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Periodical. Baxt, W. G., and Sol Spiegelman. "Nuclear DNA Sequences Present in Human Leukemic Cells and Absent in Normal Leukocytes." Proceedings of the National Academy of Sciences of the United States of America 69, 12 (December 1972): 3737-3741. Article. 6 Images.. Proceedings of the National Academy of Sciences of the United States of America