KEGG:R04603

UDP-N-acetyl-D-galactosamine + D-Glucuronyl-N-acetyl-1,3-beta-D-galactosaminylproteoglycan <=> UDP + N-Acetyl-beta-D-galactosaminyl-1,4-beta-D-glucuronyl-N-acetyl-1,3-beta-D-galactosaminylproteoglycan