ANDY WALKER, MIDLAND FERTILITY SERVICES / SCIENCE PHOTO LIBRARY ANDY WALKER, MIDLAND FERTILITY SERVICES / SCIENCE PHOTO LIBRARY
Light micrograph of an immature human oocyte (the female egg cell) containing a germinal body, the large cell nucleus. Oocytes are formed in the ovaries and undergo two meiotic divisions before attaining maturity. Primary oocytes develop in the fetal ovary; further development is arrested at birth & completion of the first meiotic division suspended until after sexual maturity. Fertilisation stimulates the completion of the second meiotic division with the formation of a mature ovum. Magnification: x385 when printed at 10 centimetres wide.
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