Antigen Report: A9.3
During the Sixth International Histocompatibility Workshop, a third subset of A9 (A9.3) was described in Caucasians and African Blacks . However, A9.3 was no longer considered valid at the last two workshops [1, 3]. Gebuhrer et al.  recently described a variant of A9 that is distinct from A23 and A24 in an Arab family. This subtype is defined by positive reactions with two A9 (038, 039) and two A24 (047, 048) sera and negative reactions with all anti-A23, two anti-A24 (050, 051), and two A9 (036, 037) sera. They named this variant A9.3, although it is not certain that it corresponds to the subset defined in 1975 .
KeywordsLinkage Disequilibrium Blood Transfusion Positive Reaction Negative Reaction African Black
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