Rhamnose-binding lectin. Also binds melibiose, raffinose, D-galactose, L-arabinose, D-fucose, maltose and D-glucose with decreasing affinity. Does not bind D-arabinose, L-fucose, lactose, xylose or 2-deoxy-D-galactose. Shows strong hemagglutinating activity against rabbit erythrocytes. Homodimer; non-covalently linked.