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The mixing of blood between different individuals, particularly in the context of transfusions, is prevented primarily by the presence of blood group antigens and antibodies. Each blood type (A, B, AB, O) has specific antigens on the surface of red blood cells and corresponding antibodies in the plasma. When incompatible blood types are mixed, the antibodies can attack the foreign antigens, leading to agglutination and potentially severe immune reactions. Additionally, the body's immune system plays a crucial role in recognizing and responding to foreign blood cells.

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1mo ago

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