1. Center
for Insoluble Protein Structures (inSPIN), Department of Chemistry
and the Interdisciplinary Nanoscience Center (iNANO), Aarhus University, Gustav
Wieds Vej 14, 8000 Aarhus C, Denmark
2. Roy
and Diana Vagelos Laboratories, Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104-6323, United States