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PCR, which stands for Polymerase Chain Reaction, is a revolutionary technique used to amplify specific DNA sequences. It allows researchers to rapidly generate millions of copies of a targeted DNA segment from a very small sample.
Imagine a doctor suspects a patient has a bacterial infection. A small swab sample is collected, and the extracted DNA is used in a PCR test targeting a specific bacterial gene. If the target sequence is present, PCR will amplify it to detectable levels, confirming the presence of the bacteria.
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