It is an enzyme with the function of reconstructing DNA chain, which is rich in nucleic acid on the 3' side of DNA. In the PCR reaction, the process uses high temperature, which requires high heat-resistant enzymes without deterioration. At present, the enzyme extracted from heat-resistant bacteria, namely Thermus aquaticus, is a bacterium that depends on hot springs, and the obtained enzyme is called Taq DNA polymerase.
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