Neuritin/NRN1 is a member of the neuritin family and can be expressed in postmitotic-differentiating neurons of the developmental nervous system and neuronal structures associated with plasticity in the adult. Neuritin/NRN1 promotes neurite outgrowti1/4? arborization and neuritogenesis. The protein contains a consensus cleavage signal found in glycosylphoshatidylinositol (GPI)-anchored proteins.Overexpression of the encoded protein may be associated with astrocytoma progression.