FIG 3.

gH/gL-independent epithelial-cell fusion. CHO-K1 target cells were transfected with the indicated expression constructs, including a T7-driven luciferase reporter construct. (A) The cells were overlaid with indicator epithelial cells expressing T7 polymerase, and cell-cell fusion was monitored by luciferase expression. (B) The expression of gB on the cell surface was monitored by CELISA using monoclonal antibody CL55, directed at gB. (C) The expression of gH/gL on the cell surface was monitored by CELISA using monoclonal antibody E1D1, directed against gH/gL.