Alloantibodies are antibodies directed against antigens from what source?

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Multiple Choice

Alloantibodies are antibodies directed against antigens from what source?

Explanation:
Alloantibodies are antibodies formed against antigens from another person of the same species. This means they arise when the immune system encounters foreign but species-matched antigens—such as those encountered after a transfusion, during pregnancy, or after a transplant—on cells from another individual. They are not directed at the person’s own antigens (those would be autoantibodies), nor are they aimed at environmental substances or pathogens. So the source of the antigens these antibodies target is another person, within the same species.

Alloantibodies are antibodies formed against antigens from another person of the same species. This means they arise when the immune system encounters foreign but species-matched antigens—such as those encountered after a transfusion, during pregnancy, or after a transplant—on cells from another individual. They are not directed at the person’s own antigens (those would be autoantibodies), nor are they aimed at environmental substances or pathogens. So the source of the antigens these antibodies target is another person, within the same species.

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