It was first isolated in 1957 by Arthur Kornberg and colleagues.  
It was first isolated in 1957 by Arthur Kornberg and colleagues.  In 1969, Peter DeLucia and John Cairns reported the discovery of a mutant strain of E. coli that was deficient in it, which they offered as the reason for the strain's inability to repair UV-induced damage.  So far two types of the number one variety have been discovered, and it is known that all three types possess exonuclease activity in the 3 prime to 5 prime direction.  FTP, identify this enzyme that catalyzes, from a template model, the replication of DNA.
It was first isolated in 1957 by Arthur Kornberg and colleagues.  
{DNA polymerase} (accept just {polymerase} after end of question)