Embryogenesis of the first circulating endothelial cells.
Prior to this study, the earliest appearance of circulating endothelial cells in warm-blooded animals was unknown.Time-lapse imaging of germ-line transformed Tie1-YFP reporter quail embryos combined with the endothelial marker antibody QH1 provides definitive evidence for the existence 5326058hx of circulating endothelial cells - from the very begi