Enables Notch binding activity. Involved in several processes, including blood vessel remodeling; circulatory system development; and regulation of Notch signaling pathway. Acts upstream of or within several processes, including Notch signaling pathway; angiogenesis; and negative regulation of blood
vessel endothelial cell migration. Predicted to be active in plasma membrane. Is expressed in several structures, including cardiovascular system; central nervous system; early conceptus; intestine; and retina. Used to study Adams-Oliver syndrome. Human ortholog(s) of this gene implicated in Adams-Oliver syndrome and limb ischemia. Orthologous to human DLL4 (delta like canonical Notch ligand 4). [provided by Alliance of Genome Resources, Apr 2025]