Figure 2.

In situ distribution of sodium channel subunits in adult rat brain. X-ray autoradiographs of separate sagittal sections of rat brain (taken from the same animal) showing the distribution of rat αIIA (a–c), rat β1 (d–f), and rat β3 (g–i) mRNA transcripts as revealed by in situ hybridization with specific oligonucleotide probes. Control reactions with 100-fold excess unlabeled probes are shown for αIIA (c), β1 (f), and β3 (i). Slides were exposed to x-ray film for 10 days. Dark areas indicate high expression levels. Cb, cerebellum; Ctx, cortex; CP, caudate putamen.