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Expression of interleukin (IL)-4 and interferon (IFN)-γ in BAL CD4+ cells from a patient with cavitary pulmonary tuberculosis. Flow cytometric assessment of cell-specific cytokine response in BAL cells was performed by use of immunofluorescent antibodies against CD4, IFN-γ and IL-4. Depicted is the percentage of CD4+ cells expressing IFN-γ and/or IL-4.
