1. Department of Biological Chemistry, School of Medicine
2. Molecular and Cellular Biology Laboratory, Institutes of Biomedical Sciences
3. Department of Pharmacology and Moores Cancer Center, University of California San Diego, La Jolla, California 92093
4. Department of Biochemistry and Biophysics, Lineberger Comprehensive Cancer Center, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599
5. Department of Biology, School of Life Science Fudan University, Shanghai 200032, China