Figure 1.

Specific IgE binding to extracts of wild-type and GM potatoes, as determined by ELISA, vs. the A/H ratio of the potato. A/H: the ratio of the size of the wheal induced by allergen on allergic skin-prick test to that induced by histamine. N: number of subjects in each response group according to the skin-prick test using potato extract. Positive cutoff values were determined from the mean plus two standard deviations (M + 2SD) of the absorbance values of the 38 healthy controls.