1. Department of Chemistry and Center for Integrated Protein Science (CIPSM)Ludwig Maximilian University Munich Butenandtstr. 5–13 81377 Munich Germany
2. Center for DNA NanotechnologyDepartment of Chemistry and iNANOAarhus University Gustav Wieds Vej 14 8000 Aarhus C Denmark
3. Department of ChemistryNew York University 100 Washington Square East New York NY 10003-6699 USA
4. Institute of Neural and Sensory Physiology, Medical FacultyUniversity of Düsseldorf Düsseldorf Germany
5. Department of PharmacologyVanderbilt University School of Medicine Nashville TN USA
6. Departments of Pharmacology and ChemistryInstitute of Chemical BiologyVanderbilt University School of Medicine Nashville TN USA