Abstract
Although the relative incorporation of incorrect nucleotide (dCTP or dGTP) into poly(dA-dT)·poly(dA-dT) by partially purified 3–4S DNA polymerase from normal or leukaemic human cells was four to five times higher than that by the 6–7S DNA polymerase, no significant differences in the infidelity of these polymerases between normal and leukaemic cells were noted.