Blood samples were collected from CML patients at chronic phase in Zhongda Hospital Southeast University, Nanjing, China. Leukopheresis samples were underway for CD34+ cells separation with CliniMACS (Miltenyi Biotech, Germany). CD34+ cells were selected by using anti-CD34 magnetic beads in a magnetic activated cell sorter system (Miltenyi Biotec). All subjects signed an informed consent form. The procedure of cell collection from patients conformed to guidelines in the Declaration of Helsinki, and was approved by the Institutional Review Board of Zhongda Hospital Southeast University.
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