 CRMP-3 mRNA is only expressed in the granular layer of the cerebellum, inferior olive, and dentate gyrus of the hippocampus.CRMP-4 is the least expressed protein of CRMP family and its expression is restricted to the olfactory bulb, hippocampus, and the internal granule layer (IGL) of the cerebellum.Lastly, CRMP-5 is expressed not only in post-mitotic neurons of the olfactory bulb, olfactory epithelium, and dentate gyrus of the hippocampus, but also in peripheral nerve axons and sensory neurons.