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Multi-celled embryo, light micrograph

Multi-celled embryo, light micrograph

P680/0953

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Credit

DR NAJEEB LAYYOUS / SCIENCE PHOTO LIBRARY DR NAJEEB LAYYOUS / SCIENCE PHOTO LIBRARY

Caption

Multi-celled embryo. Light micrograph of an embryo, showing 8 cells. The development of an embryo is called embryogenesis. In organisms that reproduce sexually, once a sperm fertilizes an egg cell the result is a cell that has all the DNA (deoxyribonucleic acid) of the two parents (zygote). The zygote begins to divide by mitosis producing 2, 4, 8 cells and so on, to form a multicellular organism. The zygote is called an embryo from the first cell division, up until the end of the 8th week. At this stage of 8 cells, it is typically around 80 to 100 micrometres across. Magnification: x530 when printed at 10 centimetres across.

Release details

Model release not required. Property release not required.

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