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Lewandowski

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In the embryo, new vessels form de novo via the assembly of mesoderm-derived endothelial precursors (angioblasts) thatdifferentiate into a primitive vascular labyrinth (vasculogenesis). Subsequent vessel sprouting (angiogenesis) creates a network that remodels into arteries and veins. Recruitment of pericytes and vascular smooth muscle cells that enwrap nascent EC tubules provides stability and regulates perfusion. In the adult, vessels are quiescent and rarely form new branches. However, ECs retain high plasticity to sense and respond to angiogenic signals.

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Lewandowski

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2Â¥: Originally posted by andrewzhang at 2013-07-17 15:31:13
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