Abstract: This invention provides compositions comprising a thermostable non-proofreading DNA polymerase, a thermostable proofreading DNA polymerase, and a factor that substantially inhibits the incorporation of undesired nucleotides or analogs thereof into a DNA polymer. The compositions may further comprise a buffer that enhances a polymerization reaction involving DNA polymerases. The invention also provides various methods of amplifying, synthesizing, or mutagenizing nucleic acids of interest using these novel compositions. Kits that comprise the compositions are also provided for amplifying, synthesizing, and mutagenizing nucleic acids.

Abstract: This invention provides compositions comprising a thermostable non-proofreading DNA polymerase, a thermostable proofreading DNA polymerase, and a factor that substantially inhibits the incorporation of undesired nucleotides or analogs thereof into a DNA polymer. The compositions may further comprise a buffer that enhances a polymerization reaction involving DNA polymerases. The invention also provides various methods of amplifying, synthesizing, or mutagenizing nucleic acids of interest using these novel compositions. Kits that comprise the compositions are also provided for amplifying, synthesizing, and mutagenizing nucleic acids.