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GAL (Galactose Alpha-1,3-Galactosyltransferase): GAL is an enzyme responsible for producing the alpha-gal epitope, a specific carbohydrate antigen. This enzyme plays a key role in immune response and xenotransplantation, as the presence of alpha-gal can trigger immune rejection. Humans lack this enzyme, which leads to the formation of anti-Gal antibodies.

