Choriogenesis

In developmental biology, choriogenesis is the formation of the chorion, an outer membrane of the placenta that eventually forms chorionic villi that allow the transfer of blood and nutrients from mother to fetus. == Influence on monozygotic twins == Identical twins have identical genomes in the immediate aftermath of twinning. Two-thirds of monoz...
Found on http://en.wikipedia.org/wiki/Choriogenesis

choriogenesis

(kor″e-o-jen┬┤ә-sis) the development of the chorion.
Found on http://www.encyclo.co.uk/local/21001
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