Two-cell embryo

Two-cell embryo

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Credit: OMIKRON/SCIENCE PHOTO LIBRARY.

Caption: Light micrograph of the human ovum (egg) at the 2 cell stage (occurs about 60 hours after fertilisation). The fertilised ovum (the zygote) undergoes rapid mitotic cell divisions to form a ball of cells (the blastocyst). The individual cells (blastomeres) do not grow between divisions, & therefore decrease in size with successive divisions. In this image, the 2 nuclei (central bodies) are prominent in each daughter cell. Magnification X 1000 at 35mm size.

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Keywords: 2, anatomy, embryo, healthy, horizontal, human body, light micrograph, normal, prenatal, two celled

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