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Caption: Fertilisation. Computer artwork of one of a group of human sperm (spermatozoa) penetrating an egg (ovum). Only one sperm can penetrate the egg's thick outer layer (zona pellucida) and fertilise it. Fertilisation occurs when DNA (deoxyribo- nucleic 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, located in one of the Fallopian tubes.

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Keywords: anatomy, artwork, cells, egg, female, fertilisation, fertilising, fertilization, fertilizing, gamete, gametes, germ cell, human body, illustration, male, many, moving, multiple, ovum, penetrating, propelling, reproduction, reproductive system, sex cell, sexual reproduction, sperm, spermatozoa, spermatozoon, swimming, tail, tails, zona pellucida

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