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To the Editor: Crosby et al1 noted in their report that the recruitment of bone marrow–derived endothelial progenitor cells to newly forming blood vessels might have been hitherto overlooked. Postulated already a century ago,2 there is now ample evidence for a close association between blood progenitor cells and angiogenesis3 and the existence of a hemangioblastic progenitor capable …

Contribution of Endothelial Cells of Hematopoietic Origin to Blood Vessel Formation