1. Institute of Microbiology; Eidgenössische Technische Hochschule (ETH) Zurich; Vladimir-Prelog-Weg 4 8093 Zurich Switzerland
2. Graduate School of Pharmaceutical Sciences; Tohoku University; Aoba-yama, Aobaku Sendai Japan
3. Laboratory of Physical Chemistry; ETH Zürich; Vladimir-Prelog-Weg 2 8093 Zurich Switzerland