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During murine embryonic development, the first hematopoietic stem cells (HSCs) emerge within the major arterial vasculature, including the aorta-gonad-mesonephros (AGM) region. Throughout their emergence and subsequent maturation, HSCs retain a close physical association with the surrounding endothelial cell layer, suggesting that signaling interactions between HSC and the surrounding vascular niche may play an integral role in HSC development. Indeed, we have previously shown that co-culturedoi:10.21203/rs.3.pex-986/v1 fatcat:fn5te424oze4fomqispqruxsce