Sense of smell is critical for survival in many mammals. In a new study, researchers examined the olfactory receptor repertoire encoded in 13 mammalian species and found that African elephants have the largest number of OR genes ever characterized; more than twice that found in dogs, and five times more than in humans.![](http://feeds.feedburner.com/~r/sciencedaily/plants_animals/dogs/~4/DgnV8zSZihE)
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22 de Julho de 2014
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