1. Department of Chemistry, University of California, Berkeley, California 94720, United States
2. Faculté de Médecine, Institute of Interdisciplinary Research, Université Libre de Bruxelles, Campus Erasme, Brussels 1070, Belgium
3. Novartis Institutes for BioMedical Research, Cambridge, Massachusetts 02139, United States
4. Department of Molecular and Cell Biology, University of California, Berkeley, California 94720, United States