. "Catalysis of the reaction: D-glucuronyl-1,3-beta-D-galactosylproteoglycan + UDP-N-acetylgalactosamine = N-acetyl-D-galactosaminyl-1,4-beta-D-glucuronyl-1,3-beta-D-galactosylproteoglycan + UDP." . . "glucuronylgalactosylproteoglycan 4-beta-N-acetylgalactosaminyltransferase activity" . "glucuronylgalactosylproteoglycan beta-1,4-N-acetylgalactosaminyltransferase activity" . "N-acetylgalactosaminyltransferase I activity" . "UDP-N-acetyl-D-galactosamine:D-glucuronyl-1,3-beta-D-galactosyl-proteoglycan beta-1,4-N-acetylgalactosaminyltransferase activity" . "uridine diphosphoacetylgalactosamine-chondroitin acetylgalactosaminyltransferase I" . "uridine diphosphoacetylgalactosamine-chondroitinacetylgalactosaminyltransferase I activity" . . .