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. Molecular Biology Institute, UCLA, 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