Putative Notch ligand involved in the mediation of Notch signaling. May have a role in neurogenesis in the peripheral nervous system, limb development and in the adult brain. At stage E12.5 it is detected in dorsal root ganglia, AER, and surface ectoderm. At E14.5, found as well in cranial ganglia, thymus and olfactory epithelia. At E16.5, found as well in salivary gland, tooth buds and hair follicles.