1. Centre of Microbial and Plant Genetics, KU Leuven, Kasteelpark Arenberg 22, B-3001 Leuven, Belgium
2. VIB-KU Leuven Center for Microbiology, Bioincubator, Gaston Geenslaan 1, B-3001 Leuven, Belgium
3. Institute of Biology Leiden, Faculty of Science, Leiden University, Sylviusweg 72, 2333 BE Leiden, The Netherlands