President Barack Obama presents the 2009 Presidential Medal of Freedom to Dr. Janet Davison Rowley, M.D. , who discovered the first consistent chromosome translocation in a human cancer, at the White House in Washington, Wednesday, Aug. 12, 2009. Rowley is the Blum Riese Distinguished Service Professor of Medicine, Molecular Genetics & Cell Biology and Human Genetics at the University of Chicago. AP Photo logo AP Photo 30 months ago

President Barack Obama presents the 2009 Presidential Medal of Freedom to Dr. Janet Davison Rowley, M.D. , who discovered the first consistent chromosome translocation in a human cancer, at the White House in Washington, Wednesday, Aug. 12, 2009. Rowley is the Blum Riese Distinguished Service Professor of Medicine, Molecular Genetics & Cell Biology and Human Genetics at the University of Chicago.

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