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Fertilization

Fertilization

P648/0172

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Credit

ANIMATED HEALTHCARE LTD / SCIENCE PHOTO LIBRARY ANIMATED HEALTHCARE LTD / SCIENCE PHOTO LIBRARY

Caption

Fertilization. Computer artwork of one of a group of human sperm (spermatozoa) successfully penetrating an egg (ovum). Only one sperm can penetrate the egg's thick outer layer (zona pellucida) and fertilize it. Fertilization occurs when DNA (deoxyribonucleic acid) released by the sperm fuses with DNA contained in the egg. Women produce a single egg at a time, whilst men release around 500 million sperm. The sperm use their flexible tails to travel through the female reproductive tract. Only a few thousand sperm reach the egg, which is located in one of the Fallopian tubes.

Release details

Model release not required. Property release not required.

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