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Answer for the clue "The process in which a gastrula develops from a blastula by the inward migration of cells ", 12 letters:
gastrulation

Word definitions for gastrulation in dictionaries

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Gastrulation \Gas`tru*la"tion\ (g[a^]s`tr[.u]*l[=a]"sh[u^]n), n. (Biol.) The process of invagination, in embryonic development, by which a gastrula is formed.

WordNet Word definitions in WordNet
n. the process in which a gastrula develops from a blastula by the inward migration of cells

Wiktionary Word definitions in Wiktionary
n. (context embryology biology English) The stage of embryo development at which a gastrula is formed from the blastula by the inward migration of cells

Wikipedia Word definitions in Wikipedia
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 ...