May play a role in early neuronal differentiation and axon outgrowth. Expressed by all neurogenic cells early, but only those cells that become neuroblasts continue to express it. Expressed by neuroblasts, ganglion mother cells and neurons early in their lives, but expression becomes restricted to a subset of neurons as development progresses. Expressed by sensory neurons as they delaminate from the body wall ectoderm. It is also present on growing axons of the CNS and PNS and becomes restricted to a subset of axons later in development. Expressed on differentiating neuronal cells from the onset of neurogenesis in both the central and peripheral nervous systems. The N-terminus is blocked.