Before revision: Chapter 9, O-GalNAc Glycans Addition of single monosaccharide residues creates disaccharide antigens : the Thomsen-Friedenreich antigen ( TF antigen or T antigen) is formed by substitution with galactose ( Gal(b1-3)GalNAc) ; the .
After revision: Chapter 9, O-GalNAc Glycans Addition of an additional galactose monosaccharide creates a disaccharide antigen : the Thomsen-Friedenreich antigen ( Gal(b1-3)GalNAc) .