<human>:  Who invented the Polymerase chain reaction?
<bot>: That would be a group of scientists led by Kary Mullis. The Polymerase chain reaction (PCR) is a process that makes many copies of a section of DNA, or a specific sequence of DNA, using the DNA polymerase enzyme. The process is used to amplify specific sections of DNA, making it easier to study. PCR is used in many applications, including cloning, forensic analysis, and genetic testing.