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[[File:Glossary Icon-2.png|100px|frameless|right|link=ICRP Glossary]]
Early phase in the embryonic development of most animals, during which the single-layered blastula is re-organised into a three-layered gastrula comprising the ectoderm, mesoderm, and endoderm.
(from [[ICRP Publication 131]], 2015)
'''Return to [[ICRP Glossary|Glossary]]'''
Early phase in the embryonic development of most animals, during which the single-layered blastula is re-organised into a three-layered gastrula comprising the ectoderm, mesoderm, and endoderm.
(from [[ICRP Publication 131]], 2015)
'''Return to [[ICRP Glossary|Glossary]]'''