2.4.1.223	UDP-N-acetyl-alpha-D-glucosamine:[protein]-3-O-(beta-D-GlcA-(1->3)-beta-D-Gal-(1->3)-beta-D-Gal-(1->4)-beta-D-Xyl)-L-serine 4IV-alpha-N-acetyl-D-glucosaminyltransferase (configuration-retaining)