GUNILLA ELAM / SCIENCE PHOTO LIBRARY GUNILLA ELAM / SCIENCE PHOTO LIBRARY
Four-cell embryo. Computer artwork of an embryo about 40 hours after fertilisation. The fertilised egg, known as a zygote, has undergone two mitotic divisions to form four cells. The cells are known as blastomeres and will continue to divide, before implanting in the wall of the uterus (womb), where the embryo will continue to develop into a foetus.
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