1. Molecular Medicine Unit, UCL Institute of Child Health, London WC1N 1EH,UK.
2. The Randall Centre of Cell and Molecular Biophysics and The Cardiovascular Division, King's College, London SE1 1UL, UK.
3. Molecular Haematology and Cancer Biology Unit, UCL Institute of Child Health,London WC1N 1EH, UK.
4. Bloomsbury Centre for Bioinformatics, Department of Computer Science,University College London, Gower Street, London WC1E 6BT, UK.
5. Department of Genetics and Tumor Cell Biology, St Jude Children's Research Hospital, 332 N. Lauderdale, Memphis, TN 38105, USA.
6. Division of Haematology, The Hanson Institute, Adelaide, South Australia 5000,Australia.
7. Institute of Biosciences and Technology, Texas A&M University Health Science Center, Houston, TX 77030, USA.
8. Massachusetts General Hospital Cardiovascular Research Center, Boston, MA 02114, USA.
9. Department of Cell Biology, Harvard Medical School, and the Harvard Stem Cell Institute, Cambridge, MA 02138, USA.