Fig. 1.

Inhibition of EBV antigen expression in superinfected Raji cells by compound (XV). Raji cells were superinfected with 10 units of EA-inducing virus in the absence and presence of various concentrations of compound (XV). Cells were fixed with cold methanol 24 h after infection and processed for EA/VCA staining using NPC patients’ serum. After immunofluorescent staining (panels A–E), the same slides were counterstained with DAPI (panels a–e). Panel A, superinfected cells without drug; panel B, superinfected cells with 20 μM of compound (XV); panel C, superinfected cells with 50 μM of compound (XV); panel D, superinfected cells with 70 μM of compound (XV); panel E, superinfected cells with 90 μM of compound (XV).