1 Department of Biological Chemistry, David Geffen School of Medicine at UCLA Los Angeles CA USA kbackus@mednet.ucla.edu.
2 Department of Chemistry and Biochemistry, UCLA Los Angeles CA USA.
3 State Key Laboratory of Chemical Oncogenomics, Key Laboratory of Chemical Genomics, School of Chemical Biology and Biotechnology, Shenzhen Graduate School, Peking University Shenzhen 518055 China panzy@pkusz.edu.cn.
4 Center for Protein Degradation, Dana-Farber Cancer Institute Boston MA USA.
5 Department of Biological Chemistry and Molecular Pharmacology, Harvard Medical School Boston MA USA lyn_jones@dfci.harvard.edu.