#amnion__amniotic_sac__amnios  thin innermost membranous sac enclosing the developing embryo in higher vertebrates (Amniota: reptiles; birds; mammals)
  supertype:  #sac  a structure resembling a bag in an animal
  part of:  #fetal_membrane__fetalmembrane  any membrane that functions for the protection or nourishment of respiration or excretion of a developing fetus

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