Western blot immunoassay of JLP 119 cells transfected with bcl-2. JLP 119 cells with a stable transfection of either vector alone (G4 and G21) or plasmid expressing the human bcl-2 gene (H6 and H10) were tested for expression of the Bcl-2 protein as described in the legend to Fig 2. The level of expression of endogenous Bcl-2 in EW-36 cells is shown for comparison.