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Induction of 4-1BB expression on the surface of CD4+ T cells from blood and BAL of CBD patients after BeSO4 exposure. A, A representative example is shown of the time course of 4-1BB induction on the surface of BAL CD4+ T cells ex vivo and after BeSO4 exposure for 24, 48, 72, and 96 h. B, 4-1BB expression of BAL cells (n = 5) and PBMCs (n = 6) ex vivo and after 100 μM BeSO4 exposure for up to 96 h is shown.
