Weak inhibitor of trypsin. Thermostable. Expressed in seeds, not expressed in leaves, roots and pegs. Expressed at very low levels in immature seeds and at high levels from 40-75 days after pollination. Expression decreases after 75 days after pollination. Repressed by water stress. The hydroxyproline modifications determined by mass spectrometry are probably 4-hydroxyproline as determined for other extracellular plant proteins. Isoform 1. Isoform 3. Causes an allergic reaction in human. Binds to IgE. Resistant to proteolysis. Belongs to the 2S seed storage albumins family. Extended N-terminus. Extended N-terminus. Extended N-terminus.