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The PCR reaction can be used to amplify DNA from all three sources mentioned. PCR relies on the use of short stretches of DNA that are 6 - 12 bases long to attach to the target DNA (the source where the DNA is coming from) so that the polymerase enzyme can make copies of the target DNA.

As long as these primers are available (they can be commercially purchased in many cases), PCR can be carries out on fetal cell DNA and viral DNA.

Fossil DNA however, may have undergone degradation. DNA has to be of a certain purity for PCR to work. If the fossil DNA had degraded or broken down, PCR cannot be carried out.

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