tonofilament
Pronunciation: ton′ō-fil′ă-ment
Definition: A structural cytoplasmic protein, of a class known as intermediate filaments, bundles of which together form a tonofibril; a tonofilament is made up of a variable number of related proteins, keratins, and is found in all epithelial cells, but is particularly well developed in the epidermis.
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Examples: glitazone, GI cocktail, etc.

