1. Laboratory of Pharmacology, School of Pharmaceutical Sciences, São Paulo State University
2. Programa de Pós-Graduação em Ciências Fisiológicas, UFSCar/Convênio UNESP. Received April 28, 2007
3. Laboratory of Neuropsychopharmacology, Institute of Biomedical Sciences, University of São Paulo
4. Department and Institute of Psychiatry, University of São Paulo Medical Center