The olfactory receptor, or smell receptor, is a protein capable of binding odor molecules that play a central role in the sense of smell (olfaction). According to the SIRC, while a rabbit has 100 million of these olfactory receptors and a dog — 220 million, humans have only about 5 or 6 million of them. But this amount of them is enough to have quite a bit of control over our lives.
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