Seed storage protein. Homotrimer. Expressed in seed (at protein level) (PubMed:27128197). Expressed in seed (PubMed:25084379). Expressed during nut development. Expressed in gel stage of the seed kernel. Causes an allergic reaction in human. Binds to IgE of patients allergic to pecan nuts and walnuts. Binds to IgE in 30% of the 27 patients tested by Western blot and in 24% of the 25 patients tested by double-blind, placebo-controlled oral food challenge. Belongs to the 7S seed storage protein family.