Clonality of EBV.

Southern blot analysis for clonality of EBV as evidence for monoclonal expansions of EBV-positive cells in primary tumor in patient 1 (lane 1), SNK-6 cells (lane 2), primary tumor in patient 2 (lane 3), and SNT-8 cells (lane 4). Controls are B95-8 cells (B) and Raji cells (R) for cells with monoclonal EBV expansion and polyclonal EBV replication, respectively.