1. Foundation for Applied Molecular Evolution, Westheimer Institute for Science and Technology, P.O. Box 13174, Gainesville, Florida 32604, United States
2. Ra Pharmaceuticals, One Kendall Square, Suite B14301, Cambridge, Massachusetts 02139, United States
3. Department of Chemistry, University of Florida, Gainesville, Florida 32611, United States
4. Department of Cell Biology, Harvard Medical School, 225 Longwood Avenue, Boston, Massachusetts 02115, United States