Table 1.

Linear structure of precursor oligosaccharide chains of the ABO, H, Lewis and secretor histo-blood group systems.

Types	Terminal structures	Expressed forms
1	Galβ1→3GlcNAcβ1-R	Glycoproteins, glycolipids
2	Galβ1→4GlcNAcβ1-R	Glycoproteins, glycolipids
3	Galβ1→3GalNAcα1-R	Glycolipids
4	Galβ1→3GalNAcβ1-R	Glycolipids
5	Galβ1→3Galβ1-R	Synthetic structure
6	Galβ1→4Glcβ1-R	Glycoproteins, glycolipids

Source: Adapted from Oriol.¹⁶