Facultad de Ciencias Biologicas, Departamento de Genetica Molecular y Microbiologia, Pontificia Universidad Catolica de Chile, Alameda 340, Molecular Bioinformatics Laboratory, Millennium Institute on Immunology and Immunotherapy, Santiago, Chile and Division of Informatics, Department of Pathology, University of Alabama at Birmingham, 619 19 st. south, Birmingham, AL 35249, USA.