This conserved region is found at the in the N-terminal half of several Spondin proteins. Spondins are involved in patterning axonal growth trajectory through either inhibiting or promoting adhesion of embryonic nerve cells ([1]).

1: F-spondin is a contact-repellent molecule for embryonic motor neurons. Tzarfati-Majar V, Burstyn-Cohen T, Klar A; Proc Natl Acad Sci U S A 2001;98:4722-4727. PMID:11287656