Axon-associated cell adhesion molecule (AxCAM) which promotes neurite outgrowth by interaction with the AxCAM L1 (G4) of neuritic membrane. Contributes to the organization of axonal domains at nodes of Ranvier (By similarity). Attached to the neuronal membrane by a GPI-anchor. The N-terminus is blocked. Belongs to the immunoglobulin superfamily. Contactin family.