evocation defined in 1951 yearevocation - evocation;
evocation - Induction in an embryonic tissue of a particular process of development, by a chemical substance (an evocator) diffusing from nearby tissue (or from an artificial implant). Best-known instance is evocation in vertebrates of neural development in ectoderm, as a result of diffusion of (an unknown) substance from under-lying chorda-mesoderm in gastrula stage. See also: Organizer.
near evocation in Knolik
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