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Toxin and cell type dictate CDC resistance. (a-f) The indicated human and murine cells were challenged with CDCs at the indicated concentrations in 2 mM CaCl2 supplemented RPMI (RC) with 20 μg/ml propidium iodide (PI) for 5 min at 37 °C. PI uptake was analyzed by flow cytometry and specific lysis was determined. The graphs display the average±S.E.M. of at least three independent experiments
