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Terminology
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Egg (Oocyte) - The female reproductive cell. Embryo The term for a fertilized egg from the time of initial cell division through the first six to eight weeks of gestation. Thereafter, the embryo begins to differentiate and take on a human organic form; at this point it is traditionally referred to as a fetus.
Estrogens - The female sex hormones. First recognized around 1915, estrogen is responsible for the development of the secondary feminine sex characteristics, which include breasts, rounded hips, and pubic hair. Together with progesterone, another female hormone made by the ovaries, estrogen regulates the changes that occur with each monthly period and prepares the uterus for pregnancy.
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