虽然，有关人类造血干细胞的鉴定，目前还未找到直接鉴定的方法，但仍可从其表面的分子标记、集落形成情况等推断造血干细胞的存在。ＣＤ３４抗原表达于人类的造血祖细胞表面包括造血干细胞，因而是目前普遍用于估算造血干细胞含量的指标。然而骨髓大部分ＣＤ３４＋细胞除造血? Although human hematopoietic stem cells have not yet been identified for direct identification, hematopoietic stem cells can still be inferred from their surface molecular markers and colony formation. CD34 antigen expression on human hematopoietic progenitor cells including hematopoietic stem cells, and therefore is currently used to estimate hematopoietic stem cell content indicators. However, most of the bone marrow CD34 + cells in addition to hematopoietic?