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A person's blood type is determined by the presence or absence of specific antigens on the surface of red blood cells, primarily the A and B antigens, which categorize blood into types A, B, AB, or O. The immune system produces antibodies against the antigens it does not recognize as self; for instance, a person with type A blood will have anti-B antibodies. This antibody formation is stimulated by exposure to foreign antigens, whether through transfusions, pregnancy, or infections. Therefore, the combination of inherited genes and immune responses shapes an individual's blood type and antibody profile.

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2w ago

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