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Cytokine production in the lungs during Mycobacterium tuberculosis infection. Cytokine levels were measured by intracellular staining and flow cytometry of lung cell suspensions. Data are the absolute no. of cytokine-producing cells per lung and represent the mean ± standard deviation of values from each mouse (n = 5) per group and per time point. IFN, interferon; IL, interleukin; TNF, tumor necrosis factor. **P < .01.
