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On the blood determines a persons blod type

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The test to determine your blood group is called ABO typing. Your blood is mixed with antibodies against type A and B blood. Then the simple is checked to see whether or not the blood cells stick together.
User April
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It is determined by the presence or absence of certain identifiers on the surface of the red blood cells. There are four main ABO blood type groupings: A, B, AB, and O. These blood groups are determined by the antigen on the blood cell surface and the antibodies present in the blood plasma.

User Gur Dotan
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