Enables Notch binding activity. Acts upstream of or within negative regulation of cell migration and vasculogenesis. Located in extracellular space. Is expressed in several structures, including cardiovascular system; gonad; hemolymphoid system gland; retina layer; and yolk sac. Orthologous to human EGFL7 (EGF like domain multiple 7). [provided by Alliance of Genome Resources, Apr 2022]