PROFESSORS P.M. MOTTA & S. MAKABE / SCIENCE PHOTO LIBRARY PROFESSORS P.M. MOTTA & S. MAKABE / SCIENCE PHOTO LIBRARY
Primordial egg cell in a human embryo. False- colour scanning electron micrograph of a primordial germ cell (green) surrounded by follicular cells (magenta). At this stage primordial germ cells, also known as oogonia, migrate from the yolk sac into the ovarian cortex where they multiply by mitosis. By the fourth and fifth months of foetal development the primordial germ cells number about seven million but of these only 1 million will be present at birth. By this stage they have become primordial follicles and will represent the patrimony of eggs in the woman's ovary. Magnification: x2240 at 6x7cm size.
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