DNA fingerprinting and in medical tests to identify diseases from the infectious agent's DNA. See also DNA. 2. As related to HIV: A sensitive laboratory technique that can detect and quantify HIV in a person's blood or lymph node.
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