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As the cells of the early embryo specialize, they soon differentiate into: (1) central ones that will form the embryo or fetus itself; and (2) peripheral ones (the trophoblast) that will be responsible for invading the mother’s tissues (see implantation) and will form the placenta and the membranes. See also cytotrophoblast, syncytiotrophoblast and extravillous trophoblast
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