D-mannose/D-glucose-binding lectin. Induces histamine release in mast cells from hamster and rat. Induces lymphocyte proliferation and IFNG production. Equilibrium between homodimer and homotetramer. Oligomerization is pH-dependent with homotetramers forming at pH 6.5 and above. Cotyledonary membrane-bound vacuolar protein bodies. Seed. The beta and gamma chains are produced by partial proteolytic processing of the lectin alpha chain by an asparaginyl endopeptidase. Mixture of 60% alpha lectin and 40% of its beta and gamma proteolytic fragments. Gamma chain isolectin. Gamma chain isolectin. Gamma chain isolectin. Binds one manganese (or another transition metal) ion and one calcium ion. The metal ions are essential for the saccharide-binding and cell-agglutinating activities. Belongs to the leguminous lectin family.