This report investigates the cytokine expression during osteogenic and stromal differentiation of human mesenchymal stem cells (MSCs) from bone marrow. Their conclusions: “Primary and osteogenic differentiated MSCs produce important hematopoietic cytokines and support hematopoiesis in long-term cultures, suggesting that these cells may provide an excellent ex vivo environment for hematopoiesis during progenitor cell expansion and may be important for in vivo cell therapy.”