obsolete [protein]-3-O-(N-acetyl-D-glucosaminyl)-L-serine O-N-acetyl-alpha-D-glucosaminase activity https://github.com/geneontology/go-ontology/issues/27560 true GO:0102167 molecular_function This term was obsoleted because it represents a specific substrate of [protein]-3-O-(N-acetyl-D-glucosaminyl)-L-serine/L-threonine O-N-acetyl-alpha-D-glucosaminase activity ; GO:0102571. OBSOLETE. Catalysis of the reaction: H2O + an N-acetyl-alpha-D-glucosaminyl-L-serine-[glycoprotein] = N-acetyl-alpha-D-glucosaminide + a [protein]-L-serine. [protein]-3-O-(N-acetyl-D-glucosaminyl)-L-serine/L-threonine O-N-acetyl-alpha-D-glucosaminase activity