Phusion High-Fidelity DNA Polymerase offers high fidelity and robust performance, and thus can be used for all PCR applications. Its unique structure, a novel Pyrococcus-like enzyme fused with a processivity-enhancing domain, increases fidelity and speed. It is an ideal choice for cloning and can be used for long or difficult amplicons. With an error rate 50-fold lower than that of Taq DNA Polymerase and 6-fold lower than that of Pyrococcus furiosus DNA Polymerase, Phusion is one of the most accurate thermostable polymerases available. Phusion DNA Polymerase possesses 5' to 3' polymerase activity, 3' to 5' exonuclease activity and will generate blunt-ended products. Phusion Hot Start Flex 2X Master Mix offers robust high fidelity performance and room temperature reaction setup with the addition of an aptamer-based inhibitor. The formulation is supplied at a 2X concentration and contains dNTPs and Mg++, requiring only the addition of primers and DNA template for robust amplification.