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Comparison of ET- and BT-Stx2dact cytotoxicity for HCT-8 cells with or without pre-treatment by butyrate. (A) Toxicity assays for untreated HCT-8 or (B) cells pre-treated with butyrate. Mean and standard deviation are shown from duplicate samples. The higher the A630, the more fixed and crystal violet-stained cells remain after toxin exposure.
