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The hematopoietic progenitors are a pool of cells which share the expression of a membrane glycoprotein: CD34. These cells are present in low frequencies in umbilical cord blood, adult peripheral blood and bone marrow (respectively, 0.1-0.6%, 0.01-0.1% and 0.8-4% of nucleated cells). The suitability of high-affinity monoclonal antibodies against the CD34 molecule, the necessity of rapid, sterile isolation methods and the chance of CD34-negative cell tumor purging in autologous stem celldoi:10.1351/pac199668101897 fatcat:fbxa7emf6vfadieetp6vmppyjq