Sulfur-rich seed storage protein that remains undegraded at germination. Two-subunit monomeric unit made of alpha and beta subunits coupled by disulfide bonds (at pH 4.5 and under non-reducing conditions) (By similarity). Can also form oligomers including dimer, tetramer and cyclic hexamer (trimer of dimers) (at pH > 5.5) (By similarity). Component of globulins complexes which accumulate in seeds (Probable). Interacts with flavonoids (e.g. apigenin glucosides) present in globulins complexes (Probable). Accumulates during seed development. Glycosylated on alpha chain. Causes an allergic reaction in human. May be used in antidiabetic therapies and diets for type 2 diabetes (T2D). Capable of reducing glycaemia in mammals. Resistant to pancreatin-mediated digestion. Belongs to the peptidase A1 family.