1. Qualitas, Danworth Lane, Hurstpierpoint, West Sussex BN6 9LN, UK;
2. Institute for In Vitro Science, 21 Firstfield Road, Suite 220, Gaithersburg, MD 20878, USA;
3. ECVAM, Institute for Health and Consumer Protection, European Commission Joint Research Centre, 21020 Ispra (VA), Italy;
4. Charles University Faculty of Medicine, Simkova 870, Hradec Králové, Czech Republic;
5. FRAME Alternatives Laboratory, University of Nottingham Medical School, Queen's Medical Centre, Nottingham NG7 2UH, UK;
6. RCC Cytotest Cell Research, In den Leppsteinwiessen 19, 64380 Rossdorf, Germany;
7. Human and Environmental Safety Division, The Procter and Gamble Company, Cincinnati, OH, USA;
8. ZEBET, BgVV, Diedersdorfer Weg 1, 12277 Berlin, Germany;
9. Genetic and In Vitro Toxicology, Janssen Pharmaceutica, Turnhoutse Weg 30, 2340 Beerse, Belgium