Fas down-modulation does not modify growth or antigen specificity of EBV-CTLs. EBV-CTLs nontransduced (□) and EBV-CTLs transduced with the EV (▪), CsiRNA (▥) or siRNA10 (▦) after selection were cocultured with autologous LCLs with or without the addition of rIL-2 (50 U/mL). After 3 days, cells were pulsed with methyl-³H-thymidine (A). (B) A standard ⁵¹Cr release assay is shown in which CTL killing of autologous LCLs, allogeneic LCLs, and the HBS-2 cell line was tested at an effector-target ratio of 20:1. Data represent the mean ± SD of 3 and 5 different donors, respectively. (C) A representative staining is shown of EBV-CTLs using the tetramers HLA-B8-RAKFQLL and HLA-B8-QAKWRLQTL tetramers targeting BZLF1 and EBNA3A, respectively.