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Chorion
For the chorion in
vertebrate
egg
s, see
Chorion (egg)
.
For the entertainment company see
Chorion (company)
.
In humans and most mammals, the
chorion
is one of the
membranes
that exist during pregnancy between the developing
fetus
and mother (the
fetal membranes
). The chorion and the
amnion
together form the
amniotic sac
.
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