1. Texas Biomedical Research Institute, San Antonio, Texas, USA
2. Animal Health Research Centre, Centro Nacional Instituto de Investigación y Tecnología Agraria y Alimentaria, Madrid, Spain
3. Departamento de Biotecnología, Instituto Nacional de Investigación y Tecnología Agraria y Alimentaria, Madrid, Spain
4. Department of Microbiology, Immunology & Molecular Genetics, University of Texas Health Science Center at San Antonio, San Antonio, Texas, USA
5. Department of Biochemistry and Structural Biology, University of Texas Health Science Center at San Antonio, San Antonio, Texas, USA
6. Department of Immunology and Microbiology, The Scripps Research Institute, La Jolla, California, USA