1 Nutrition and Bromatology Group, Department of Analytical and Food Chemistry, Food Science and Technology Faculty, University of Vigo, Ourense Campus, 32004 Ourense, Spain.
2 Department of Microbiology and Biochemistry of Dairy Products, Instituto de Productos Lácteos de Asturias (IPLA-CSIC), 33300 Villaviciosa, Spain.
3 Laboratory of Immunogenetics, Department of Medical Microbiology and Infection Control, VU University Medical Centre, P.O. Box 7057, 1007 MB Amsterdam, Netherlands.
4 Antigen Presentation Research Group, Imperial College London, Northwick Park and St. Mark's Campus, Level 7W St. Mark's Hospital, Watford Road, Harrow HA1 3UJ, UK.