PASCAL GOETGHELUCK / SCIENCE PHOTO LIBRARY PASCAL GOETGHELUCK / SCIENCE PHOTO LIBRARY
Human egg. Light micrograph of a human secondary oocyte (mature egg), with its first polar body (oval, centre right). Before ovulation the egg undergoes meiotic division to create two cells: a secondary oocyte and a polar body. The polar body will degenerate, while the larger egg develops in preparation for fertilisation. Around the egg is the zona pellucida layer. Photographed at Cochin Hospital, Paris, France. Magnification unknown.
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