Adhesion molecule that engages in homo- and heterophilic interactions with the other nectin-like family members, leading to cell aggregation. Important for synapse organization, providing regulated trans-synaptic adhesion. Preferentially binds to oligodendrocytes (By similarity). Found in the axoplasm of myelinated axons. Glycosylation at Asn-51 reduces adhesive binding. Belongs to the nectin family.