Alpha-methyl-D-mannoside-specific lectin. Has hemagglutinating activity towards rabbit erythrocytes. Binds to cytokinins and significantly inhibits physiological effects of cytokinin activity such as cotyledon expansion and delayed leaf senescence. Homodimer. Glycosylated. The hemagglutination activity of native and recombinant SL-I was not inhibited by cellobiose even at 120 mM, however alpha-methylmannoside and 2-alpha-mannose inhibited hemagglutination at 0.38 mM and 0.39 mM respectively. Belongs to the leguminous lectin family.