1. Center for Protein Degradation, Dana-Farber Cancer Institute, Boston, Massachusetts 02215, United States
2. Department of Biological Chemistry and Molecular Pharmacology, Harvard Medical School, Boston, Massachusetts 02215, United States
3. Department of Cancer Biology, Dana-Farber Cancer Institute, Boston, Massachusetts 02215, United States
4. Department of Chemical and Systems Biology, ChEM-H, Stanford Cancer Institute, School of Medicine, Stanford University, Stanford, California 94305, United States