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α‐Gustducin expression in the vomeronasal organ of the mouse

The expression of α‐gustducin, a G protein α subunit involved in bitter and sweet taste transduction, was investigated in chemosensory tissues of adult mice. By immunohistochemistry, α gustducin was absent in the olfactory neuroepithelium. Instead, α gustducin was expressed in a subset of bipolar cells in the proliferative zone of the vomeronasal neuroepithelium as well as in taste buds. Northern blot analysis confirmed the presence of α gustducin in isolated vomeronasal organs. Moreover, immunohisto‐ chemistry revealed the expression of α gustducin in scattered cells of the nasal respiratory epithelium. These results show for the first time that α gustducin is expressed in chemosensory tissue outside the alimentary tract, suggesting that common transduction mechanisms could be shared by apparently unrelated chemosensory tissues.