The Notch receptors are highly conserved from invertebrates to mammals.While Notch1 and Notch 2 exhibit the highest structural similarity among the four mammalian Notch receptors. Notch 3 has a number of structural and functional differences.The binding of Notch 3 to its ligands results in the proteolysis of Notch and movement of intracellular portions of Notch into the nucleus.This translocation triggers a series of signaling process.Notch 3 is primarily expressed in adult arterial smooth muscle cells.Notch 3 gene mutation can cause CADASIL, an inherited early stroke syndrome.