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. Accumulates in seeds 8 days after anthesis. Detected in siliques at nucleotide level from 6 days post anthesis (dpa) to 17 dpa. First observed in siliques at protein level 12 dpa and accumulates progressively as native isoforms or proteolytic fragments during the last week of seed maturation/desiccation. Present in dry seeds, but disappears during their germination (at protein level). By abscisic acid (ABA) in an ABI3- and FUS3-dependent manner. Proteolytically processed during seed maturation at a conserved Asn-Gly peptide bond by an asparaginyl endopeptidase to produce two mature polypeptides referred to as alpha and beta subunits that are joined together by a disulfide bond. Phosphorylated in seeds on some Tyr residues in response to abscisic acid (ABA). Belongs to the 11S seed storage protein (globulins) family. Truncated N-terminus. Truncated N-terminus.