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EMBRYONIC DEVELOPMENT & STEM CELL COMPENDIUM
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All in Vivo Cells > Cell Card
Zygote
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Zygote
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4-Cell Embryo (Zgt)


Zgt.Zgt.4CE
The 4-cell embryo is the result of a second cleavage event, and occurs at approximately 40 hours after fertilization. The individual cells are called blastomeres. At this stage, the process of embryonic genome activation is initiated in human embryos, and lasts until the 8-cell stage. The resulting morula stage marks the first morphological indication of a break in radial symmetry.  
CS2 - CS2
Blastomeres
4-Cell Embryo
Multiple Ancestors Single Ancestor No Descendants Develops from Part of Parent