in order to maintain the high degree of immunologic specificity of the native antigen , this determinant must be at least a trisaccharide unit , because the native polysaccharide as isolated has terminal disaccharide units [ alpha-d-neuacp- ( 2 -- > 3 ) -beta-d-galp ] identical to those found in the human m and n blood group substances and fetuin .
C0086418
human
C0002210
fetuin