OneTaq Hot Start DNA Polymerase is an optimized blend of Taq and Deep Vent DNA polymerases combined with an aptamer-based inhibitor. The 3' to 5' exonuclease activity of Deep Vent DNA Polymerase increases the fidelity and robust amplification of Taq DNA Polymerase and the hot start formulation combines convenience with decreased interference from primer dimers and secondary products. The OneTaq Reaction Buffers and High GC Enhancer have been formulated for robust yields, regardless of a template's GC content. The inhibitor binds reversibly, blocking polymerase activity at temperatures below 45C. The polymerase is activated during normal cycling conditions, allowing reactions to be set up at room temperature. OneTaq Hot Start DNA Polymerase does not require a separate high temperature incubation step to activate the enzyme and can be used in typical Taq-based cycling protocols. It is supplied with two 5X buffers: (Standard and GC), as well as a High GC Enhancer solution.