1. R. K. Reinscheid, H.-P. Nothacker, A. Bourson, A. Ardati, R. A. Henningsen, F. J. Monsma Jr., O. Civelli, CNS Research, Pharma Division, Hoffmann-La Roche AG, CH-4002 Basel, Switzerland.
2. J. R. Bunzow and D. K. Grandy, Vollum Institute for Advanced Biomedical Research, Oregon Health Sciences University, Portland, OR 97201, USA.
3. H. Langen, Gene Technologies Research, Pharma Division, Hoffmann-La Roche AG, CH-4002 Basel, Switzerland.