“…Note: The [a-32P]dATP data were corrected for a secondary source of label transfer (see text) which caused the background to increase with apparent first-order kinetics from 0.02% to 0.09% during the chase. (Kaufmann and Littauer, 1969), terminal transferase (Roychoudhury and Kossel, 1971), RNA polymerase (Hurwitz et al, 1972), and mammalian DNA ligase (Bedows et al, 1977).…”