1. Stem Cell Program and Division of Hematology/Oncology, Children’s Hospital Boston, Howard Hughes Medical Institute, Boston, MA 02115, USA.
2. Harvard Stem Cell Institute, Boston, MA 02115, USA.
3. Department of Medical Oncology, Dana-Farber Cancer Institute, Boston, MA 02215, USA.
4. Harvard Medical School, Boston, MA 02115, USA.
5. Institute of Molecular Life Sciences, University of Zürich, 8057 Zürich, Switzerland.
6. Whitehead Institute for Biomedical Research, 9 Cambridge Center, Cambridge, MA 02142, USA.
7. Computational and Systems Biology Program, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.
8. Memorial Sloan Kettering Cancer Center, Weill Cornell Medical College, New York, NY 10075, USA.
9. Massachusetts General Hospital Cancer Center, Harvard Medical School, Charlestown, MA 02129, USA.
10. Research Institute Children’s Cancer Center Hamburg and Department of Pediatric Hematology and Oncology, University Medical Center Hamburg-Eppendorf, 20246 Hamburg, Germany.
11. Department of Stem Cell and Regenerative Biology, Harvard University, Cambridge, MA 02138, USA.
12. Center for Regenerative Medicine, Massachusetts General Hospital, Boston, MA 02114, USA.
13. Department of Biology, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.