1. CNRS EP612 Faculté de Pharmacie, 34060 Montpellier,1
2. CRBM, CNRS UPR1086, 34293 Montpellier Cedex 5, 2 and
3. Imperial Cancer Research Fund, London W2CA 3PX, United Kingdom 3 ; and
4. INSERM U326 Hôpital Purpan, 31059 Toulouse, 4 France;
5. SUGEN Inc., Redwood City, California 940635