1. Department of Cell and Molecular Biology, University of São Paulo School of Medicine, Ribeirao Preto, Brazil
2. Department of Microbiology and Immunology, University Michigan Medical School, Ann Arbor, Michigan, USA
3. Department of Biochemistry, University of São Paulo School of Medicine, Ribeirao Preto, Brazil
4. Department of Microbiology, Institute of Biomedical Sciences, University of São Paulo, São Paulo, Brazil