GO:0016267

O-glycan processing, core 1

Details: 
The stepwise addition of carbohydrate or carbohydrate derivative residues to the initially added O-linked residue (usually GalNAc) to form the core 1 O-glycan structure, Gal-beta-(1->3)-GalNAc. [GOC:mah, GOC:pr, PMID:10580130]
Evidence Code: 
ISO