1. Center for Insoluble Protein Structure (inSPIN), Department of Molecular Biology, University of Aarhus, DK-8000 Aarhus C, Denmark, Department of Medical Biochemistry, University of Aarhus, DK-8000 Aarhus C, Denmark, and Department of Microbiology, NYU School of Medicine, 550 First Avenue, New York, New York 10016