Cytolytic assays with CMV-antigen–pulsed autologous DC targets preincubated with HLA class 1 blocking antibody.

HLA restriction of the cytotoxic activity of the culture-output cells demonstrated by prevention of lysis of autologous CMV-antigen–pulsed targets preincubated with anti-HLA class 1 antibody (■) compared with preincubation with a control anti-CD19 antibody (▪). ░ indicates autologous unpulsed controls.