Seed storage protein. Homohexamer (By similarity). Each subunit is composed of an acidic and a basic chain derived from a single precursor and linked by a disulfide bond (PubMed:21718052). Expressed in seeds (at protein level) (PubMed:21718052). Expressed in seeds (PubMed:28121438). Expressed during seed maturation (PubMed:21718052). Expressed during embryonic development including the water, gel, dough and mature nut stages in the nut cavity tissues including the contents of the central vacuole, endosperm, embryo, placenta, seed coat, ovary packing tissue, developing fruit and cotyledon lobes. Expression increases during the transition from water to gel stage, levels off or decreases slightly from the gel to dough stage and increases again from the dough to mature stage (PubMed:28121438). Up-regulated during nut development. Causes an allergic reaction in human. Recombinant protein binds to IgE in 57% of the 28 patients tested allergic to pecan nuts. Acidic chain is more immunoreactive than the basic chain. Belongs to the 11S seed storage protein (globulins) family.