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 (By similarity). Interacts with flavonoids (e.g. apigenin glucosides) present in globulins complexes (By similarity). Present in the extracellular spaces of germinating cotyledons and in the young roots. Expressed in developing seeds and in the young roots and cotyledons of germinating seeds and young seedlings. Accumulates during seed development. Secreted in high amounts upon heat treatment of mature seeds. 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.