Author information:
(1)Department of Stem Cell and Regenerative Biology and Harvard Stem Cell 
Institute, Harvard University, Cambridge, MA, USA.
(2)Stem Cell Program and Division of Hematology/Oncology, Boston Children's 
Hospital and Dana Farber Cancer Institute, Howard Hughes Medical Institute, 
Harvard Stem Cell Institute, Harvard Medical School, Boston, MA, USA.
(3)Department of Pediatric Hematology and Oncology, Center for Pediatrics, 
Medical Center-University of Freiburg, Faculty of Medicine, University of 
Freiburg, Freiburg, Germany.
(4)Division of Hematology, Department of Medicine, Brigham and Women's Hospital, 
Harvard Medical School, Boston, MA, USA.
(5)US Fish and Wildlife Service, Private John Allen National Fish Hatchery, 
Tupelo, MS, USA.
(6)Department of Biology, Stanford University, Stanford, CA, USA.
(7)US Geological Survey, Great Lakes Science Center, Hammond Bay Biological 
Station, Millersburg, MI, USA.
(8)Molecular Cell Biology, University of California, Merced, CA, USA.
(9)Cutaneous Biology Research Center, Massachusetts General Hospital and Harvard 
Medical School, Charlestown, MA, USA.
(10)Department of Dermatology, Medical Center-University of Freiburg, Faculty of 
Medicine, University of Freiburg, Freiburg, Germany.
(11)Department of Cellular and Molecular Immunology, Max Planck Institute of 
Immunobiology and Epigenetics, Freiburg, Germany.
(12)Developmental Biology, Faculty of Biology, Centre for Biological Signalling 
Studies (BIOSS), Albert-Ludwigs-University of Freiburg, Freiburg, Germany.
(13)Department of Stem Cell and Regenerative Biology and Harvard Stem Cell 
Institute, Harvard University, Cambridge, MA, USA. zon@enders.tch.harvard.edu.
(14)Stem Cell Program and Division of Hematology/Oncology, Boston Children's 
Hospital and Dana Farber Cancer Institute, Howard Hughes Medical Institute, 
Harvard Stem Cell Institute, Harvard Medical School, Boston, MA, USA. 
zon@enders.tch.harvard.edu.