Sections through the crista ampullaris (A, B) of the rat and the vestibular ganglion of the guinea pig (C). A, Section hybridized with DIG-labeled δ2 antisense riboprobe. Only background is observed. B, C, Sections hybridized with DIG-labeled δ1 antisense riboprobe. InB, type I (arrowheads) and type II (arrows) vestibular hair cells showed an intense hybridization signal. In C, most of the ganglion neurons are intensely labeled. Scale bar, 50 μm.