1. Institute of Biochemistry and Molecular Biology, ZBMZ, Medical Faculty, University of Freiburg, D-79104 Freiburg, Germany
2. Institute of Biochemistry, Chemical and Pharmaceutical Faculty, University of Freiburg, D-79104 Freiburg, Germany
3. BIOSS Centre for Biological Signaling Studies, University of Freiburg, D-79104 Freiburg, Germany