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The growth of a rapidly dividing group of cells around a more slowly dividing group of cells, as in the formation of a gastrula.

[Greek epibolē, a throwing or laying on, from epiballein, to throw on : epi-, epi- + ballein, to throw; see gwelə- in Indo-European roots.]

ep′i·bol′ic (ĕp′ə-bŏl′ĭk) adj.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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In a recent study, knockdown of CFL1 in zebrafish interferes with the epibolic movement of the deep cell layer but not in the enveloping layer, and the defect can be specifically rescued by the overexpression of CFL1, suggesting an effective role for this gene in adhesion and cell movements (26).
amazonicus oocytes due to enzymes and proteins that participate in the formation and performance of microtubules and the direction of epibolic movements.
This could be explained by a partial lack of epibolic displacement accounted for a decreased number of blastodermic cells available at the time of gastrulation.