Term Name:	3-O-[3'-O-sulfo-beta-D-galactosyl-(1->3)-N-acetyl-alpha-D-galactosaminyl]-L-serine(1-) residue
Synonyms:	a 3-O-[3'-O-sulfo-beta-D-galactosyl-(1->3)-N-acetyl-alpha-D-galactosaminyl]-L-serine residue
Definition:	An L-α amino acid residue obtained by deprotonation of the sulfate OH group of 3-O-[3'-O-sulfo-β-D-galactosyl-(1→3)-N-acetyl-α-D-galactosaminyl]-L-serine residue; major species at pH 7.3.
Ontology:	ChEBI [CHEBI:232294]  ( EBI )