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Blood type AB means you have both A and B antigens. A antigen is a sugar called N-acetyl galactosamine, added to fucose present on a red cell membrane glycoprotein. B antigen â¦ is a sugar called D-galactosamine, also added to fucose.
That means that you have both the A allele (protein) and B allele on the Red Blood Cell surface. You are considered the universal recipient meaning you can accept blood from any blood type. However, your blood can only be used for other AB blood types because it has both types of alleles on its Red Blood Cell surface. The + is the Rh factor, which is separate from the ABO blood type. You will be Rh positive if you have one or both alleles as a +, and are only negative if both the alleles are -.