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AB+   universal receiver
O-      universal donor
If a person does not receive the right type of blood transfusion, it will be useless because our bodies will destroy them. 

A (A antigens on red blood cells; B antibodies in plasma)
B (B antigens; A antibodies)

AB (A and B antigens; no antibodies)
O (no antigens; A and B antibodies)

+ (antigen "Rh factor" on red blood cells)
- (no antigen)
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