MRAM architectures are disclosed that produce an increased write margin and write selectivity without significantly reducing the packing density of the memory. 600 kD; optionally, washing the coagulated leguminous protein fraction thus obtained; and optionally, drying the leguminous protein fraction, and to the use of the leguminous protein fraction as a food, food additive, medicament additive, animal feed, in cosmetics, as industrial protein, andor as an adhesive. a ZBG substituted by a side chain wherein the ZBG is of formula : wherein X is O or S and each R1, R2, R3, and R4 is individually hydrogen or an organic radical.