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Background Nerve growth factor (NGF) is a potent growth factor that plays a key role in neuronal cell differentiation and may also play a role in hematopoietic differentiation. It has been shown that NGF induced synergistic action for the colony formation of CD34 positive hematopoietic progenitor cells treated with m acrophage-c olony s timulating f actor (M-CSF or CSF-1), or s tem c ell f actor (SCF)...