Stimulated number of Id-induced IFN-γ cytokine–secreting cells/10⁵ cells (ELISPOT) in CD4⁺ and CD8⁺ T-cell subpopulations from patients no. 1 (A) and no. 3 (B), enriched from PBMC by magnetic microbeads. CD4⁺ and CD8⁺ cells, respectively, were cultured with 5% autologous adherent cells in the presence of F(ab′)₂ fragments of the autologous (▨) or isotype-matched allogeneic (▧) monoclonal IgG (10 pg/mL). Standard error of means are shown on top of each column.