Definition of ABO system

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< abortive

aboulia >

ABO system

(

) KEY

NOUN:

A classification system for human blood that identifies four major blood types based on the presence or absence of two antigens, A and B, on red blood cells. The four blood types (A, B, AB, and O, in which O designates blood that lacks both antigens) are important in determining the compatibility of blood for transfusion.

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