A review, with 26 references Neurite-neurite interactions in the vertebrate nervous system are most likely mediated by several distinct cell surface components. Glycoproteins identified to date that have this function include the L1-related group of antigens (mouse L1, rate NILE, chick NgCAM, chick G4, chick 8 D 9, human 5 G 3) chick F11, chick neurofascin, and perhaps NCAM.