The Indian blood group system (In) is named because 4% of the population in India possess it . It is a classification of blood based on the presence or absence of inheritedantigens that reside within the CD44 molecule that is expressed on the surface of blood cells. Most individuals express the Inb antigen that results from an arginine residue at position 46 of CD44 . The Ina blood type results from a substitution proline for arginine at this same position.
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