1. Department of Pathology, University of Brescia, 25123 Brescia, Italy
2. Section of General Pathology and Immunology, University of Brescia, 25123 Brescia, Italy
3. Institut de Recherche Interdisciplinaire en Biologie Humaine et Moléculaire, Campus Erasme, B-1070 Brussels, Belgium
4. Istituto Ricerche Farmacologiche “Mario Negri, ” 20157 Milan, Italy
5. Euroscreen S.A., B-6041 Gosselies, Belgium
6. Centro IDET, Institute of General Pathology, University of Milan, 20133 Milan, Italy