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Inhibition of the cytotoxicity of Stx2a and Stx2d for Vero cells by the tetravalent peptides identified in this study. The effects of the tetravalent peptides indicated on the cytotoxicity of Stx2a (10 pg/ml; A and C) or Stx2d (80 pg/ml; B and D) for Vero cells were examined with a cytotoxicity assay. Data are presented as percentages of the control value (mean ± standard error, n = 3; *, P < 0.05; **, P < 0.01 [Tukey's test, compared with MMA-tet]).
