1. Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States
2. Department of Physiology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States
3. Department of Biochemistry and Molecular Biology, University of British Columbia, Vancouver, BC, Canada V6T 1Z3
4. Department of Microbiology and Physiological Systems, University of Massachusetts Medical School, Worcester, Massachusetts 01655, United States
5. PTC Therapeutics, 100 Corporate Court, South Plainfield, New Jersey 07080, United States