1. Department of Biological Chemistry, David Geffen School of Medicine, UCLA, Los Angeles, California 90095, United States
2. Department of Chemistry and Biochemistry, UCLA, Los Angeles, California 90095, United States
3. Department of Pathology and Laboratory Medicine, David Geffen School of Medicine, UCLA, Los Angeles, Los Angeles, California 90095, United States
4. DOE Institute for Genomics and Proteomics, UCLA, Los Angeles, California 90095, United States
5. Jonsson Comprehensive Cancer Center, UCLA, Los Angeles, California 90095, United States
6. Eli and Edythe Broad Center of Regenerative Medicine and Stem Cell Research, UCLA, Los Angeles, California 90095, United States