CTL phenotype is unchanged after transduction.

To determine CTL phenotypes, the nontransduced (black) and TGF-βRII-Δcyt–transduced (gray) EBV-specific CTL cultures were stained with antibodies against T-cell surface antigens CD3, CD4, CD8, CD56, T-cell receptor αβ, and T-cell receptor γδ, and surface immunofluorescence was analyzed by flow cytometry.