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Specific killing of induced Vero-219 cells by 2014-PE38 as measured by the direct cytotoxicity assay. Induced (A) or uninduced (B) cells were treated for 72 h with the indicated concentrations of 2014-PE38 (solid circles) or negative control proteins BL22 (open squares) or 2014-PE38E553 (open triangles). Cell viability was measured by the WST-8 assay. Data points represent mean of duplicate samples; error bars represent standard deviation.
