1. Departamento de Microbiologia, Instituto de Ciencias Biomedicas, Universidade de Sao Paulo, Rua Professor Lineu Prestes, 1374 Sao Paulo, Brazil
2. Department of Cellular and Structural Biology, The University of Texas Health Science Center at San Antonio, 7703 Floyd Curl Drive, San Antonio, TX 78229, USA
3. Department of Microbiology and Immunology, The University of Texas Health Science Center at San Antonio, 7703 Floyd Curl Drive, San Antonio, TX 78229, USA