Two-cell embryo

Two-cell embryo

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Credit: EDELMANN/SCIENCE PHOTO LIBRARY

Caption: Light micrograph of a human zygote (the primitive embryo) in the process of its first mitotic division - the first stage in a transformation from a single cell organism to one composed of millions of cells. The two cells formed (called blastomeres) both undergo similar cleavage; successive divisions result in the formation of a hollow ball of cells (the blastocyst) with a localised thickening (the inner cell mass) that will develop into the actual embryo. Development of the blastocyst occurs before it implants into the uterine wall. The site of implantation in the womb determines the subsequent position of the placenta.

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Keywords: 2-cell stage, biological, biology, blastomere, development, developmental, embryo, embryogenesis, embryology, embryonic, healthy, human body, human embryo, light micrograph, no-one, nobody, normal, reproduction

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