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Effect of Stx1 or Stx2 holotoxins or their cloned B subunits on Daudi (A) and Ramos (B) Burkitt's lymphoma B cells. B cells were incubated at 37°C for 18 h with the indicated concentrations of Stx1 or Stx2 holotoxins or their cloned B subunits. The B cells were then labeled with Annexin V-FITC and propidium iodide, and the proportion of early and late apoptotic cells in each sample was determined by flow cytometry analysis. The error bars (n = 5) represent the standard deviations.
