"Fascinating...Controversial...Another great contribution. With The GenoType Diet Peter D'Adamo is taking it one level past where most of us stop. He has a virtually encyclopedic knowledge of this topic."
Substances that are capable of causing an immune response. The ABO antigens are chains of carbohydrate molecules; the type A antigen is N-acetyl galactosamine; the B antigen is galactose and the O or H antigen is fucose.