Medicago AB Products Are Available Worldwide. For Research Use Only. Trichosanthes Japonica Agglutinin (TJA-I) is along with its isolectin Trichosanthes Japonica Agglutinin 2 (TJA-II) isolated from the root tubers of Japanese gourd. They are highly purified and one purification step involves bio specific affinity chromatography to ensure highest possible binding affinity. They both have affinity for lactose but while TJA-II favors fucose 1->2 lactose TJA-I favors acidic groups coupled to N-Acetyl-D-lactosamine in 1,4 position. 2 mg. Two variants, affinity for lactose, ultrapure quality. See more product details here.