. "The sulfation is at the 4-position of N-acetylgalactosamine residues of chondroitin." . "Not identical with EC 2.8.2.17." . . . "Chondroitin 4-sulfotransferase" . "3'-phosphoadenylyl sulfate + chondroitin = adenosine 3',5'-bisphosphate + chondroitin 4'-sulfate." .