1. Department of Applied Bioscience, Federal Institute of Technology (ETH) Zürich, Winterthurer Str. 190, 8057 Zürich, Switzerland
2. Division of Preclinical Research, Boehringer Ingelheim Pharma AG, 88397 Biberach, Germany
3. Institute of Biochemistry, University of Leipzig, Talstr. 33, 04103 Leipzig, Germany