Predicted to enable calcium ion binding activity. Involved in negative regulation of fat cell differentiation and negative regulation of vascular endothelial cell proliferation. Acts upstream of or within several processes, including bone mineralization; negative regulation of Notch signaling pathway; and positive regulation of bone resorption. Located in external side of plasma membrane. Is expressed in several structures, including alimentary system; branchial arch; embryo mesenchyme; genitourinary system; and nervous system. Orthologous to human DLK1 (delta like non-canonical Notch ligand 1). [provided by Alliance of Genome Resources, Apr 2022]