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Makes several copies of a specific DNA sequence you're interested in, provides a way to make more copies of a portion of DNA

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• Does not need to happen in a cell, can occur in a test tube

how it works

• what is needed
• 1. denaturation
• 2. annealing
• 3. DNA synthesis
• Finishes with two DNA strands, process can be done again and again

why use PCR?

Products are used as a starting point for other technologies that require several copies of DNA, such as gel electrophoresis

• Diagnosis of a disease caused by a virus