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Epiblast
In
amniote
animal
embryology
, the
epiblast
is one of two distinct layers arising from the
inner cell mass
in the
mammalian
blastocyst
or from the
blastodisc
in
reptiles
and
birds
. It derives the embryo proper through its differentiation into the three primary germ layers,
ectoderm
,
mesoderm
and
endoderm
, during
gastrulation
. The amnionic ectoderm and extraembryonic mesoderm also originate from the epiblast.
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