1. 1Cancer and Blood Disorders Center, Dana-Farber Cancer Institute and Boston Children's Hospital, Harvard Medical School, Boston, Massachusetts.
2. 2Ken Eagle Consulting, Houston, Texas.
3. 3Broad Institute of MIT and Harvard, Cambridge, Massachusetts.
4. 4Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, Texas.
5. 5Division of Hematology/Oncology, Department of Medicine, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, Pennsylvania.
6. 6Howard Hughes Medical Institute, Boston, Massachusetts.