AmpFi HS DNA PolymeraseStore at 20C. AmpFi HS DNA Polymerase has rapid extension rates and contains a proprietary antibody that blocks polymerase activity at low temperatures. HotStart allows for a reaction set up at room temperature without non specific amplification and primer dimer formation. This polymerase provides increased processivity, yields, and sensitivity, and reduced reaction times by up to 70%, compared to wild type Taq DNA polymerase when conditions are