EXT1 and autoimmune disease: MN podocyte antigens exostosin 1/eoxstosin 2 (EXT1/EXT2), neural cell adhesion molecule 1 (NCAM1), and transforming growth factor-β receptor 3 (TGFBR3) are associated with other autoimmune diseases, especially systematic lupus erythematosus (SLE) (46–48).