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4-1BB ligand expression is elevated on CD14+ cells in the lung of BeS and CBD patients. 4-1BBL expression was evaluated on CD14+ cells from the peripheral blood of normal (n = 11), BeS (n = 8), and CBD (n = 16) patients and the BAL of BeS (n = 5) and CBD (n = 16) subjects. Median values are shown with solid lines. Statistical significance was established using the Kruskal-Wallis test.
