1. Department of Haematology, University of Cambridge, Cambridge Institute for Medical Research and Wellcome–Medical Research Council Cambridge Stem Cell Institute, Cambridge, United Kingdom;
2. Department of Medicine, Karolinska Institutet and Karolinska University Hospital, Stockholm, Sweden;
3. Department of Haematology, University of Cambridge, Wellcome–Medical Research Council Cambridge Stem Cell Institute, Cambridge, United Kingdom; and
4. Department of Systems Biology, Harvard Medical School, Boston, MA