1. Laboratory of Food Chemistry, Katholieke Universiteit Leuven, Kasteelpark Arenberg 20, B-3001 Leuven, Belgium.
2. Corresponding author. E-mail: katie.vandenbulck@agr.kuleuven.ac.be
3. Laboratory of Molecular Immunology, Katholieke Universiteit Leuven, Minderbroedersstraat 10, B-3000 Leuven, Belgium.
4. Biomedical Research Institute, Limburgs Universitair Centrum, Universitaire Campus, B-3590 Diepenbeek, Belgium.
5. Department of Biochemistry and Molecular Biology, Oklahoma State University, Noble Research Center 246, Stillwater, OK 74078-3035.