Physiological aspects of placental ontogeny and phylogeny.
D000818:Animals; D002454:Cell Differentiation; D002463:Cell Membrane Permeability; D005314:Embryonic and Fetal Development; D005260:Female; D006801:Humans; D008431:Maternal-Fetal Exchange; D010920:Placenta / Q000502:physiology*; D011247:Pregnancy