[1] Katholieke Univ Leuven, Food Chem Lab, B-3001 Louvain, Belgium
[2] Katholieke Univ Leuven, Lab Mol Immunol, B-3000 Louvain, Belgium
[3] Limburgs Univ Ctr, Biomed Res Inst, B-3590 Diepenbeek, Belgium
[4] Oklahoma State Univ, Dept Biochem & Mol Biol, Noble Res Ctr 246, Stillwater, OK 74078 USA