Lectin specific for high mannose N-glycans, recognizes the branched moiety of these glycans. Does not recognize other types of N-glycans or monosaccharides. Agglutinates trypsin-treated sheep and rabbit erythrocytes and untreated sheep erythrocytes. Has mitogenic activity on mouse lymphocytes. Does not require metal ions for activity. Stable over a wide pH range, activity is unaffected after incubation at pH 2.5-10.5. Activity is unaffected by heating at 60 degrees Celsius for 1 hour. Activity gradually decreases after incubation at higher temperatures. Monomer. Belongs to the bacterial lectin family.