FIG. 6.

Influence of oligosaccharides on the cytotoxicity of ShlA to HEp-2 cells. Sorbitol (M_r, 182), sucrose (342), maltotriose (504), maltopentaose (828), dextrin 20 (900), maltoheptaose (1,152), dextran 15 (1,400), or dextran 4 (4,000) was added to a final concentration of 30 mM in complete culture medium. Cells were coincubated with 3 HU of ShlA/ml for 1 h at 37°C under a 5% CO₂ atmosphere. Values shown are the means and standard deviations from experiments carried out three times in triplicate.