Description_x000D_ General description_x000D_ Uridine diphosphate (UDP)-GalNAc acts as a precursor in the biosynthesis of O-linked oligosaccharide. It also acts as a substrate for synthesis of chitin, a vital element of cell walls in fungi and of exoskeletons of arthropods and insects._x000D_ Application_x000D_ Uridine 5′-diphospho-N-acetylgalactosamine disodium salt has been used as a substrate for polypeptide N-acetylgalactosaminyltransferase (ppGalNAc-T)._x000D_ Packaging_x000D_ 100 mg in poly bottle_x000D_ 5, 25 mg in glass bottle