The Wnt signaling pathway is a complex protein-acting network whose function is most commonly seen in embryonic development and cancer, but is also involved in normal physiological processes in adult animals.  The Wnt signaling pathway is a set of multi-downstream signal transduction pathways stimulated by the binding of ligand protein Wnt to membrane protein receptor. Through this pathway, extracellular signals are transmitted into the cell by activation of intracellular segments of receptors on the cell surface.
The Wnt signaling pathway presents two signaling pathways between cells: intercellular communication (paracrine) or autologous communication (autocrine). The Wnt signaling pathway is highly genetically conserved in animals and is very similar across animal species.