1. Center for Insoluble Protein Structures (inSPIN), Interdisciplinary Nanoscience Center (iNANO) and Department of Chemistry, University of Aarhus, Langelandsgade 140, DK-8000 Aarhus C, Denmark, and Department of Biochemistry and Beckman Institute, University of Illinois at Urbana–Champaign, 405 North Mathews, Urbana, Illinois 61801