Bacteriophage T4 DNA Polymerase is a DNA-directed 5’ to 3’ DNA polymerase. It is the product of gene 43 from bacteriophage T4 and is therefore often referred to as T4 gp43 DNA Polymerase. The enzyme catalyzes the polymerization of deoxynucleotide triphosphates in a 5’ to 3’ direction. It possesses very active 3’ to 5’ exonuclease activity that is more active on single than double stranded DNA, T4 DNA polymerase has no 5’ to 3’ exonuclease activity. For polymerase activity the enzyme requires DNA with a 5’ protruding end and a high concentration of TruePure™ dNTPs.