http://openpcr.org/the-machine/
http://openpcr.org/use-it/

PCR is a relatively simple and inexpensive tool that you can use to focus in on a segment of DNA and copy it billions of times over. So, even with a small DNA sample, such as from spitting in a tube, or tearing off a piece of a leaf of lettuce, PCR allows to you make a bunch of copies of the DNA so you have enough to analyze. PCR is used every day to diagnose diseases, identify bacteria and viruses, match criminals to crime scenes, and in many other ways.

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