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Periodical. Axel, R., S. C. Gulati, and Sol Spiegelman. "Particles Containing RNA-Instructed DNA Polymerase and Virus-Related RNA in Human Breast Cancers." Proceedings of the National Academy of Sciences of the United States of America 69, 11 (November 1972): 3133-3137. Article. 5 Images.. Proceedings of the National Academy of Sciences of the United States of America