1. Chemical Biology Laboratory, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Frederick, MD, USA
2. Developmental Therapeutics Branch & Laboratory of Molecular Pharmacology, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Bethesda, MD, USA
3. Basic Science Program, Frederick National Laboratory for Cancer Research, Frederick, MD, USA
4. Center for Structural Biology, Center for Cancer Research, National Cancer Institute, Frederick, MD, USA