1. Department of Molecular and Cell Biology, University of California, Berkeley, Berkeley, United States
2. Institut de Pharmacologie Moléculaire et Cellulaire, Université de Nice Sophia Antipolis, Nice, France
3. Department of Chemistry, University of California, Berkeley, Berkeley, United States
4. Department of Chemistry, Center of Integrated Protein Science, University of Munich, Munich, Germany
5. Helen Wills Neuroscience Institute, University of California, Berkeley, Berkeley, United States
6. Physical Bioscience Division, Lawrence Berkeley National Laboratory, Berkeley, United States