TOOLS Taq Plus Polymerase is a thermostable DNA polymerase that exhibits a 5 '→3 'polymerase activity and a 5 '→3 'exonuclease activity, with no 3 '→5 'exonuclease activity. Taq Plus Polymerase is purified from an Escherichia coli (E.coli) strain overexpressing the gene of Thermus aquaticus DNA Polymerase. No endonuclease, exonuclease, or bacterial DNA were detected in this kit. The PCR products contain A at the 3'-end and can be directly cloned into TA-Vectors.