Article
Loss of Egg Yolk Genes in Mammals and the Origin of Lactation and Placentation
14 Mar 2008
Abstract excerpt
Embryonic development in nonmammalian vertebrates depends entirely on nutritional reserves that are predominantly derived from vitellogenin proteins and stored in egg yolk. Mammals have evolved new resources, such as lactation and placentation, to nourish their developing and early offspring. However, the evolutionary timing and molecular events associated with this major phenotypic transition are not known. By...
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