General term for any enzyme catalyzing a polymerization, as of nucleotides to polynucleotides, thus belonging to EC class 2, the transferases.
p. alpha a class of mammalian DNA p.'s in the nucleus that function in chromosome replication.polymerase a;
p. beta a class of mammalian DNA p.'s in the nucleus that do not have a role in replication but may function in DNA repair.polymerase beta;
p. gamma a class of mammalian DNA p.'s in the mitochondria responsible for replication of the mitochondrial genome.polymerase gamma;
Taq p. a temperature-resistant DNA polymerase isolated from Thermus aquaticus that can extend primers at high temperatures; used in the p. chain reaction.
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