the cytoplasm of the mucous cell contained neutral glycoproteins with different saccharide residues as alpha-d-mannose , n-acetyl-beta ( 1 -- -- 4 ) -d-glucosamine , galactose , alpha-galactose , alpha-n-acetylglucosamine , beta-d-gal ( 1 -- -- 3 ) -d-galnac , alpha-l-fucose and sialic acid .
C0017718
glucosamine
C0001056
acetylglucosamine