Abstract
The polymerase chain reaction (PCR) has been extensively used in basic science research, and the clinical potential of PCR is only now beginning to be realized. The PCR is based on the fundamental DNA replication process that occurs in every living cell. PCR is essentially an in vitro adaptation of the in vivo DNA copying process. Because PCR is so efficient at amplifying even picogram quantities of DNA, contamination with even trace amounts of nucleic acids can lead to the generation of unwanted DNA sequences and false-positive test results. Despite this, there has been rapid growth in the use of PCR in biomedical research and clinical diagnostics. PCR is the most sensitive test for herpes simplex virus, varicella-zoster virus, and human papillomavirus infections. Other diagnostic uses, including tests for genetic diseases, cancers, and other infectious diseases, are evolving.
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