Fig. 12.
Reproduced with permission of the authors from Drake et al. (2000). (a) Control, showing untreated endothelial cells’ formation of a normal capillary plexus. (c) Injecting soluble VEGFR-1 into chick embryos blocks VEGF-signaling, causing clusters of rounded, vascular progenitor cells to form. (b, d) Stained nuclei of vascular progenitor cells. Scale bar, 15 μm.
