#blastula__blastodermic_vesicle  early stage of an embryo produced by cleavage of an ovum; a liquid-filled sphere whose wall is composed of a single layer of cells; during this stage (about eight days after fertilization) implantation in the wall of the uterus occurs
  supertype:  conceptus__conceptu__embryo__fertilized_egg  an animal organism in the early stages of growth and differentiation that in higher forms merge into fetal stages but in lower forms terminate in commencement of larval life
  part:  blastocoel
  subtype:  blastosphere__blastocyst  the blastula of mammals

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