What is the difference between A and B antigen?

A antigen:

- Produced by the A allele of the ABO blood group gene.

- Composed of N-acetylgalactosamine (GalNAc) attached to a core carbohydrate structure.

- Binds to anti-A antibodies.

B antigen:

- Produced by the B allele of the ABO blood group gene.

-Composed of D-galactose (Gal) attached to a core carbohydrate structure.

- Binds to anti-B antibodies.