1. Ciba-Geigy Ltd., Central Research Laboratories, R-1060.2.34, CH-4002 Basel, Switzerland
2. Ciba-Geigy Ltd., Pharmaceutical Division, Department of Oncology, CH-4002 Basel, Switzerland
3. ISIS Pharmaceuticals, Department of Molecular Pharmacology, 2280 Faraday Avenue, Carlsbad, CA 92008, U.S.A.
4. Ciba Geigy Ltd., Pharmaceutical Division, Department of Toxicology, Horsham, West Sussex RH12 4AB, U.K.