NxGen-phi29 DNA Polymerase, 2,000 UExcellent strand displacement, fidelity and speed. phi29 DNA Polymerase is a highly processive DNA polymerase with a powerful strand displacement activity and a 3 5 proofreading exonuclease function. The enzyme is capable of up to 70,000 insertions per binding event. Unit Definition: 1 unit is defined as the amount of polymerase required to convert 0. 5 pmol of dNTP's into acid insoluble material in 10 minutes at 30C. Source: A recombinant E. coli