Blood group B gene is barely expressed in in vitro erythroid culture of Bm-derived CD34+ cells without an erythroid cell-specific regulatory element

Background and Objectives Previously, a weak phenotype Am or Bm was assumed to be caused by a reduction of A or B gene expression in bone marrow cells, but not in mucus‐secreting cells. However, ABO expression has not been examined in erythroid progenitor cells of Am or Bm individuals. Materials and...

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