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Caption: Fertilisation. Light micrograph of a human egg cell surrounded by spermatozoa (sperm) prior to fertilisation. Only one sperm will succeed in penetrating the egg. Its genetic material will fuse with that of the egg, creating a zygote with the full 46 human chromosomes, 23 from each parent. Around the egg is the thick zona pellucida layer. Photographed at Cochin Hospital, Paris, France. Magnification unknown.

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Keywords: anatomy, egg, egg and sperm, fertilisation, fertilization, human body, light micrograph, reproduction, sperm, spermatozoa

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