الفهرس 
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Abstract
Endothelial progenitor cells (EPCs), described in 1997 by Asahara
et al .,constitute a heterogeneous population of circulating cells in
peripheral blood. Their origin is found in multipleprecursors, such as
hemangioblasts, non-hematopoietic precursors, monocytic cells, or tissue-resident stem cells. Endothelial progenitor cells play an important role in
vascular repair and new vessel formation, because of their capacity to
proliferate, migrate, differentiate in vivo and in vitrointo endothelial
cells, and incorporate into the preexisting endothelium. Thus,
phenotypically, they have morphofunctional characteristics of both
hematopoietic and mature endothelial cells (Silva et al., 2012) .
The study included 50 samples of human umbilical cord blood
(hUCB) collected from women during normal labor andafter taken their
informed consent at the Obstetric and Gynecology Department Faculty of
Medicine, Cairo University. The work up of the endothelial progenitor
cells was performed at the Unit of Biochemistry andMolecular Biology
at The Medical Biochemistry Department, Faculty of Medicine, Cairo
University