O-(N-acetyl-alpha-D-glucosaminyl)-L-serine residue
o-(n-acetyl-alpha-d-glucosaminyl)-l-serine residue
The <small>L</small>-α-amino acid residue formed from <em>O</em>-(<em>N</em>-acetyl-α-<small>D</small>-glucosaminyl)-<small>L</small>-serine.