“… 14 As it is well known that disturbing the 3-dimensional structure of allergens, including lipocalins, results in diminished IgE binding, 29 , 30 , 31 it seems plausible that Western blotting, because of denaturation, underestimates the frequency of IgE reactivity to nCan f 4. As Hattori et al 32 reported the complete refolding of β-lactoglobulin, a lipocalin, was found to require disulfide bond formation under strict conditions. Our findings are compatible with this view, as our analysis showed that immunoaffinity-purified nCan f 4 contains a functional disulfide bridge ( Fig.…”