Pseudocolor images of L1 immunoreactive structures in the forebrain and upper brainstem Pseudocolors were as shown in Fig. 4. The cytoarchitecture in the same areas of neighboring sections is presented on the right side as mirror images (a-i). The asterisk that appears in (i) shows a false positive that occurred in areas damaged by tissue processing. Abbreviations are given in the list of abbreviations used. Bar = 1 mm.