Enables identical protein binding activity. Involved in regulation of fat cell differentiation. Acts upstream of or within negative regulation of Notch signaling pathway. Predicted to be located in membrane. Predicted to be integral component of membrane. Is expressed in several structures, including articular cartilage; foregut; limb mesenchyme; long bone; and nasal cavity respiratory epithelium. Orthologous to human DLK2 (delta like non-canonical Notch ligand 2). [provided by Alliance of Genome Resources, Apr 2022]