Its role in signal transduction is supported by its localization in the caveoli (invaginated micro-domains of the plasma membrane involved in signal transduction).— Citizendium, the Citizens' Compendium - Recent changes [en]
Also, the secretory portions of glands and their ducts are formed from invaginated epithelial cells.
Yet, as he invaginated the trenchcoat, he became sheathed in a distinctly African-American persona of the cool hoochie-coochie bluesman.— Stories from The Sun
The inner layer or the invaginated part of the blastoderm, which immediately encloses the gut-cavity is the entoderm, the inner or vegetal germ-layer, from which develop the wall of the alimentary canal and all its appendages, the coelom-pouches, etc. (Figures 1.35 and 1.36 i).— The Evolution of Man — Volume 2
The outer stratum of cells, or the non-invaginated part of the blastoderm, is the ectoderm, the outer or animal germ-layer, which provides the outer skin (epidermis) and the nervous system (e).— The Evolution of Man — Volume 2

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