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A MAR‐like antibody in a DCWe/DCWe person

BACKGROUND: MAR (RH51), a high‐incidence antigen in the Rh blood group system, is absent from RBCs with a double dose of CW or CX or a single dose each of CW and CX antigens, as well as from rare Rh phenotypes including D–– and Rhnull. The MAR antigen is associated with the presence of Ala36 and Gln41 on the RhCe protein. The original example of anti‐MAR, described in 1994, was made by a DCWe/DCXe woman. It was possible that the antibody directed against a high‐incidence antigen in the Rh system made by a DCXe/DCXe woman (CM) in 1983 was anti‐MAR.