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Additional
gastrula
English Wikipedia - The Free Encyclopedia
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Gastrulation
Gastrulation
is a phase early in the
embryonic development
of most
animals
, during which the single-layered
blastula
is reorganized into a trilaminar ("three-layered") structure known as the
gastrula
. These three
germ layers
are known as the
ectoderm
,
mesoderm
, and
endoderm
.
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