The difference between a mole and shrew is in their SOX

The family of small insectivores, Talpidae, includes the moles, shrew moles, and aquatic desmans. New research published in BioMed Central's open access journal EvoDevo has found that the enlargement of moles' digging front paws, compared to their feet, is controlled by altered timing of expression of the gene SOX9.

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