1. Institute of Food, Nutrition and Health; ETH Zurich; 8092 Zurich Switzerland
2. Institut de Physique des Systèmes Biologiques; EPF Lausanne; 1015 Lausanne Switzerland
3. Division of Gene Technology; Katholieke Universiteit Leuven; 3001 Leuven Belgium
4. Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry; 117997 Moscow Russia