An oocyte at the time of Oocyte Retrieval.
  A fertilized oocyte showing 2 pronuclei, one maternal and one paternal.
  An 8-cell embryo on Day 3.
  A morula, showing compaction of the cells.
  A blastocyst.
  Blastocyst "hatching" from the zona pellucida (outer covering of the egg).
  Chemical digestion of the zona pellucida using Acidic Tyrodes Solution prior to Blastomere Biopsy.
  Removing one of the blastomeres for Preimplantation Genetic Diagnosis (PGD) for screening of chromosomal abnormalities.

 


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