Polymerase chain reaction pcr principle procedure components types and applications by editorial team on january 27 2019 in microbiology virology the polymerase chain reaction pcr is a laboratory technique for dna replication that allows a target dna sequence to be selectively amplified. The pcr technique and its several advanced variants act as powerful tools which enable a multitude of specialized applications which were once deemed impossible by the scientific world . The polymerase chain reaction and its expanding numbers of modifications have become a mainstay in diagnostic and research medicine the technique allows amplification of nucleic acid sequences both for the purposes of disease and pathogen detection and also for the preparation of hybridization probes and sequencing templates
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