Term Name:	protein O-linked glycosylation via N-acetylgalactosamine
Synonyms:	core O-glycan biosynthetic process, mucin-type O-glycan synthesis, O-glycan processing, protein O-linked GalNAcylation, protein O-linked glycosylation via N-acetyl-galactosamine
Definition:	A glycoprotein biosynthetic process starting with the covalent linkage of an N-acetyl-galactosamine via an alpha-glycosidic bond to the oxygen atom of a serine or threonine side chain in a protein, which can be further elongated with the sequential addition of sugar units resulting in the formation of a protein O-linked glycan.
Ontology:	GO: Biological Process [GO:0016266]    QuickGO    AmiGO