In order to further analyze the difference in Ig expression between myeloid cells at different stages of differentiation, myeloid cells were divided into two groups, including CD34+/CD14− AML progenitor cells (CD34+ myeloblasts, P4 gate) and relatively mature CD34−/CD14+ cells (monocytes) (Figure 7A, P5 gate). The gene discussed is CD34; the disease is acute myeloid leukemia.