ANNOTATIONS

A zygote

Pronuclear Meeting

First Mitosis

2 cell embryo

4 cell embryo

6 cell embryo

8 cell embryo

"Comma" - stage embryo

"Twofold" - stage embryo

"Threefold" -stage embryo

"Pretzel" - stage embryo

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The reason for the jump from the "8 cell embryo" to "comma-stage embryo" frame is that it is difficult to observe how many cells an embryo possesses after the 8 cell stage. (Click on the links that interests you to see its annotation)