1. Department of Biomedical Sciences and Consiglio Nazionale delle Ricerche Institute of Neuroscience, University of Padova, 35121 Padova, Italy
2. Department of Biology, Faculte des Sciences de Luminy, 13288 Marseille, cedex 9, France
3. SIBIA Neurosciences, La Jolla, CA 92037
4. Senomyx Inc., La Jolla, CA 92037
5. Neurogenetics Inc., La Jolla, CA 92037
6. Merck Research Labs, San Diego, CA 92121