1. Federal University of S�o Jo�o del-Rei, 35501296 Divin�polis, MG, Brazil
2. Department of Biochemistry and Immunology, Ribeir�o Preto Medical School, University of S�o Paulo, 14049-900 Ribeir�o Preto, SP, Brazil
3. Department of Pathological Sciences, Biological Sciences Center, State University of Londrina, 86057-970 Londrina, PR, Brazil