Fusion function of EBV and Rh-LCV glycoproteins with B cells. (A) CHO-K1 cells were transiently transfected with all of the EBV glycoproteins necessary for fusion (gp42, gB, gH, and gL) or the indicated Rh-LCV glycoprotein. Effector CHO-K1 cells were overlaid with target Daudi B cells and luciferase activity was measured. Luciferase activity was normalized to wild-type EBV levels, which was set to 100%. (B) CHO-K1 cells were transiently transfected with all of the Rh-LCV glycoproteins necessary for fusion (gp42, gB, gH, and gL) or the indicated EBV glycoprotein. Effector CHO-K1 cells were overlaid with target Daudi B cells and luciferase activity was measured. Luciferase activity was normalized to wild-type Rh-LCV levels, which was set to 100%.