1. Center
for Insoluble Protein Structures (inSPIN) and Interdisciplinary Nanoscience
Center (iNANO), Department of Chemistry, Aarhus University, Langelandsgade
140, 8000 Aarhus
C, Denmark
2. Howard
Hughes Medical Institute and Department of Pharmacology, University of California at San Diego, La Jolla, California 92093, United States