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Comparison of abilities of wild-type L. pneumophila JR32 and the avirulent mutant 25D to prevent PLF (gray bars) and form Mv Mφs (black bars) during an infection of U937 cells. Values represent the means from five experiments in which at least 50 Mφs containing intracellular FL fluorescence were scored per experiment at each of the indicated times after infection. Error bars indicate the standard errors of the means.
