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The emergence of the first adult hematopoietic stem cells (HSCs) during mammalian ontogeny has been under intense investigation. It is as yet unresolved whether these first HSCs are derived from intraembryonic hemangioblasts, hemogenic endothelial cells, or other progenitors. Thus, to examine the spatial generation of functional HSCs within the mouse embryo, we used the well-known HSC marker, Sca-1,...
The AML1:CBFβ transcription factor complex is essential for definitive hematopoiesis. Null mutations in mouse AML1 result in midgestational lethality with a complete lack of fetal liver hematopoiesis. While the cell autonomous nature and expression pattern of AML1 suggest an intrinsic role for this transcription factor in the developing hematopoietic system, no direct link to a functional cell type...
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