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H antigen (tons in O, gets converted to A or B). Made from type 1 (secretions) and type 2 (blood) precursor carb chains. In blood, type 2 chains are converted to H antigen by fucosylation of the H gene product. If no further modifications are made, this person is O. If you have N-acetylgalactosaminyltransferase, then you convert to A and if you have galactosyltransferase, you are B.
333 Amazing Uses For Coconut Oil