... NRP1. These olfactory receptor subclasses are evenly distributed within the olfactory epithelium, and their axons (olfactory axons) are initially intermingledwith each other. However, the NRP-predominant ... NEUROPILINFirst, the expression of NRP is limited to particular classes of neurons. Mostperipheral sensory and autonomic ganglia, motor neuron pools in the spinal cord and the motor nuclei in the medulla, ... NRP-predominant and the Plex-predominant olfac-tory axon subclasses become gradually segregated throughout their courses from the nose to the cerebrum, and eventually become completely separated and projectto...