1. Cell and Cancer Biology Branch, National Cancer Institute, Bethesda, Maryland 20892
2. Screening Technologies Branch, Developmental Therapeutics Program, Division of Cancer Treatment and Diagnosis, National Cancer Institute at Frederick, Frederick, Maryland 21702
3. SAIC-Frederick, National Cancer Institute at Frederick, Frederick, Maryland 21702
4. Biological Testing Branch, Developmental Therapeutics Program, Division of Cancer Treatment and Diagnosis, National Cancer Institute at Frederick, Frederick, Maryland 21702