1. Laboratory of Gene Technology; Department of Biosystems; KU Leuven; B-3001 Heverlee Belgium
2. Laboratory of Food Microbiology; Department of Microbial and Molecular Systems; KU Leuven; B-3001 Heverlee Belgium
3. Institute of Molecular Systems Biology; ETH Zurich; CH-8093 Zurich Switzerland
4. Institute for Food, Nutrition and Health; ETH Zurich; CH-8092 Zurich Switzerland
5. Biomedical Research Institute; Hasselt University; B-3590 Diepenbeek Belgium
6. Centro de Biologia Molecular ‘Severo Ochoa’; Campus de Cantoblanco; E-28049 Madrid Spain