1. MRC Experimental Embryology and Teratology Unit, St. George's Hospital Medical School, Cranmer Terrace, London SW17 ORE, UK
2. ZEBET, BgVV, Diedersdorfer Weg 1, 12277 Berlin, Germany
3. Sandoz Pharma Limited, Drug Safety Assessment, 4002 Basle, Switzerland
4. Bristol-Myers Squibb, Pharmaceutical Research Institute, 6000 Thompson Road, Syracuse, NY 13221, USA
5. SmithKline Beecham Consumer Healthcare, St George's Avenue, Weybridge, Surrey KT13 ODE, UK
6. Department of Histology and Embtyology, 3rd Medical Faculty, Charles University, Ruska 87, 100 00 Prague 10, Czech Republic
7. Freie University of Berlin, Institute for Toxicology and Embryopharmacology, Garystrasse 5, 1000 Berlin 33, Germany
8. GlaxoWellcome Research and Development, Genetic and Reproductive Toxicology, Ware, Herts. SG12 0DP, UK
9. Huntingdon Research Centre, Department of Toxicology, Huntingdon, Cambs. PE18 6ES, UK
10. Rhône-Poulenc Rorer, Drug Safety NW 9, 500 Arcola Road, Collegeville, PA 19426-0107, USA
11. Rhône-Poulenc, Secteur Agro, 06903 Sophia Antipolis Cedex, France
12. BgVV, Thielallee 88-92, 14191 Berlin, Germany
13. National Institute of Public Health, Department of Environmental Medicine, Geitmyrsveien 75, 0462 Oslo 4, Norway