Proliferation and Bcl-2 expression of activated T cells incubated with exogenous GSH. (A) The proliferation of IL-2–deprived activated T cells incubated alone (C), with IL-2 (5 ng/mL) or with GSH (3 mmol/L) was determined after 3 days. Values are expressed as mean ³H-thymidine incorporation (± SEM) of quadruplicate cultures from a representative experiment. (B) Activated T cells incubated for 3 days either alone (control), with IL-2 (5 ng/mL), or with GSH (3 mmol/L) were stained for Bcl-2 expression. The results are representative of three independent experiments.