Differential localization of G proteins in the opossum vomeronasal system.

Gi2 alpha and G(o) alpha proteins were immunohistochemically localized, respectively, to the rostral and caudal accessory olfactory bulb of Brazilian opossums. In the vomeronasal organ, Gi2 alpha- and G(o) alpha-immunoreactive neurons were located in the middle and basal layers, respectively, of the sensory epithelium. Both G protein antibodies stained the microvillar surface of the epithelium and the nerve bundles in the subepithelial mucosa.