The occurrence of weak D antigens (Du) of the Rh system in blood donors.
D000941:Antigens / Q000032:analysis*; D001782:Blood Donors; D005787:Gene Frequency; D006801:Humans; D010641:Phenotype; D012204:Rh-Hr Blood-Group System / Q000032:analysis*
D000941:Antigens; D012204:Rh-Hr Blood-Group System