Promotes adhesion of endothelial cells through interaction with the alpha-v/beta-3 integrin receptor. Inhibits formation of vascular-like structures. May be involved in regulation of vascular morphogenesis of remodeling in embryonic development. EGF2 and EGF3 form a rigid rod via an interdomain calcium ion binding site, while the long linker between EGF1 and EGF2 lends considerable flexibility to EGF1.