Member of the Wnt ligand gene family that encodes for secreted proteins, which activate the Wnt signaling cascade. Involved in neurogenesis. Performs a partially redundant function with wnt1 in the formation of the midbrain-hindbrain boundary (MHB) organizer. Palmitoleoylation is required for efficient binding to frizzled receptors. Depalmitoleoylation leads to Wnt signaling pathway inhibition. Belongs to the Wnt family.