1. Centro de Investigaciones Endocrinologicas, Consejo Nacional de Investigaciones Cientificas y Tecnicas, Buenos Aires (I.A., A.C., M.B.), Buenos Aires 1013, Argentina
2. Section on Pharmacology, National Institute of Mental Health, National Institutes of Health (I.A., Y.N., K.-L.H., J.A.T., A.F.-N., T.I., A.V.J., J.M.S.), Bethesda, Maryland 20814