N-acetyl-D-glucosamine-specific lectin. Specifically agglutinates rabbit erythrocytes. Optimum pH is 6.0-8.0. No activity below pH 3.0 or above pH 11.0. Thermostable. Activity unaffected after incubation for 30 minutes at 30-70 degrees Celsius. Retains 50% of its maximal activity after incubation at 80 degrees Celsius for 30 minutes. Monomer. Divalent cations are required for ligand binding. Calcium is the most effective, but manganese or zinc can also be used to a lesser extent.