1. ECVAM, JRC Environment Institute, 21020 Ispra (VA), Italy and Consorzio Milano Ricerche, via Ampere, 20129 Milan, Italy
2. Molecular and Cell Biology, Environment Institute, CIEMAT, Avenida Complutense, 28040 Madrid, Spain
3. Toxicology Research Laboratories, Lilly Research Laboratories, Greenfield, IN 46140, USA
4. Department of Hematology, Aarhus University Hospital, Tage-Hansens Gade, 8000 Aarhus, Denmark
5. BIBRA Toxicology International, Woodmansterne Road, Carshalton, Surrey SM5 4DS, UK
6. Hematology and Clinical Chemistry Section, Toxicology and Safety Assessment Department, Pharmacia, via per Pogliano, 20014 Nerviano, Italy
7. DABAC, University of Tuscia, via S.Camillo De Lellis, 01100 Viterbo, Italy
8. Center for Drug Evaluation and Research, Food and Drug Administration, 8301 Muirkirk Road, Laurel, MD 20708, USA
9. Ecole Superieure de Microbiologic, Université de Bretagne Occidentale, Technopole Brest-Iroise, 29280 Plouzane, France;
10. Cell Culture Laboratory, Institute of Medical Microbiology, University of Milan, via Pascal, 20133 Milan, Italy
11. Advanced Tissue Sciences, 505 Coast Blv. South, La Jolla, CA 92037, USA
12. Department of Environment, VITO — Flemish Institute for Technological Research, Boeretang 200, 2400 Mol, Belgium