Bert Verbinnen1, Kris Covens2, Xavier Bossuyt3. 1. Experimental Laboratory Immunology, Faculty of Medicine, University of Leuven, Herestraat 49 bus 7003, Leuven B-3000, Belgium; PharmAbs, The KULeuven antibody centre, University of Leuven, Herestraat 49 bus 824, Leuven B-3000, Belgium. 2. PharmAbs, The KULeuven antibody centre, University of Leuven, Herestraat 49 bus 824, Leuven B-3000, Belgium; Center for Molecular and Vascular Biology, Faculty of Medicine, University of Leuven, Herestraat 49 bus 911, Leuven B-3000, Belgium. 3. Experimental Laboratory Immunology, Faculty of Medicine, University of Leuven, Herestraat 49 bus 7003, Leuven B-3000, Belgium; PharmAbs, The KULeuven antibody centre, University of Leuven, Herestraat 49 bus 824, Leuven B-3000, Belgium. Electronic address: Xavier.Bossuyt@uzleuven.be.