blastula :

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  • n  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

  • Retrieved from his place at a Washington committee meeting was a matchless example of the rose-o window work of the painstaking blastula school, with the later or packing-box .
  • More and more cells are formed, until there is a group of some 500 cells, forming a fairly normal blastula (early embryonic form).

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