Sunita Shirtode
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Posted 6 year ago
Which are the main types of blood?
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Nisha Nikam
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Posted 6 year ago Nisha Nikam

Human blood is grouped into four types: A, B, AB, and O. Each letter refers to a kind of antigen, or protein, on the surface of red blood cells. For example, the surface of red blood cells in Type A blood has antigens known as A-antigens.