Monoclonal antibody, D2-40 reacts with a O-linked sialoglycoprotein (MW 40K) found on lymphatic endothelium, fetal testis and on the surface of testicular germ cell tumors. In recent studies (see datasheet) clone D2-40 have shown staining in lymphatic channel endothelium but not in the adjacent capillary. In the same study, Clone D2-40 has shown staining in endothelium of lymphangiomas whereas hemangiomas, glomus tumors, angiolipomas, pyogenic granulomas, vascular malformations did not show any staining.