Conclusion: Normal CD34+ cells have high level WT1 expression and rapidly decrease of its expression in early phase of cell differentiation is likely to be a necessary procedure in normal hemopoiesic stem cells differentiation process. 结论:正常CD34+细胞有较高水平的WT1表达,细胞分化早期WT1表达的迅速降低可能是正常造血细胞分化的必要环节;