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Correlations between IL-2+, IFN-γ+, and tumour necrosis factor-alpha (TNF-α)+ bronchoalveolar lavage (BAL) lymphocytes (CD3+) in patients with sarcoidosis (•) and healthy volunteers (○). (a) Correlation between IFN-γ+ and IL-2+ cells. (b) Correlation between TNF-α+ and IL-2+ cells. (c) Correlation between TNF-α+ and IFN-γ+ cells.
