1. Department of Pharmacology and Physiology; Drexel University College of Medicine; Philadelphia Pennsylvania USA
2. Neurobiology and Venoms Laboratory; Department of Biology; College of Philosophy; Sciences and Literature of Ribeirão Preto; University of São Paulo; Ribeirão Preto SP Brazil
3. Department of Biochemistry and Immunology; Ribeirão Preto School of Medicine; University of São Paulo; SP Brazil