The sense of smell is triggered by receptors in the olfactory epithelium that lines the nose. In mice at least, that lining is also responsible for receiving chemosensory cues involved in mating and other social behaviours.
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Ngai, J. An extra dimension to olfaction. Nature 442, 637–638 (2006). https://doi.org/10.1038/nature05001
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DOI: https://doi.org/10.1038/nature05001
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