GSH-promoted survival of activated T cells. (A) IL-2–deprived T cells were incubated in the presence () and absence (▪) of FCS (5%), alone (C) or in the presence of GSH (3 mmol/L). Percent survival was determined following incubation for 4 days. (B) Activated T cells deprived of IL-2 were incubated with increasing concentrations of either GSH (•) or GSSG (○), and survival determined after 3 days. For both experiments, the values represent means ± SEM of triplicate cultures, and results are representative of two independent experiments.