Abstract: The present invention relates to a family B polymerase enzyme comprising the following mutations, a mutation in the motif A region, wherein a threonine is the second amino acid of the motif A region, wherein the motif A region is homologous to amino acids 408 to 410 in 9° N, a mutation leading to a reduction or elimination of the 3?-5? exonuclease activity if present in said family B polymerase, wherein said polymerase additionally comprises one or both of the following mutations in the motif A region, L408Y or L408F and/or P410S or P410G. It may be used in DNA sequencing and may be present in a kit.

Abstract: The present invention relates to a family B polymerase enzyme comprising the following mutations, a mutation in the motif A region, wherein a threonine is the second amino acid of the motif A region, wherein the motif A region is homologous to amino acids 408 to 410 in 9° N, a mutation leading to a reduction or elimination of the 3?-5? exonuclease activity if present in said family B polymerase, wherein said polymerase additionally comprises one or both of the following mutations in the motif A region, L408Y or L408F and/or P410S or P410G. It may be used in DNA sequencing and may be present in a kit.