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Abstract. Bone marrow stromal cells are believed to play a major role in bone formation as a major source of osteoprogenitor cells, however, very little is known about how the osteogenic differentiation of these cells is regulated by systemic hormones and local growth factors. We examined the effects of TGF- and its interaction with 1,25(OH)2 Vitamin D3 [1,25(OH)2D3] on the differentiation and proliferation...