[1] Childrens Hosp Boston, Howard Hughes Med Inst, Stem Cell Program, Boston, MA 02115 USA
[2] Childrens Hosp Boston, Howard Hughes Med Inst, Div Hematol Oncol, Boston, MA 02115 USA
[3] Harvard Stem Cell Inst, Boston, MA 02115 USA
[4] Dana Farber Canc Inst, Dept Med Oncol, Boston, MA 02215 USA
[5] Harvard Univ, Sch Med, Boston, MA 02115 USA
[6] Univ Zurich, Inst Mol Life Sci, CH-8057 Zurich, Switzerland
[7] Whitehead Inst Biomed Res, 9 Cambridge Ctr, Cambridge, MA 02142 USA
[8] MIT, Computat & Syst Biol Program, 77 Massachusetts Ave, Cambridge, MA 02139 USA
[9] Weill Cornell Med Coll, Mem Sloan Kettering Canc Ctr, New York, NY 10075 USA
[10] Harvard Univ, Massachusetts Gen Hosp, Sch Med, Ctr Canc, Boston, MA 02129 USA
[11] Childrens Canc Ctr Hamburg, Inst Res, D-20246 Hamburg, Germany
[12] Univ Med Ctr Hamburg Eppendorf, Dept Pediat Hematol & Oncol, D-20246 Hamburg, Germany
[13] Harvard Univ, Dept Stem Cell & Regenerat Biol, Cambridge, MA 02138 USA
[14] Massachusetts Gen Hosp, Ctr Regenerat Med, Boston, MA 02114 USA
[15] MIT, Dept Biol, 77 Massachusetts Ave, Cambridge, MA 02139 USA