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Production of IFN-γ and IL-2 by T cells deprived of tryptophan. T cells were activated with anti-CD3 mAb in tryptophan-free medium (▪) or in the same medium supplemented with 25 μM tryptophan (•) and the concentration of IFN-γ (A) and IL-2 (B) in culture supernatants determined at the times shown.
