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Lewis antigen system

Lewis antigen system is a human blood group system based upon genes on chromosome 19. There are two types of Lewis antigens, Lewis a and Lewis b. They are the only red cell antigens which are not produced by the erythrocyte itself. Instead, it is a component of body secretions, and is subsequently adsorbed onto the surface of the erythrocyte.

This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Lewis_antigen_system". A list of authors is available in Wikipedia.
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