Thermostable DNA polymerase. In addition to polymerase activity, this DNA polymerase exhibits 3' to 5' exonuclease activity. a 2'-deoxyribonucleoside 5'-triphosphate + DNA(n) = diphosphate + DNA(n+1) Binds 2 magnesium ions. DNA polymerase activity strongly inhibited by uracil-containing oligonucleotides. Belongs to the DNA polymerase type-B family. There are conflicts between the sequence shown here and that from PDB 1D5A.