On the surface of red blood cells, which are not the same in all people, a antigenIf the red blood cells of one person to another one with red blood cells with different antigens will cause abnormal reaction (Immunological. Disease). Antigen on red blood cells, there are many people skin, causing a blood group (Blood group) factories into many.Blood group system key and cause medical problems frequently. Especially in the blood transfusion is the ABO.
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