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The page below is a sample from the LabCE course Introduction to the ABO Blood Group System. Access the complete course and earn ASCLS P.A.C.E.-approved continuing education credits by subscribing online.

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Deducing the Gene

The presence of A and/or B antigen on the red cells can be recognized by serological tests with the appropriate antisera so that the presence of the gene that controls its production can be deduced in the absence of both A and B genes (when no A or B antigen is present on the red cells).