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Periodical. Richardson, Charles C., I. Robert Lehman, and Arthur Kornberg. "A Deoxyribonucleic Acid Phosphatase-Exonuclease from Escherichia coli. II. Characterization of the Exonuclease Activity." Journal of Biological Chemistry 239, 1 (January 1964): 251-258. Article. 8 Images.. Journal of Biological Chemistry