1. Departments of Structural Biology, St. Jude Children’s Research Hospital, 262 Danny Thomas Place, Memphis, Tennessee 38105, United States
2. Developmental Neurobiology, St. Jude Children’s Research Hospital, 262 Danny Thomas Place, Memphis, Tennessee 38105, United States
3. Integrated Biomedical Sciences Program, University of Tennessee Health Science Center, Memphis, Tennessee 38163, United States
4. Center for Proteomics and Metabolomics, St. Jude Children’s Research Hospital, 262 Danny Thomas Place, Memphis, Tennessee 38105, United States
5. Department of Genetics, Department of Chemistry, Department of Biology, Stanford University, Stanford, California 94305, United States