1 Immunology Unit, Department of Biomedical Sciences, Institute of Tropical Medicine, Nationalestraat 155, Antwerp B-2000, Belgium; Department of Biomedical Sciences, University of Antwerp, Universiteitsplein 1, Antwerpen, Belgium.
2 Immunology Unit, Department of Biomedical Sciences, Institute of Tropical Medicine, Nationalestraat 155, Antwerp B-2000, Belgium; Department of Biomedical Sciences, University of Antwerp, Universiteitsplein 1, Antwerpen, Belgium. Electronic address: lkestens@itg.be.