How mammary glands appeared in the course of evolution

kitten and chicksElements of the regulatory networks controlling Hox gene expression were hijacked, enabling some of these genes to be reused to form mammary buds, thus favouring the emergence of placental mammals and marsupials. This study, published during the week of November 14, 2016 in PNAS, was led by Leonardo Beccari, from the team of Denis Duboule.

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