This site is by an author that published a book with unverified theories about links between blood groups and optimal diet ( http://en.wikipedia.org/wiki/Blood_type_diet ). It still appears to be a reasonable resource for some of the basic science about blood group antigens, but be on the lookout for pseudoscience.
α-N-Acetyl-galactosaminidase α1-2 Fucosidase α1-2,3 Mannosidase α1-6 Mannosidase α2-3 Neuraminidase β1-3 Galactosidase α1-3, 6 Galactosidase β-N-Acetylglucosaminidase β-N-Acetylhexosaminidasef β1-4 Galactosidase Neuraminidase Protein Deglycosylation Mix