Follower of A, B or AB, informally
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Follower of A, B or AB, informally : NEG
The most important grouping of blood types is the ABO system. Blood is classified as either A, B, AB or O, depending on the type of antigens on the surface of the red blood cells. A secondary designation of blood is the Rh factor, in which other antigens are labelled as either positive or negative. When a patient receives a blood transfusion, ideally the donor blood should be the same type as that of the recipient, as incompatible blood cells can be rejected. However, blood type O-neg can be accepted by recipients with all blood types, A, B, AB or O, and positive or negative. Hence someone with O-neg blood type is called a “universal donor”.
Follower of A, B or AB, informally :
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