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Levels of nitric oxide (NO) in BAL fluids of immunocompetent and leukopenic mice infected with S. pneumoniae (means + SD [error bars] for five mice). Values for uninfected immunocompetent versus leukopenic animals were, respectively, 10 ± 2 and 9 ± 2 μm/ml. ∗, value was significantly greater than that for infected leukopenic mice (P < 0.05).
