Western blot analysis of Bcl-2 levels in BL cell lines and EBV-transformed LCLs. Total cell extracts from equal numbers of cells (∼50,000) were loaded in each lane. The figure shows immunoblot results obtained using a monoclonal antibody to human Bcl-2 (see the Materials and Methods). Also indicated are the p53 mutation (m indicates presence of 1 or 2 mutated alleles) and EBV infection status (+ indicates infected) for each cell line.