
Hemangioblast are the multipotent precursor cells that can differentiate into both hematopoietic and endothelial cells. In the mouse embryo, the emergence of blood islands in the yolk sac at embryonic day 7 marks the onset of hematopoiesis. From these blood islands, the hematopoietic cells and vasculature are formed shortly after. Hemangioblasts a...
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http://en.wikipedia.org/wiki/Hemangioblast

Synonym for haemangioblast ... <haematology> Earliest mesodermal precursor of both blood and vascular endothelial cells. Described in embryonic yolk sac blood islands of birds. ... (18 Nov 1997) ...
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http://www.encyclo.co.uk/local/20973

(he-man´je-o-blast) a mesodermal cell that gives rise to both vascular endothelium and hemocytoblasts.
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http://www.encyclo.co.uk/local/21001

Type: Term Pronunciation: hē-man′jē-ō-blast Definitions: 1. A primordial embryonic cell of mesodermal origin producing cells from which vascular endothelium, reticuloendothelial elements, and blood-formin are cells of all types are derived.
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http://www.medilexicon.com/medicaldictionary.php?t=39714
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