Ligand for members of the frizzled family of seven transmembrane receptors. May play a role in the formation of dermal structure, both limb and feather buds. Is likely to signal over only few cell diameters. Expressed in the dermatome. The expression domain is mutually exclusive to the other Wnt genes. Expressed during embryogenesis. Palmitoleoylation is required for efficient binding to frizzled receptors. Depalmitoleoylation leads to Wnt signaling pathway inhibition. Belongs to the Wnt family.