Type 2 precursor chain and associated antigen structures, found on endothelial, epithelial, and red blood cells throughout the body. The H antigen is the acceptor molecule needed for attachment of the A, B, or AB terminal glycosides.
Fuc – Fucose; FUT1 - α1,2-Fucosyltransferase enzymes expressed by HH genes; FUT3 - α1,3/4-Fucosyltransferase enzymes expressed by Le genes; Gal – Galactose; GalNAc - N-acetylgalactosamine; GlcNAc - N-acetylglucosamine; NeuAc - N-acetylneuraminic (sialic) acid