ABO blood types are determined by the presence or absence of

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ABO blood types are determined by the presence or absence of agglutinogens on the surface of erythrocytes. The two main agglutinogens responsible for the four blood types are A and B. Individuals who have type A blood have A agglutinogens, those who have type B blood have B agglutinogens, those who have type AB blood have both A and B agglutinogens, and those who have type O blood have neither A nor B agglutinogens.

ABO Blood Types Are Determined by the Presence or Absence