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The zygote: first stage of embryo development after fertilization
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The zygote: first stage of embryo development after fertilization

The zygote appears from the fusion between the egg and sperm. The zygote is formed by only one cell and the cores of the egg and sperm can be observed in its centre.

By BSc, MSc (embryologist), BSc, MSc (embryologist) and BA, MA (fertility counselor).
Last Update: 02/02/2017