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  • Polymerase chain reaction (PCR)

    Polymerase chain reaction (PCR)

    Animation

    (54 sec) PCR is a standard laboratory technique that allows amplification of specific segments of DNA based on complementarity.

  • Visualizing Gene-Expression Patterns

    Visualizing Gene-Expression Patterns

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    Learn about the different ways scientists are able to detect when genes are being expressed in various tissues.

  • Polymerase chain reaction

    Polymerase chain reaction

    Animation

    (1 min 28 sec) Polymerase chain reaction, or PCR, is a technique for making many copies of a specific DNA sequence. DNA is repeatedly heated and cooled in the presence of primers that bracket the desired sequence and of the enzyme Tac polymerase. In as few as 30 cycles, a billion copies of the target sequence can be made.