blood type
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Blood type is a classification system that categorizes people's blood based on specific antibodies and antigens (proteins and markers) found on the surface of their red blood cells. This matters because blood types determine compatibility for blood transfusions and can be important for medical treatment and pregnancy.
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Blood type (or blood group) is determined, in part, by the ABO blood group antigens present on red blood cells.
A blood type (also known as a blood group) is a classification of blood based on the presence and absence of antibodies and inherited antigenic substances on the surface of red blood cells (RBCs). These antigens may be proteins, carbohydrates, glycoproteins, or glycolipids, depending on the blood group system. Some of these antigens are also present on the surface of other types of cells of various tissues. Several of these red blood cell surface antigens can stem from one allele (or an alternative version of a gene) and collectively form a blood group system.