1. The Norwegian Crop Research Institute, Apelsvold Research Station Div. Kise, N-2350 Nes, Norway
2. Department of Anatomy, Akita University School of Medicine, Akita 010-8543, Japan
3. Minophagen Pharmaceutical Company, Tokyo 160-0004, Japan
4. Institute for Nutrition Research, Faculty of Medicine, University of Oslo, Blindern, 0316 Oslo, Norway