1) Biological process 2) Organic process
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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. Gastrulation takes place after cleavage and the formation of the blastu.....
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http://en.wikipedia.org/wiki/Gastrulation
• (n.) The process of invagination, in embryonic development, by which a gastrula is formed.
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http://thinkexist.com/dictionary/meaning/gastrulation/
(from the article `development`) After several divisions, the animal embryo forms a hollow ball called a blastula, which differentiates into three types of cells (ectoderm, mesoderm, ... ...be seen microscopically or by any other available means of analysis. The most dramatic and influential example of this was provided by studies on .....
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http://www.britannica.com/eb/a-z/g/12
The formation of a gastrula from a blastula. Gastrulation is a phase in the embryonic development of most animals. It consists of a complex and coordinated series of cellular movements which occurs at the end of cleavage. The details of these movements vary among species, but usually result in the f...
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http://www.daviddarling.info/encyclopedia/G/gastrulation.html
<embryology> During embryonic development of most animals a complex and co-ordinated series of cellular movements occurs at the end of cleavage. The details of these movements, gastrulation, vary from species to species, but usually result in the formation of the three primary germ layers, ectoderm, mesoderm and endoderm. ... (18 Nov 1997) .....
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http://www.encyclo.co.uk/local/20973
(gas″troo-la´shәn) the process by which a blastula becomes a gastrula or, in forms without a true blastula, the process by which three germ cell layers are acquired. In humans, it denotes the conversion of the bilaminar embryonic disc into a trilaminar embryonic disc as cells migrate through the primitive st...
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http://www.encyclo.co.uk/local/21001
During embryonic development of most animals a complex and coordinated series of cellular movements occurs at the end of cleavage. The details of these movements, gastrulation, vary from species to species, but usually result in the formation of the three primary germ layers, ectoderm, mesoderm and endoderm.
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http://www.encyclo.co.uk/visitor-contributions.php
Gas`tru·la'tion (găs`tru*lā'shŭn)
noun (Biol.) The process of invagination, in embryonic development, by which a gastrula is formed.
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http://www.encyclo.co.uk/webster/G/13
Type: Term Pronunciation: gas′trū-lā′shŭn Definitions: 1. Transformation of the blastula or blastocyst into the gastrula; the development and invagination of the embryonic germ layers. In human embryos, gastrulation is the process by which the bilaminar embryonic disk is converted into a trilaminar embryonic disk. &...
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http://www.medilexicon.com/medicaldictionary.php?t=36517
In embryology, gastrulation is the term used to describe the process in which a gastrula is formed from a blastula by the inward migration of cells.
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http://www.probertencyclopaedia.com/browse/EG.HTM
[
n] - the process in which a gastrula develops from a blastula by the inward migration of cells
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http://www.webdictionary.co.uk/definition.php?query=gastrulation
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