Affiliation: | 1. Laboratory of Molecular Virology and Carcinogenesis, LBI-Basic Research Program, National Cancer Institute-Frederick Cancer Research Facility, Frederick, Maryland 21701, USA;2. Department of Molecular Biology, University of Brussels, B-1640 Rhode St.-Genese, Belgium;3. Program Resources, Inc., National Cancer Institute-Frederick Cancer Research Facility, Frederick, Maryland 21701, USA |