- A process involved in gastrulation of telolecithal eggs in which, as a result of differential growth, some of the cells of the protoderm move over the surface toward the lips of the blastopore.
- Growth of epithelium in an organ culture to surround the underlying mesenchymal tissue.
[G. epibolē, a throwing or laying on]
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Examples: glitazone, GI cocktail, etc.