Term Name:	O-(N-acetyl-alpha-D-galactosaminyl)-L-serine
Synonyms:	alpha-D-GalNAc-Ser, GalNAc(alpha1->O)Ser, GalNac-alpha-1-O-serine, GalNAcalpha1-Ser, N-acetyl-alpha-D-galactosaminyl-1-O-serine, O-(2-acetamido-2-deoxy-alpha-D-galactopyranosyl)-L-serine, O-(N-acetyl-alpha-D-galactosaminyl)-L-serine, O-[2-(acetylamino)-2-deoxy-alpha-D-galactopyranosyl]-L-serine, Tn Antigen
Definition:	A non-proteinogenic L-amino acid that is N-acetyl-alpha-D-galactosamine linked via an alpha glycosidic bond to the O at position 3 of L-serine.
Ontology:	ChEBI [CHEBI:53608]  ( EBI )