CGA expression in GABAergic regions of mouse brain. GABAergic neurons of the reticular thalamic nucleus (rTh) show stronger immunostaining than the glutamatergic neurons of the ventral posterolateral thalamic nucleus (VPL) (A). Bar=50 μm. In the CA1 region of hippocampus, the glutamatergic neurons located in the pyramidal cell layer (pcl) exhibit only weak WE14 immunoreactivity (B). In contrast, presumed inhibitory (GABAergic) interneurons (arrow) scattered through all layers of CA1 show strong WE14 immunoreactivity. Bar=50 μm. In contrast to the caudate–putamen (CPu), the globus pallidus contains presumed GABAergic neurons with very strong WE14 immunoreactivity (C). Bar=25 μm. So, stratum oriens; pcl, pyramidal cell layer; sl, stratum lucidum; sr, stratum radiatum.