IgE cross-reactivity between Ara h 2 and Ara h 6 investigated with a solid-phase assay. A, schematic principle of the solid-phase assay (Ara h 2, red triangle; Ara h 6, blue triangle, see Methods); B, relative decrease of IgE binding to one 2S-albumin after depletion of IgE antibodies recognizing the other 2S-albumin (n=32, mean is indicated).