Control labeling for GLYT2 mRNA and GAD67 mRNA. Shown are photomicrographs of labeling in 50 μm sections at the level of the trapezoid nucleus for GLYT2 mRNA (a1, a2) and in sections of the cerebellar cortex for GAD67 mRNA (b1, b2). Also shown are antisense riboprobe (a1, b1) and sense riboprobe (a2, b2). Scale bars, 200 μm.