Enables Notch binding activity and scaffold protein binding activity. Involved in several processes, including animal organ development; negative regulation of cell differentiation; and regionalization. Acts upstream of or within several processes, including anterior/posterior pattern specification; negative regulation of cell differentiation; and nephron tubule development. Located in several cellular components, including adherens junction; apical plasma membrane; and membrane raft. Is expressed in several structures, including alimentary system; central nervous system; limb; metanephros; and sensory organ. Orthologous to human DLL1 (delta like canonical Notch ligand 1). [provided by Alliance of Genome Resources, Apr 2022]