TaKaRa Ex Taq DNA Polymerase combines the proven performance of Takara Taq polymerase with the proofreading activity of an efficient 3'-to-5' exonuclease,for high-sensitivity, high-efficiency PCR. Ex Taq can also be used for long-range PCR (up to 20 kb from genomic DNA templates and up to 30 kb from lambda DNA templates). Separate tubes of Mg2+ plus buffer and dNTP mix are supplied with the polymerase..