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MPO in lungs of immunocompetent and leukopenic mice infected with S. pneumoniae (means ± SD [error bars] for 5 mice). Levels in uninfected immunocompetent and leukopenic mice were, respectively, 6 ± 4 (straight line) and 4 ± 1 U/lung (dotted line). ∗, P < 0.001 (value was significantly greater than that observed for infected leukopenic mice).
