An engineer at the Lawrence Livermore National Laboratory in California has made a silicon chip which can copy pieces of DNA. It employs a technique called PCR (polymerase chain reaction) which recently won its inventors the Nobel Prize. The chip could replace a much more expensive machine the size of a desktop computer. PCR is used to multiply DNA from tiny samples, such as a hair or drop of blood, for use in genetic fingerprinting and other DNA sequencing techniques.
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