1. Institut de Recherche en Biologie Humaine et Moléculaire, B-1070 Brussels, Belgium
2. Euroscreen s.a., B-6041 Gosselies, Belgium
3. Istituto di Ricerche Farmacologiche Mario Negri, 20157 Milan, Italy
4. Micromass Ltd., Manchester M23 9LZ, United Kingdom
5. Department of General Pathology, University of Milan, 20123 Milan, Italy
6. Section of General Pathology and Immunology, University of Brescia, 25123 Brescia, Italy