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Ovulation. Image 5 of 5. Endoscope view of corpus luteum tissue (yellow) forming on an ovary (white, centre) after ovulation, the release of an egg (ovum, female reproductive cell) from an ovary. The corpus luteum tissue forms at the site where an ovarian follicle ruptured to release the egg (not seen). Luteal tissue is glandular, secreting the hormone progesterone to prepares the uterus (top left) for the implantation of a fertilised egg. If the implantation fails, the corpus luteum tissue degenerates. Otherwise, it continues to secrete progesterone until the fourth month of pregnancy. For a sequence of endoscope images of the stages of ovulation, see images P616/326-330.

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