What on the blood determine a person’s blood type.

Blood types are determined by the presence or absence of certain antigens – substances that can trigger an immune response if they are foreign to the body. Since some antigens can trigger a patient's immune system to attack the transfused blood, safe blood transfusions depend on careful blood typing and cross-matching.

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the second type of galaxy is called a barred spiral, which has a thing called a bar straddling the nucleus

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