1. Department of Medical and Molecular Parasitology, New York University School of Medicine, 341 East 25th Street, New York, NY 10010, USA.
2. Département d'Epidémiologie des Affectations Parasitaires, Faculté de Médecine, de Pharmacie et d'Odonto-Stomatologie, Boite Postale 1805, Bamako, Mali.
3. Fred Hutchinson Cancer Research Center, 1100 Fairview Avenue North, Seattle, WA 98109, USA.
4. European Molecular Biology Laboratories, Meyerhofstrasse 1, 69117 Heidelberg, Germany.
5. Howard Hughes Medical Institute, 4000 Jones Bridge Road, Chevy Chase, MD 20815, USA.