1. Department of Immunology; Nestlé Research Centre; Vers-chez-les-Blanc, Ch-1000 Lausanne 26 Switzerland
2. Center of Intestinal Biology and Disease; University of North Carolina at Chapell Hill; U.S.A.
3. Institute of Biological Chemistry and Nutrition Science; Hohenheim University; Garbenstrasse 28, D-70599 Stuttgart Germany
4. Institute of Food Technology; Hohenheim University; Garbenstrasse 28, D-70599 Stuttgart Germany