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Endothelial tip cells are characterized by their position at the very tip of angiogenic
sprouts and by their extensive filopodia protrusions directed towards attractive angiogenic cues. In the developing mouse retina, tip cells are further distinguished from stalk cells by  higher  levels  of  transcripts  for  certain  genes  including  vascular  endothelial  growth factor  (VEGF)  receptor  (VEGFR)  2  and  near  selective  expression  of  other  genes  like platelet derived growth factor B
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