1. Laboratory of Biochemistry, Superior School of Medicine, National Polytechnic Institute, Mexico City 11340, Mexico
2. Laboratory of Mucosal Immunology, Superior School of Medicine, National Polytechnic Institute, Mexico City 11340, Mexico
3. Laboratory of Immunonutrition, Postgraduate Studies and Research Section, Superior School of Medicine, National Polytechnic Institute, Mexico City 11340, Mexico
4. Department of Biological Systems, Metropolitan Autonomous University, Mexico City 04960, Mexico