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Technician removing cow eggs from a petri dish

Technician removing cow eggs from a petri dish

G285/0033

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Credit

GEOFF TOMPKINSON / SCIENCE PHOTO LIBRARY GEOFF TOMPKINSON / SCIENCE PHOTO LIBRARY

Caption

Animal biotechnology. Embryologist removing cow ovarian follicles from a petri dish as part of an in vitro fertilisation (IVF) technique. Each of these cow follicles contain a single immature egg or oocyte. The oocytes are placed in a special fluid medium and then fertilised by sperm. After fertilisation, the resulting embryo is placed in a culture until it reaches the blastocyst stage which contains about 100 cells. The blastocyst is placed in the womb (uterus) of a cow, where it implants to cause a pregnancy. This technique is used with a number of species for spreading favourable genes.

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