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  1. Polymerase chain reaction - Wikipedia

  2. Polymerase chain reaction (PCR) (article) | Khan Academy

  3. Polymerase chain reaction (PCR) | Definition & Steps | Britannica

  4. Polymerase Chain Reaction (PCR) Fact Sheet - National Human …

  5. Polymerase Chain Reaction (PCR) - StatPearls - NCBI Bookshelf

  6. Polymerase Chain Reaction (PCR) - National Human Genome …

  7. polymerase chain reaction / PCR | Learn Science at Scitable

  8. The Biotechnology Revolution: PCR and Cloning Expressed Genes

  9. Explainer: How PCR works - Science News Explores

  10. Polymerase chain reaction (PCR) (video) | Khan Academy