1. Institute of Cell, Animal, and Population Biology, University of Edinburgh, Edinburgh EH9 3JT
2. Centro de Malária e Outras Doenças Tropicais/IHMT, 1349-008 Lisbon, Portugal
3. The Institute for Genomic Research, Rockville, Maryland 20850
4. Wellcome Trust Centre for Cell Biology, University of Edinburgh, Edinburgh EH9 3JR, Scotland
5. Department of Haematological Medicine, King's College Hospital, London SE5 9NU, United Kingdom