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Stages of Embryo Development

by T Timothy Smith, PhD

Zygote: Fertilized egg (about 20 hours after insemination)

2 cell embryo (about 20 hours after insemination)

4 cell embryo (about 48 hours after insemination)

8 cell embryo (about 72 hours after insemination)

Morula: 16-32 cell embryo (about 96 hours after insemination)

Blastocyst stage embryo (about 115 hours after insemination)

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