1. Division of Neuroscience (G.A.D., D.F.H., M.E.C., S.R.O.), Oregon Regional Primate Research Center-Oregon Health Sciences University, Beaverton, Oregon 97006-3448
2. Laboratory of Neurobiochemistry, Faculty of Chemistry and Pharmaceutical Sciences (H.E.L., A.P.) Universidad de Chile, Santiago Chile
3. Faculty of Medicine (V.L.), Universidad de Chile, Santiago Chile
4. Center of Molecular Biology Severo Ochoa (A.M.S.), Autonomous University of Madrid, 28049 Cantoblanco, Spain