At the moment of ____, the fertilised ____ (zygote) is only made up of a ____ cell. This cell does not yet have a job - it is ____. As the ____ divides to form new cells, it turns into a hollow ____ of cells that is called an ____. The cells inside this are embryonic ____ cells that can differentiate to form ____ other type of ____ cell.

Embryonic Stem Cells

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