Seed storage protein. Hexamer; each subunit is composed of an acidic and a basic chain derived from a single precursor and linked by a disulfide bond. Endosperm of the seeds. During seed development. Not expressed at 5-6 months after pollination (MAP), weakly expressed at 6-7 MAP and highly at 7-9 MAP. Weak expression level at 6-7 MAP after which expression gradually increases, with the highest expression at 11-12 MAP (at protein level). Belongs to the 11S seed storage protein (globulins) family.