Red blood cells have specific proteins known as _______ on their surfaces.

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Red blood cells have specific proteins on their surface known as antigens, which help distinguish one person's blood type from another. These antigens are the basis for the ABO blood typing system. Fibrinogens and prothrombins are clotting factors, while antibodies are proteins produced by the immune system to defend against foreign substances in the body.

Red Blood Cells Have Specific Proteins Known as _______ on Their