1. Department of Biology, Massachusetts Institute of Technology, 30 Ames St, Cambridge, Massachusetts 02142, United States
2. Whitehead Institute for Biomedical Research, 455 Main St, Cambridge, Massachusetts 02142, United States
3. Faculty of Biology, University of Freiburg, Schänzlestraße 1, Freiburg 79104, Germany
4. Structural Genomics Consortium, UNC Eshelman School of Pharmacy, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, United States
5. Division of Chemical Biology and Medicinal Chemistry, UNC Eshelman School of Pharmacy, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, United States