1. Axis-Shield ASA, Ulvenveien 87, PO Box 206 Økern, N-0510 Oslo, Norway
2. Division of Hematology/Oncology, State University of New York, Health Science Center, Brooklyn, NY 11203
3. Protein Chemistry Laboratory, Department of Molecular and Structural Biology, University of Aarhus, Science Park, Gustav Wieds Vej 10, 8000 Aarhus C, Denmark