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Text File  |  1992-09-03  |  227b  |  7 lines
  1. Early stage in the development of a
  2. fertilized egg, when the egg changes from a
  3. solid mass of cells (the morula) to a hollow
  4. ball of cells (the blastula), containing a
  5. fluid-filled cavity (the blastocoel). See
  6. also embryology.
  7.