Hot start DNA polymerase is a modified form of DNA polymerase which avoids a non-specific amplification of DNA by inactivation of the taq polymerase at low temperatures. The polymerase chain reaction (PCR) is a technology in molecular biology used to amplify a single copy or a few copies of a piece of DNA across several orders of magnitude, generating thousands to millions of copies of a particular DNA sequence. In Hot start PCR, specific antibodies are used to block the Taq-polymerase at lower temperature. An initial step at 95℃ is required for denaturing the antibodies linked to the active center of the enzyme. The anti-Taq antibodies reduce the Taq polymerase activity below 72℃, the optimal temperature at which the enzyme extends the primers. When the specific antibodies detach from Taq-polymerase, the amplification proceeds with greater specificity.