Plays a role in somitogenesis. Required for somite segregation and establishment of rostrocaudal polarity in somites (By similarity). First expressed in the paraxial mesoderm at the 90% epiboly stage, and subsequently confined to the presomitic mesoderm. Expressed in the rostral compartment of S-I and S-II. The ripply homology domain is required for transcriptional repression. The WRPW motif is required for binding to tle/groucho proteins. Belongs to the ripply family.