1. Department of Biological Chemistry Department David Geffen School of Medicine, UCLA Los Angeles CA 90095 USA
2. Department of Chemistry and Biochemistry, UCLA Los Angeles CA 90095 USA
3. Molecular Biology Institute, UCLA Los Angeles CA 90095 USA
4. Department of Human Genetics David Geffen School of Medicine, UCLA Los Angeles CA 90095 USA
5. DOE Institute for Genomics and Proteomics, UCLA Los Angeles CA 90095 USA
6. Jonsson Comprehensive Cancer Center, UCLA Los Angeles CA 90095 USA