1. Department of Chemistry and Biochemistry; UCLA-DOE Institute for Genomics and Proteomics; STROBE, NSF Science and Technology Center, University of California, Los Angeles (UCLA), Los Angeles, California 90095, United States
2. Crystallographic Methods, Institute of Molecular Biology of Barcelona (IBMB−CSIC), Barcelona Science Park, Helix Building, Baldiri Reixach 15, 08028 Barcelona, Spain
3. Department of Biological Chemistry and Department of Chemistry and Biochemistry, University of California Los Angeles (UCLA), Howard Hughes Medical Institute (HHMI), UCLA-DOE Institute for Genomics and Proteomics, Los Angeles, California 90095, United States
4. Correlated Imaging, The Rosalind Franklin Institute, Harwell Science & Innovation Campus, Rutherford Avenue, Harwell, Didcot OX11 0GD, United Kingdom
5. ICREA, Institució Catalana de Recerca i Estudis Avançats, Passeig Lluís Companys 23, 08003 Barcelona, Spain