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Background Bone marrow derived-mesenchymal stem cells (BM-MSCs) in the marrow stroma provide a framework of microenvironment niches and release chemokines to modulate hematopoiesis in vivo.Chemokine stromal cell-derived factor-1 (SDF-1) and its receptor CXCR4 have been shown to affect the engraftment of hematopoietic stem cells.