Ligand for members of the frizzled family of seven transmembrane receptors (Probable). Plays an important role in embryonic development (By similarity). Interacts with CPZ. Predominantly expressed in the diencephalon neuromere D2. Palmitoleoylation is required for efficient binding to frizzled receptors. Depalmitoleoylation leads to Wnt signaling pathway inhibition. Belongs to the Wnt family.