Pseudocolor images of L1 immunoreactive structures in the cerebellum, lower brainstem and upper cervical spinal cord. Pseudocolors were designated as red (highest), yellow (high), green (moderate), light blue (low), blue (lowest), and dark blue (none) in order of the density of brown oxidized DAB product. The real L1 densities of each pseudocolor were presented (right bottom). The cytoarchitecture in the same areas of neighboring sections is presented on the right side as mirror images (j-p q, q', r, r'). The asterisks show a false positive caused by damaged tissue. Bar = 1 mm.