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Loss of Egg Yolk Genes in Mammals and the Origin of Lactation and Placentation

Caption: The emergence of alternative nourishment resources (lactation and placentation) during mammalian evolution set the stage for mammals' progressive loss of egg yolk nourishment (as a consequence of the loss of egg yolk genes).

Credit: Image: Rasmus Kaessmann

Usage Restrictions: Attribution must be given to the photographer, Rasmus Kaessmann.

Related news release: Loss of egg yolk genes in mammals and the origin of lactation and placentation

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