1. Laboratory of Pathology, Center for Cancer Research, National Cancer Institute, Bethesda, Maryland 20892, United States
2. Center for Cancer Research Protein Expression Laboratory, National Cancer Institute, Frederick, Maryland 21702, United States
3. Genetic Engineering and Viral Vector Core, Office of the Scientific Director, National Institute on Drug Abuse, Baltimore, Maryland 21224, United States
4. Laboratory of Cell Biology, Center for Cancer Research, National Cancer Institute, Bethesda, Maryland 20892, United States