PCR amplifies DNA in a three-step process: denaturation, which melts double-stranded DNA into single strands; annealing, which lets small pieces of primer DNA bind to either side of the region of ...

Prior to the development of PCR in the 1980s, the primary method for producing many copies of a gene was a relatively time-consuming process known as DNA cloning. This technique involved insertion ...

New high-tech Covid-19 tests promise better and earlier detection of the virus—similar to a PCR test ... In creative and humorous videos, WSJ senior personal tech columnist Joanna Stern explains ...