PROFESSOR P.M. MOTTA ET AL / SCIENCE PHOTO LIBRARY PROFESSOR P.M. MOTTA ET AL / SCIENCE PHOTO LIBRARY
Mature oocyte. Coloured light micrograph of a human secondary oocyte (mature egg). At centre is the rounded egg (pink) as seen in the ovary before ovulation. The egg cell undergoes meiotic division giving rise to two cells: a secondary oocyte and a polar body (not seen). The polar body degenerates and has no function. Here, directly around the egg is the zona pellucida single layer of cells (unfocused); outside the zona pellucida are several layers of cells making up the corona radiata (yellow). These cells support and nourish the developing egg in the ovary. Magnification: x560 at 6x7cm size.
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