1. European Molecular Biology Laboratory (EMBL) Cell Biology & Biophysics Unit Meyerhofstr. 1 69117 Heidelberg Germany
2. Faculty of Biosciences Collaboration for Joint Ph.D. Degree between EMBL and Heidelberg University 69117 Heidelberg Germany
3. Oregon Health & Science University Department of Chemical Physiology and Biochemistry 3181 SW Sam Jackson Park Rd Portland OR 97239-3098 USA