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The Numbers of Zygotes and Embryos Analyzed at Different Developmental Stages
| Stage/type | Zygote/one-cell | Two-cell | Four-cell | Eight-cell/morula | Early blastocyst | Late blastocyst |
|---|---|---|---|---|---|---|
| IV | 9 | 5 | 5 | 2 | 3 | 3 |
| IVF | 10 | 5 | 5 | 5 | 3 | 2 |
| PA | 9 | 5 | 7 | 3 | 5 | 5 |
| SCNT | 7 | 5 | 4 | 3 | 5 | 5 |
IV, in vivo developed; IVF, in vitro fertilized; PA, parthenogenetically activated; SCNT, somatic cell nuclear transfer.
