1. The Hormel Institute, University of Minnesota, Austin, Minnesota 55912, United States
2. Structural Biology Program, Memorial Sloan-Kettering Cancer Center, New York, New York 10065, United States
3. Structural Biology, CIC bioGUNE, Derio, Spain
4. Mayo Clinic College of Medicine, Rochester, Minnesota 55905, United States
5. Shemyakin and Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences, Moscow, Russia