Blood group H tetrasaccharide type 1

Blood group H tetraose type I

The Blood group H tetrasaccharide type 1 is a specific carbohydrate epitope found on the surface of red blood cells. Its structure is a tetrasaccharide with a terminal fucose unit that serves as the basis for the H antigen. This compound is the universal precursor from which the A and B antigens are synthesized, and it is the defining marker for the Type O blood group.