C-terminally truncated gB enhances fusion. RK13 cells were transfected with plasmids coding for gB-008 (A); gB-008, gD, gH, and gL (B); gB-008, gH, and gL (C); gB-008 and gH (D); gB-008, gD, and gH (E); or gB-008 and gDH (F). Cells were examined microscopically and pictures were taken 36 h posttransfection. Magnification, ×65.