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Cell viability following LeTx exposure. MTT assay results (average absorbance values) following incubation of J774 cells with human PA in the presence or absence of a representative human serum sample. C, cells alone; C+S, cells incubated with serum; C+T, cells incubated with toxin; C+S+T, cells incubated with serum and toxin. Bars represent 1 standard deviation. *, P value of <0.05 for comparison between C+T and C+S+T values.
