1. Departamento
de Farmacologia, Universidade Federal do Paraná, Curitiba 81.530-980, PR, Brazil
2. Institute
of Biophysics Carlos Chagas Filho and Institute of Medical Biochemistry
Leopoldo de Meis, Federal University of Rio de Janeiro, Rio de
Janeiro, Brazil
3. Department
of Neurologic Surgery, Mayo Clinic, Rochester, Minnesota 55905, United States