Four-cell embryo, illustration

Four-cell embryo, illustration

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Credit: RUSSELL KIGHTLEY/SCIENCE PHOTO LIBRARY

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Caption: Embryo development. Computer artwork of a fertilised egg cell which has divided twice to form four cells. After fertilisation the nuclei of the sperm cell and the egg fuse forming a zygote. The zygote then undergoes repeated mitosis (cell division), occurring approximately every twenty hours, to form a cluster of cells known as a morula, which continues to divide and develops into a blastocyst, and subsequently the embryo.

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