1. Department of Biological Chemistry, David Geffen School of Medicine, University of California, Los Angeles, Los Angeles, California 90095, United States
2. Department of Chemistry and Biochemistry, University of California, Los Angeles, Los Angeles, California 90095, United States
3. Department of Pathology, University of Michigan, Ann Arbor, Michigan 48109, United States
4. Department of Computational Medicine and Bioinformatics, University of Michigan, Ann Arbor, Michigan 48109, United States
5. Molecular Biology Institute, University of California, Los Angeles, Los Angeles, California 90095, United States
6. DOE Institute for Genomics and Proteomics, University of California, Los Angeles, Los Angeles, California 90095, United States
7. Eli and Edythe Broad Center of Regenerative Medicine and Stem Cell Research, University of California, Los Angeles, Los Angeles, California 90095, United States