[1] Novartis Pharma AG, CH-4002 Basel, Switzerland
[2] Hlth Canada, Safe Environm Programme, Ottawa, ON K1A 0L2, Canada
[3] US EPA, Off Res & Dev, Washington, DC 20460 USA
[4] Merck Res Labs, W Point, PA 19486 USA
[5] Natl Inst Hlth Sci, Div Genet & Mutagenesis, Tokyo 158, Japan
[6] Fed Inst Drugs & Med Devices, Bonn, Germany
[7] Covance Labs Ltd, Harrogate, England
[8] US FDA, Natl Ctr Toxicol Res, Rockville, MD 20857 USA
[9] Univ Coll Swansea, Ctr Mol Genet & Toxicol, Swansea, W Glam, Wales
[10] Hlth & Safety Execut, Bootle, Merseyside, England
[11] Food & Drug Safety Ctr, Hatano Res Inst, Kanagawa, Japan
[12] GlaxoSmithKline, Ware, Herts, England
[13] Kwansei Gakuin Univ, Sch Sci & Technol, Dept Biosci, Sanda, Japan