Figure 6.

Percentage of CD8⁺ cells in each cytotoxic T lymphocytes (CTL) cell line producing intracellular cytokines [interferon-γ (IFNγ), interleukin-2 (IL-2) and tumour necrosis factor-α (TNF-α)] upon restimulation with autologous lymphoblastoid cell line. I+, cells producing IFN-γ alone; L+, cells producing IL-2 alone and T+, cells producing TNF-α alone. I+L+T+, cells producing all three cytokines; I+L+, cells producing IFN-γ and IL-2; I+T+, cells producing IFN-γ and TNF-α; L+T+, cells producing IL-2 and TNF-α.